<PAGE>

                                                                     Exhibit 4.1


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                           RIVERSTONE NETWORKS, INC.

                                      and

                         MELLON INVESTOR SERVICES LLC,


                                as Rights Agent


                               _________________


                               Rights Agreement

                           Dated as of July 16, 2001



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<PAGE>

Table of Contents

<TABLE>
<CAPTION>
Section                                                                                                                         Page
--------                                                                                                                        ----
<S>                                                                                                                             <C>
Section 1.  Certain Definitions...............................................................................................     1
Section 2.  Appointment of Rights Agent.......................................................................................     6
Section 3.  Issue of Rights Certificates......................................................................................     6
Section 4.  Form of Rights Certificates.......................................................................................     8
Section 5.  Countersignature and Registration.................................................................................     9
Section 6.  Transfer, Split Up, Combination and Exchange of Rights Certificates; Mutilated, Destroyed, Lost or Stolen Rights
            Certificates......................................................................................................    10
Section 7.  Exercise of Rights; Purchase Price; Expiration Date of Rights.....................................................    11
Section 8.  Cancellation and Destruction of Rights Certificates...............................................................    13
Section 9.  Reservation and Availability of Shares of Preferred Stock; Other Covenants........................................    13
Section 10.  Preferred Stock Record Date; Etc.................................................................................    15
Section 11.  Antidilution Adjustments.........................................................................................    15
Section 12.  Certificate of Adjustments.......................................................................................    25
Section 13.  Consolidation, Merger or Sale or Transfer of Assets or Earning Power.............................................    25
Section 14.  Fractional Rights and Fractional Shares..........................................................................    27
Section 15.  Rights of Action.................................................................................................    28
Section 16.  Agreement of Rights Holders......................................................................................    29
Section 17.  Rights Certificate Holder Not Deemed a Stockholder...............................................................    29
Section 18.  Concerning the Rights Agent......................................................................................    30
Section 19.  Merger or Consolidation or Change of Name of Rights Agent........................................................    30
Section 20.  Rights and Duties of Rights Agent................................................................................    31
Section 21.  Change of Rights Agent...........................................................................................    34
Section 22.  Issuance of New Rights Certificates..............................................................................    35
Section 23.  Redemption and Termination.......................................................................................    35
Section 24.  Exchange.........................................................................................................    36
Section 25.  Notice of Proposed Actions.......................................................................................    37
Section 26.  Notices..........................................................................................................    38
Section 27.  Supplements and Amendments.......................................................................................    39
Section 28.  Successors.......................................................................................................    39
Section 29.  Determinations and Actions by the Board; etc.....................................................................    40
Section 30.  Benefits of this Agreement.......................................................................................    40
Section 31.  Severability.....................................................................................................    40
Section 32.  Governing Law....................................................................................................    40
Section 33.  Counterparts.....................................................................................................    41
Section 34.  Descriptive Headings.............................................................................................    41
</TABLE>

                                      A-i
<PAGE>

                               RIGHTS AGREEMENT
                               ----------------

     This Rights Agreement dated as of July 16, 2001 (the "Agreement") is
between Riverstone Networks, Inc., a Delaware corporation (the "Company"), and
Mellon Investor Services LLC, a New Jersey limited liability company, as rights
agent (the "Rights Agent").

                             W I T N E S S E T H:
                             --------------------

     WHEREAS, on July 13, 2001 the Board of Directors of the Company (the
"Board") authorized the issuance of rights (collectively, the "Rights," and
individually a "Right"), each Right being a right to purchase, on the terms and
subject to the provisions of this Agreement, one one-thousandth of a share of
the Company's Preferred Stock (as hereinafter defined); and

     WHEREAS, on July 13, 2001 (the "Declaration Date") the Board (a) authorized
and declared a dividend distribution of one Right for every share of Common
Stock, $.01 par value per share, of the Company outstanding at the Close of
Business (as hereinafter defined) on July 26, 2001 (the "Dividend Record Date"),
and (b) authorized the issuance of, and agreed to issue, one Right (as such
number may be adjusted in accordance with Section 11(i) or 11(p) hereof) for
every share of Common Stock of the Company issued between the Dividend Record
Date and the Distribution Date (as hereinafter defined).

     NOW, THEREFORE, in consideration of the premises and the mutual agreements
herein set forth, the parties hereto hereby agree as follows:

Section 1.  Certain Definitions.
            -------------------

     For purposes of this Agreement, the following terms have the meanings
indicated:

     (a)  "Acquiring Person" shall mean any Person who or which, together with
          all Affiliates of such Person, shall be the Beneficial Owner of 15.0%
          or more of the shares of Common Stock then outstanding, but shall not
          include (i) the Company, (ii) any Subsidiary of the Company, (iii) any
          employee benefit plan of the Company or of any Subsidiary of the
          Company, (iv) any Person organized, appointed, or established by the
          Company or a Subsidiary of the Company pursuant to the terms of any
          plan described in clause (iii) above, (v) until the Close of Business
          on August 15, 2001, Cabletron Systems, Inc., or (vi) any Person who
          (A) has reported or is required to report such ownership on Schedule
          13G under the Exchange Act (or any comparable or successor report) or
          on Schedule 13D under the Exchange Act (or any comparable or successor
          report) which Schedule 13D does not state any intention to or reserve
          the right to control or influence the management or policies of the
          Company or engage in any of the actions specified in Item 4 of such
          Schedule (other than the disposition of the

                                      -1-
<PAGE>

          Common Stock), (B) within 10 Business Days of being requested by the
          Company to advise it regarding the same, certifies to the Company that
          such Person acquired shares of Common Stock in excess of 14.9%
          inadvertently or without knowledge of the terms of the Rights;
          provided, however, that if the Person requested to so certify fails to
          --------  -------
          do so within 10 Business Days, then such Person shall become an
          Acquiring Person immediately after such 10 Business Day Period, (C)
          together with all of such Person's Affiliates, thereafter does not
          acquire additional shares of Common Stock while the Beneficial Owner
          of 15.0% or more of the shares of Common Stock then outstanding, and
          (D) if requested to do so by the Company, within a specified number of
          Business Days (to be specified by the Company, but in no case fewer
          than 10 Business Days) following such request from the Company to such
          Person, reduces its Beneficial Ownership of Common Shares to below
          15.0% of the Common Shares then outstanding; provided, however, that
                                                       --------  -------
          if the Person requested to so reduce its Beneficial Ownership fails to
          do so within such specified number of Business Days, then such Person
          shall become an Acquiring Person immediately after such specified
          number of Business Days.

     (b)  "Act" shall mean the Securities Act of 1933 (or any successor act), as
          amended and as may from time to time be in effect.

     (c)  "Affiliate," with respect to any Person, shall mean any other Person
          who is, or who would be deemed to be, an "affiliate" or an "associate"
          of such Person within the respective meanings ascribed to such terms
          in Rule 12b-2 of the General Rules and Regulations under the Exchange
          Act, as such Rule is in effect on the Declaration Date.

     (d)  A Person shall be deemed the "Beneficial Owner" of, and shall be
          deemed to "beneficially own" or have "Beneficial Ownership" of, any
          securities:

          (i)    which such Person or any of such Person's Affiliates has
          "beneficial ownership" of within the meaning of Rule 13d-3 of the
          General Rules and Regulations under the Exchange Act, as such Rule is
          in effect on the Declaration Date;

          (ii)   which such Person or any of such Person's Affiliates has,
          directly or indirectly, the right to acquire (whether such right is
          exercisable immediately or after the passage of time) pursuant to any
          agreement, arrangement or understanding (whether or not in writing) or
          upon the exercise of conversion, exchange or other rights, warrants or
          options, or otherwise;

          (iii)  which such Person or any of such Person's Affiliates has,
          directly or indirectly, the right to vote or dispose of, including
          pursuant to any agreement, arrangement or understanding (whether or
          not in writing); provided, however, that a Person shall not be deemed
                           --------  -------
          the "Beneficial Owner" of, or to "beneficially own,"

                                      -2-
<PAGE>

          any security for purposes of this Section 1(d)(iii) as a result of an
          agreement, arrangement or understanding to vote such security if such
          agreement, arrangement or understanding: (A) arises solely from a
          revocable proxy given in response to a public proxy or consent
          solicitation made pursuant to, and in accordance with, the applicable
          proxy solicitation rules and regulations promulgated under the
          Exchange Act or (B) is made in connection with, or is to otherwise
          participate in, a proxy or consent solicitation made, or to be made,
          pursuant to, and in accordance with, the applicable proxy solicitation
          rules and regulations promulgated under the Exchange Act, in either
          case described in clause (A) or (B) above, whether or not such
          agreement, arrangement or understanding is also then reportable by
          such Person on Schedule 13D under the Exchange Act (or any comparable
          or successor report); or

          (iv)   which are beneficially owned, directly or indirectly, by any
          other Person or any Affiliate thereof with which such Person or any of
          such Person's Affiliates has any agreement, arrangement or
          understanding (whether or not in writing), for the purpose of
          acquiring, holding, voting (except pursuant to a revocable proxy or in
          connection with a proxy or consent solicitation described in clause
          (A) or (B) of the proviso to Section 1(d)(iii) hereof) or disposing of
          any securities of the Company;

provided, however, that for purposes of this Section 1(d) a Person shall not be
--------  -------
deemed the "Beneficial Owner" of, or to "beneficially own," (A) securities
tendered pursuant to a tender or exchange offer made by such Person or any of
such Person's Affiliates until such tendered securities are accepted for
purchase or exchange, (B) securities issuable upon exercise of Rights at any
time prior to the occurrence of a Common Stock Event, or (C) securities issuable
upon exercise of Rights which were held by a Person or its Affiliates prior to
the Distribution Date as long as such Person is not responsible for the
occurrence of the Common Stock Event giving rise to the Distribution Date; and
provided, further, however, that nothing in this Section 1(d) shall cause a
--------  -------  -------
Person engaged in business as an underwriter of securities to be the "Beneficial
Owner" of, or to "beneficially own," any securities acquired through such
Person's participation in good faith in a firm commitment underwriting until the
expiration of 40 days after the date of such acquisition.

     (e)  "Board" shall have the meaning set forth in the preamble to this
          Agreement.

     (f)  "Business Day" shall mean any day other than a Saturday, Sunday or a
          day on which banking institutions in the State of California or the
          city in which the principal office of the Rights Agent is located are
          authorized or obligated by law or executive order to close.

     (g)  "Close of Business" on any given date shall mean 5:00 p.m., Santa
          Clara, California time, on such date; provided, however, that if such
                                                --------  -------
          date is not a Business Day it shall mean 5:00 p.m., Santa Clara,
          California time, on the next succeeding Business Day.

                                      -3-
<PAGE>

     (h)  "Closing Price" shall have the meaning set forth in Section 11(d)
          hereof.

     (i)  "Common Stock" shall mean the Common Stock, $.01 par value per share,
          of the Company, except that "Common Stock" when used with respect to
          any Person other than the Company shall mean either (i) the common
          stock (or other capital stock or shares of beneficial interest) of
          such Person with the greatest voting power, or (ii) the equity
          securities or other equity interests having power to control or direct
          the management and affairs of such Person, or if such Person is a
          Subsidiary of another Person, the Person (A) who ultimately controls
          such Person that is the Subsidiary and (B) which has outstanding such
          common stock (or such other capital stock, equity securities or
          interests).

     (j)  "Common Stock Equivalents" shall have the meaning set forth in Section
          11(a)(iii) hereof.

     (k)  "Common Stock Event" shall mean the occurrence of any event described
          in (i) Section 11(a)(ii) hereof or (ii) clause (a), (b) or (c) of the
          first sentence of Section 13 hereof.

     (l)  "Company" shall have the meaning set forth in the preamble to this
          Agreement.

     (m)  "Current Market Price" shall have the meaning set forth in Section
          11(d) hereof.

     (n)  "Current Value" shall have the meaning set forth in Section 11(a)(iii)
          hereof.

     (o)  "Declaration Date" shall have the meaning set forth in the preamble to
          this Agreement.

     (p)  "Directors" shall mean the members of the Board.

     (q)  "Disqualified Transferee" shall mean any Person who is a direct or
          indirect transferee of any Right from an Acquiring Person or an
          Affiliate of an Acquiring Person and became such a transferee (x)
          after the occurrence of a Common Stock Event or (y) prior to or
          concurrently with the Acquiring Person becoming such and received such
          Right pursuant to a transfer (whether or not for value) (A) from the
          Acquiring Person to holders of its Common Stock or other equity
          securities or to any Person with whom the Acquiring Person has any
          continuing agreement, arrangement, or understanding (whether or not in
          writing) regarding the transferred Right, or (B) which a majority of
          the Board reasonably determines is part of a plan, arrangement, or
          understanding (whether or not in writing) which has as a primary
          purpose or effect, the avoidance of Section 7(e) hereof.

     (r)  "Distribution Date" shall mean the date which is the later of (A) the
          earlier of (x) the 10th Business Day following the Stock Acquisition
          Date or (y) the 10th Business Day following the Offer Commencement
          Date or (B) such specified or

                                      -4-
<PAGE>

          unspecified date thereafter which is on or after the Dividend Record
          Date, as may be determined by a majority of the Board.

     (s)  "Dividend Record Date" shall have the meaning set forth in the
          preamble to this Agreement.

     (t)  "Equivalent Preferred Stock" shall have the meaning set forth in
          Section 11(b) hereof.

     (u)  "Excess Amount" shall have the meaning set forth in Section 11(a)(iii)
          hereof.

     (v)  "Exchange Act" shall mean the Securities Exchange Act of 1934 (or any
          successor act), as in effect on the Declaration Date.

     (w)  "Exchange Ratio" shall have the meaning set forth in Section 24(a)
          hereof.

     (x)  "Expiration Date" shall have the meaning set forth in Section 7(a)
          hereof.

     (y)  "Offer Commencement Date" shall mean the date of the commencement by
          any Person, other than (i) the Company, (ii) a Subsidiary of the
          Company, (iii) any employee benefit plan of the Company or of any
          Subsidiary of the Company or (iv) any Person organized, appointed, or
          established by the Company or such Subsidiary pursuant to the terms of
          any such plan, of a tender or exchange offer (including when such
          offer is first published or sent or given within the meaning of Rule
          14d-2(a) of the General Rules and Regulations under the Exchange Act)
          if upon consummation thereof such Person and Affiliates thereof would
          be the Beneficial Owner of 15.0% or more of the then outstanding
          shares of Common Stock (including any such date which is after the
          date of this Agreement and prior to the issuance of the Rights on the
          Dividend Record Date or thereafter).

     (z)  "Officers' Certificate" has the meaning set forth in Section 20(b)
          hereof.

     (aa) "Other Consideration" has the meaning set forth in Section 6(a)
          hereof.

     (bb) "Person" shall mean a company, corporation, association, partnership,
          joint venture, limited liability company, trust, estate, organization,
          business, entity or individual, and shall include any successor (by
          merger or otherwise) of any such entity.

     (cc) "Preferred Stock" shall mean the Series A Preferred Stock, $.01 par
          value per share, of the Company, having the rights and preferences set
          forth in the form of Certificate of Designation attached hereto as
          Exhibit A.

     (dd) "Purchase Price" shall have the meaning set forth in Section 7(b)
          hereof.

     (ee) "Redemption Price" shall have the meaning set forth in Section 23
          hereof.

                                      -5-
<PAGE>

     (ff) "Rights" shall have the meaning set forth in the preamble to this
          Agreement.

     (gg) "Rights Agent" shall have the meaning set forth in the preamble of
          this Agreement subject to the appointment of a successor Rights Agent
          pursuant to Section 21 hereof.

     (hh) "Rights Certificates" shall have the meaning set forth in Section 3(a)
          hereof.

     (ii) "Stock Acquisition Date" shall mean the later of (i) the date of the
          first public announcement by an Acquiring Person or the Company that
          an Acquiring Person has become such (including the first date on which
          any filing with any governmental authority disclosing that an
          Acquiring Person has become such becomes available to the public), or
          (ii) the date on which an executive officer of the Company has actual
          knowledge that an Acquiring Person has become such.

     (jj) "Subsidiary" shall mean, as of any date, any Person of which the
          Company (or other specified Person) owns directly, or indirectly
          through a Subsidiary or Subsidiaries, at least a majority of the
          outstanding capital stock (or other shares of beneficial interest)
          entitled to vote generally, or holds directly, or indirectly through a
          Subsidiary or Subsidiaries, at least a majority of partnership or
          similar interests, or is a general partner, or of which the Company
          (or other specified Person) owns voting securities sufficient to elect
          at least a majority of the directors of such Person.

     (kk) "Substitution Period" shall have the meaning set forth in Section
          11(a)(iii) hereof.

     (ll) "Summary of Rights" shall have the meaning set forth in Section 3(b)
          hereof.

     (mm) "Trading Day" shall mean a day on which the principal national
          securities exchange on which such security is listed or admitted to
          trading is open for the transaction of business or, if such security
          is not listed or admitted to trading on any national securities
          exchange, a day which is a Business Day.

Section 2.  Appointment of Rights Agent.
            ---------------------------

     The Company hereby appoints the Rights Agent to act as agent for the
Company in accordance with the terms and conditions hereof, and the Rights Agent
hereby accepts such appointment.  The Company may from time to time appoint such
Co-Rights Agents as it may deem necessary or desirable, upon ten (10) days'
prior written notice to the Rights Agent.  The Rights Agent shall have no duty
to supervise, and in no event be liable for, the acts or omissions of any such
Co-Rights Agent.

Section 3.  Issue of Rights Certificates
            ----------------------------

     (a)  Until the Distribution Date, (i) the Rights will be evidenced (subject
          to the provisions of Section 3(b) hereof) by the certificates
          representing shares of

                                      -6-
<PAGE>

          Common Stock registered in the names of the holders of the Common
          Stock (which certificates shall be deemed also to be certificates for
          the associated Rights) and not by separate rights certificates, and
          (ii) the Rights will be transferable only in connection with the
          transfer of the associated shares of Common Stock. As soon as
          practicable after the Company has notified the Rights Agent of the
          occurrence of the Distribution Date and provided the Rights Agent with
          all necessary information (and if the Rights Agent is not also the
          transfer agent and registrar of Common Stock, provided the Rights
          Agent with the names and addresses of all record holders of Common
          Stock), the Rights Agent will send by first-class, insured, postage
          prepaid mail, to each record holder of the Common Stock as of the
          Close of Business on the Distribution Date, at the address of such
          holder shown on the stock transfer records of the Company, one or more
          rights certificates, in substantially the form of Exhibit B hereto
          (the "Rights Certificates"), evidencing in the aggregate that number
          of Rights to which such holder is entitled in accordance with the
          provisions of this Agreement. As of and after the Distribution Date,
          the Rights will be evidenced solely by such Rights Certificates. The
          Rights are exercisable only in accordance with the provisions of
          Section 7 hereof and are redeemable only in accordance with Section 23
          hereof.

     (b)  As soon as practicable after the Dividend Record Date, the Company
          will cause a copy of a Summary of Rights, in substantially the form
          attached hereto as Exhibit C (the "Summary of Rights"), to be sent by
          first-class, postage prepaid mail, to each record holder of the Common
          Stock as of the Close of Business on the Dividend Record Date, at the
          address of such holder shown on the stock transfer records of the
          Company. With respect to certificates for the Common Stock outstanding
          as of the Dividend Record Date, until the Distribution Date, the
          Rights associated with the shares of Common Stock represented by such
          certificates will be evidenced by such certificates for the Common
          Stock and the registered holders of the Common Stock shall also be the
          registered holders of the associated Rights. Until the Distribution
          Date (or the earlier redemption, expiration or termination of the
          Rights), the surrender for transfer of any of the certificates
          representing shares of the Common Stock outstanding on the Dividend
          Record Date, with or without a copy of the Summary of Rights, shall
          also constitute the transfer of the Rights associated with the Common
          Stock represented by such certificate.

     (c)  Rights shall be issued in respect of all shares of Common Stock issued
          (whether originally issued or delivered from the Company's treasury)
          after the Dividend Record Date but prior to the earliest of (i) the
          Distribution Date, (ii) the Expiration Date, or (iii) the redemption
          of the Rights. Certificates representing such shares of Common Stock
          and certificates issued on transfer of such shares of Common Stock,
          with or without a copy of the Summary of Rights, prior to the
          Distribution Date (or earlier expiration or redemption of the Rights)
          shall be deemed also to be certificates for the associated Rights, and
          commencing as soon

                                      -7-
<PAGE>

          as reasonably practicable following the Dividend Record Date shall
          bear the following legend (or a legend substantially in the form
          thereof):

     This certificate also evidences and entitles the holder to Rights set forth
     in a Rights Agreement between the issuer and Mellon Investor Services LLC,
     as Rights Agent (the "Rights Agent"), dated as of July 16, 2001 (the
     "Rights Agreement"), the terms of which are incorporated herein by
     reference and a copy of which is on file at the principal offices of both
     the issuer and the Rights Agent.  The Rights Agent will mail to the
     registered holder of this certificate a copy of the Rights Agreement, as in
     effect on the date of mailing, without charge upon written request.  Under
     certain circumstances set forth in the Rights Agreement, such Rights will
     be evidenced by separate certificates and will no longer be evidenced by
     this certificate.  Under certain circumstances set forth in the Rights
     Agreement, Rights issued to, or held by any Person who is, was or becomes,
     or acquires shares from, an Acquiring Person or any Affiliate of an
     Acquiring Person (as each such term is defined in the Rights Agreement and
     generally relating to the ownership or purchase of large shareholdings),
     whether currently held by or on behalf of such Person or Affiliate or by
     certain subsequent holders, may become null and void.

Until the Distribution Date or the earlier redemption, expiration or termination
of the Rights, the Rights associated with the Common Stock shall be evidenced by
the Common Stock certificates alone and the registered holders of Common Stock
shall also be the registered holders of the associated Rights, and the surrender
for transfer of any of such certificates shall also constitute the transfer of
the Rights associated with the Common Stock represented by such certificate.

Section 4.  Form of Rights Certificates.
            ---------------------------

     (a)  The Rights Certificates (and the form of assignment and the form of
          exercise notice and certificate to be printed on the reverse thereof)
          shall each be substantially in the form set forth in Exhibit B hereto
          and may have such marks of identification or designation and such
          legends, summaries or endorsements printed thereon as the Company may
          deem appropriate (but which do not affect the duties or
          responsibilities of the Rights Agent) and as are not inconsistent with
          the provisions of this Agreement, or as may be required to comply with
          any applicable law or with any rule or regulation made pursuant
          thereto or with any rule or regulation of any stock exchange on which
          the Rights may from time to time be listed or traded, or to conform to
          usage. Subject to the provisions of Sections 11 and 22 hereof, the
          Rights Certificates, whenever distributed, shall be dated as of the
          Dividend Record Date (or, if the shares pursuant to which the Rights
          are attached are issued thereafter, such date of issuance), shall
          include the date of countersignature and on their face shall entitle
          the holders thereof to purchase such number of one one-thousandths of
          a share of Preferred Stock as shall be set forth therein at the
          Purchase Price (as hereinafter defined), but the amount and type of
          securities issuable upon the exercise of each Right and the Purchase
          Price shall be subject to adjustment as provided herein.

                                      -8-
<PAGE>

     (b)  Any Rights Certificate issued pursuant to Section 3(a) or 22 hereof
          that represents Rights beneficially owned by (i) any Acquiring Person
          or any Affiliate of an Acquiring Person, or (ii) any Disqualified
          Transferee, and any other Rights Certificate issued pursuant to
          Section 6 or 11 hereof upon the transfer, exchange, replacement, or
          adjustment of any such Rights Certificate, shall contain (to the
          extent feasible) the following legend:

     The Rights represented by this Rights Certificate are or were beneficially
     owned by a Person who was or became an Acquiring Person or an Affiliate
     (which includes both affiliates and associates) of an Acquiring Person (as
     each such term is defined in the Rights Agreement between the issuer and
     Mellon Investor Services LLC, as Rights Agent, dated as of July 16, 2001
     (the "Rights Agreement")).  Accordingly, this Rights Certificate and the
     Rights represented hereby may become null and void in the circumstances
     specified in Section 7(e) of the Rights Agreement.  The Rights Agent will
     mail to the registered holder of this certificate a copy of the Rights
     Agreement, as in effect on the date of such mailing, without charge upon
     written request.

Section 5.  Countersignature and Registration.
            ---------------------------------

     The Rights Certificates shall be executed on behalf of the Company by its
Chairman of the Board, President, or any Vice President, either manually or by
facsimile signature, and shall have affixed thereto the Company's seal or
facsimile thereof which shall be attested by the Treasurer or an Assistant
Treasurer of the Company, either manually or by facsimile signature.  The Rights
Certificates shall be countersigned, either manually or by facsimile signature,
by the Rights Agent and shall not be valid for any purpose unless so
countersigned.  In case any officer of the Company who shall have signed any of
the Rights Certificates shall cease to be such officer of the Company before
countersignature by the Rights Agent and issuance and delivery by the Company,
such Rights Certificates, nevertheless, may be countersigned by the Rights
Agent, issued, and delivered with the same force and effect as though the person
who signed such Rights Certificates had not ceased to be such officer of the
Company.  Any Rights Certificate may be signed on behalf of the Company by any
person who, at the actual date of the execution of such Rights Certificate,
shall be a proper officer of the Company to sign such Rights Certificate,
although at the date of the execution of this Agreement any such person was not
such an officer.

     Following the Distribution Date, the Rights Agent shall keep or cause to be
kept, at the office of the Rights Agent designated for such purpose, books for
registration and transfer of the Rights Certificates issued hereunder.  Such
books shall show the names and addresses of the respective holders of the Rights
Certificates, the number of Rights evidenced on its face by each of the Rights
Certificates, and the date of countersignature thereof by the Rights Agent.

                                      -9-
<PAGE>

Section 6.  Transfer, Split Up, Combination and Exchange of Rights Certificates;
            --------------------------------------------------------------------
     Mutilated, Destroyed, Lost or Stolen Rights Certificates.
     --------------------------------------------------------

     (a)  Subject to the provisions of Sections 4(b), 7(e), and 14 hereof, at
          any time after the Close of Business on the Distribution Date, and at
          or prior to the earlier of the Close of Business on the Expiration
          Date or the redemption of the Rights, any Rights Certificate may be
          transferred, split up, combined or exchanged for another Rights
          Certificate or Rights Certificates, entitling the registered holder to
          purchase a like number of one one-thousandths of a share of Preferred
          Stock (or, following a Common Stock Event, Common Stock and/or such
          other securities, cash, or other assets as shall be issuable in
          respect of the Rights in accordance with the terms of this Agreement
          (such other securities, cash or other assets being referred to herein
          as "Other Consideration")) as the Rights Certificate surrendered then
          entitled such holder (or former holder in the case of a transfer) to
          purchase. Any registered holder desiring to transfer, split up,
          combine or exchange any Rights Certificate shall make such request in
          writing delivered to the Rights Agent, and shall surrender the Rights
          Certificate to be transferred, split up, combined, or exchanged at the
          office of the Rights Agent designated for such purpose, accompanied by
          a signature guarantee and such other documentation as the Rights Agent
          may reasonably request. Neither the Rights Agent nor the Company shall
          be obligated to take any action whatsoever with respect to the
          transfer of any such surrendered Rights Certificate until the
          registered holder shall have properly completed and signed the
          certificate contained in the form of assignment on the reverse side of
          such Rights Certificate and shall have provided such additional
          evidence of the identity of the Beneficial Owner from whom the Rights
          evidenced by such Rights Certificate are to be transferred (or the
          Beneficial Owner to whom such Rights are to be transferred) or
          Affiliates thereof as the Company or the Rights Agent shall reasonably
          request. Thereupon, subject to Sections 4(b), 7(e) and 14 hereof, the
          Company shall execute and the Rights Agent shall countersign and
          deliver to the Person entitled thereto a Rights Certificate or Rights
          Certificates, as the case may be, as so requested. The Company may
          require payment by the holders of Rights of a sum sufficient to cover
          any tax or charge that may be imposed in connection with any transfer,
          split up, combination or exchange of Rights Certificates which the
          Company is not required to pay in accordance with Section 9(d) hereof.
          The Rights Agent shall have no duty or obligation under this Section
          unless and until it is satisfied that all such taxes and/or charges
          have been paid.

     (b)  Upon receipt by the Company and the Rights Agent of evidence
          reasonably satisfactory to them of the loss, theft, destruction or
          mutilation of a Rights Certificate, and, in case of loss, theft or
          destruction, the receipt of indemnity or security satisfactory to
          them, and upon reimbursement to the Company and the Rights Agent of
          all reasonable expenses incidental thereto, and upon surrender to the
          Rights Agent and cancellation of the Rights Certificate, if mutilated,
          accompanied by a signature guarantee and such other documentation as
          the Rights

                                      -10-
<PAGE>

          Agent may reasonably request, the Company will execute and deliver a
          new Rights Certificate of like tenor to the Rights Agent for
          countersignature and delivery to the registered owner in lieu of the
          Rights Certificate so lost, stolen, destroyed, or mutilated.

Section 7.  Exercise of Rights; Purchase Price; Expiration Date of Rights.
            -------------------------------------------------------------

     (a)  Except as otherwise provided herein, the registered holder of any
          Rights Certificate may exercise the Rights evidenced thereby in whole
          or in part at any time from and after the Distribution Date and at or
          prior to the Close of Business on July 13, 2011 (the "Expiration
          Date") or the earlier redemption of the Rights. Immediately after the
          Close of Business on the Expiration Date (or the earlier redemption of
          the Rights), all Rights shall be extinguished and all Rights
          Certificates shall become null and void. To exercise Rights, the
          registered holder of the Rights Certificate evidencing such Rights
          shall surrender such Rights Certificate, with the form of election to
          purchase on the reverse side thereof and the certificate contained
          therein duly executed, to the Rights Agent at the office of the Rights
          Agent designated for such purpose, accompanied by a signature
          guarantee and such other documentation as the Rights Agent may
          reasonably request, together with payment in cash, only if by
          electronic or wire transfer, or by certified check or bank check, of
          the Purchase Price with respect to the total number of one one-
          thousandths of a share of Preferred Stock (or, after a Common Stock
          Event, shares and/or similar units of Common Stock or Other
          Consideration) as to which the Rights are exercised (which payment
          shall include any additional amount payable by such Person in
          accordance with Section 9(d) hereof). The Rights Agent shall promptly
          deliver to the Company all payments of the Purchase Price received in
          respect of Rights Certificates accepted for exercise.

     (b)  The purchase price for each one one-thousandth of a share of Preferred
          Stock issuable pursuant to the exercise of a Right (the "Purchase
          Price") shall initially be $115.00, shall be subject to adjustment as
          provided in Section 11 hereof, and shall be payable in lawful money of
          the United States of America.

     (c)  Upon receipt of a Rights Certificate representing the Rights, with the
          form of election to purchase set forth on the reverse side thereof and
          the certificate contained therein duly executed, accompanied by
          payment of the Purchase Price, with respect to each Right so
          exercised, the Rights Agent, subject to Sections 7(e), 11(a)(iii) and
          20(k) hereof, shall thereupon promptly (i) requisition from any
          transfer agent of the Preferred Stock (or Common Stock, as the case
          may be) (or from the Company if there shall be no such transfer agent,
          or make available if the Rights Agent is such transfer agent)
          certificates for the total number of one one-thousandths of a share of
          Preferred Stock (or Common Stock, as the case may be) to be purchased
          and the Company hereby irrevocably authorizes such transfer agent to
          comply with any such request, (ii) after receipt of such certificates,
          cause the same to be delivered to or upon the order of the registered
          holder of such

                                      -11-
<PAGE>

          Rights Certificate, registered in such name or names as may be
          designated in writing by such holder, and (iii) when appropriate,
          requisition from the Company the amount of cash to be paid in lieu of
          issuance of a fractional share in accordance with Section 14 hereof
          and after receipt promptly deliver such cash to or upon the order of
          the registered holder of such Rights Certificate. After the occurrence
          of a Common Stock Event, the Company shall make all necessary
          arrangements so that any Other Consideration then deliverable in
          respect of the Rights is available for distribution by the Rights
          Agent. For purposes of this Section 7, the Rights Agent shall be
          entitled to rely, and shall be protected in relying, on an Officers'
          Certificate from the Company to the effect that the Distribution Date
          has occurred.

     (d)  Subject to Sections 4(b), 7(e) and 14 hereof, in case the registered
          holder of any Rights Certificate shall exercise less than all the
          Rights evidenced thereby, a new Rights Certificate evidencing Rights
          equivalent to the Rights remaining unexercised shall be executed and
          delivered by the Company to the Rights Agent and countersigned and
          delivered by the Rights Agent to the registered holder of such Rights
          Certificate or to such holder's duly authorized assigns.

     (e)  Notwithstanding anything in this Agreement to the contrary, from and
          after the first occurrence of a Common Stock Event, any Rights
          beneficially owned by (i) an Acquiring Person or an Affiliate of an
          Acquiring Person, or (ii) a Disqualified Transferee shall become null
          and void without any further action, and no holder of such Rights
          shall have any rights whatsoever with respect to such Rights, whether
          under any provision of this Agreement or otherwise. The Company shall
          use all reasonable efforts to ensure that the provisions of this
          Section 7(e) and Section 4(b) hereof are complied with, but the
          Company shall have no liability to any holder of Rights Certificates
          or other Person and none of the terms of this Agreement or the Rights
          shall be deemed to be waived with respect to such holder or other
          Person as a result of any failure by the Company to make any
          determinations with respect to an Acquiring Person or any Affiliate of
          an Acquiring Person or Disqualified Transferees hereunder or any
          failure to have a legend placed on any Rights Certificate in
          accordance with Section 4(b) hereof or on any Common Stock certificate
          in accordance with Section 3(c) hereof.

     (f)  Notwithstanding anything in this Agreement to the contrary, neither
          the Rights Agent nor the Company shall be obligated to undertake any
          action with respect to a holder of any Rights Certificate upon the
          occurrence of any purported exercise thereof unless such holder shall
          have (i) properly completed and signed the certificate contained in
          the form of election to purchase set forth on the reverse side of the
          Rights Certificate surrendered for such exercise, and (ii) provided
          such additional evidence of the identity of the Beneficial Owner from
          whom the Rights evidenced by such Rights Certificate are to be
          transferred (or the Beneficial Owner to whom such Rights are to be
          transferred) or Affiliates thereof as the Company or the Rights Agent
          shall reasonably request.

                                      -12-
<PAGE>

Section 8.  Cancellation and Destruction of Rights Certificates.
            ---------------------------------------------------

     All Rights Certificates surrendered for the purpose of and accepted for
exercise, or surrendered for the purpose of redemption, transfer, split up,
combination or exchange shall, if surrendered to the Company or to any of its
agents (other than the Rights Agent), be delivered to the Rights Agent for
cancellation or in canceled form, or, if surrendered to the Rights Agent, shall
be canceled by it, and no Rights Certificates shall be issued in lieu thereof
except as expressly permitted by any of the provisions of this Agreement.  The
Company shall deliver to the Rights Agent for cancellation and retirement, and
the Rights Agent shall so cancel and retire, any other Rights Certificates
purchased or retired by the Company otherwise than upon the exercise thereof.
The Rights Agent shall deliver all canceled Rights Certificates to the Company,
or may, at the written request of the Company, but shall not be required to,
destroy such canceled Rights Certificates, and in such case shall deliver a
certificate of destruction thereof to the Company.

Section 9.  Reservation and Availability of Shares of Preferred Stock; Other
            ----------------------------------------------------------------
     Covenants.
     ----------

     (a)  The Company covenants and agrees that on and after the Distribution
          Date, it shall use reasonable efforts to cause to be reserved and kept
          available out of its authorized and unissued shares of Preferred Stock
          (or, following the occurrence of a Common Stock Event, out of its
          authorized and unissued shares of Common Stock and/or Other
          Consideration, or out of its authorized and issued shares held in its
          treasury), the number of shares of Preferred Stock (or, following a
          Common Stock Event, shares of Common Stock and/or Other Consideration)
          that, except as provided in Section 11(a)(iii) hereof, would then be
          sufficient to permit the exercise in full of all outstanding Rights;
          provided, however, that the reservation of such shares shall be
          --------  -------
          subject and subordinate to any other reservation of such shares made
          by the Company at any time for any lawful purpose; provided, further,
                                                             --------  -------
          however, that in no event shall such failure to so reserve shares
          -------
          affect the rights of any holder of Rights hereunder.

     (b)  The Company covenants and agrees that on and after the Distribution
          Date so long as the Preferred Stock (or, following a Common Stock
          Event, shares and/or similar units of Common Stock and/or Other
          Consideration) issuable upon the exercise of Rights may be listed on
          any national securities exchange, the Company shall use its best
          efforts to cause all shares (or similar units) reserved for such
          issuance to be listed on such exchange upon official notice of
          issuance upon such exercise.

     (c)  The Company covenants and agrees that it shall take all such action as
          may be necessary to ensure that each one one-thousandth of a share of
          Preferred Stock (or, following a Common Stock Event, each share and/or
          similar unit of Common Stock or Other Consideration) delivered upon
          exercise of Rights shall, at the time of delivery of the certificates
          for such shares (or units), subject to payment in full

                                      -13-
<PAGE>

          of the Purchase Price, be duly and validly authorized and issued and
          fully paid and nonassessable.

     (d)  The Company covenants and agrees that it shall pay when due and
          payable any and all taxes and charges which may be payable in respect
          of the issuance or delivery of the Rights Certificates or of any
          shares of Preferred Stock (or, following the occurrence of a Common
          Stock Event, each share and/or similar unit of Common Stock or Other
          Consideration) upon the exercise of Rights; provided, however, that
                                                      --------  -------
          the Company shall not be required to pay any tax or charge which may
          be payable in respect of any transfer involved in the transfer or
          delivery of Rights Certificates or in the issuance or delivery of
          certificates for any shares of Preferred Stock (or, following the
          occurrence of a Common Stock Event, each share and/or similar unit of
          Common Stock or Other Consideration) in a name other than that of the
          registered holder of the Rights Certificate evidencing Rights
          surrendered for exercise or to issue or deliver any certificates for
          any shares of Preferred Stock (and, following the occurrence of a
          Common Stock Event, any shares and/or similar units of Common Stock or
          Other Consideration) upon the exercise of any Rights until any such
          tax or charge shall have been paid (any such tax or charge being
          payable by the holder of such Rights Certificate at the time of
          surrender thereof) or until it has been established to the Company's
          satisfaction that no such tax or charge is due.

     (e)  The Company shall use its best efforts (i) to file, as soon as
          practicable following the earliest date after the first occurrence of
          a Common Stock Event on which the consideration to be delivered by the
          Company upon exercise of the Rights has been determined in accordance
          with this Agreement, or as soon as is required by law following the
          Distribution Date, as the case may be, a registration statement under
          the Act, with respect to the securities issuable upon exercise of the
          Rights on an appropriate form, (ii) to cause such registration
          statement to become effective as soon as practicable after such
          filing, and (iii) to cause such registration statement to remain
          effective (with a prospectus at all times meeting the requirements of
          the Act) until the earlier of (A) the date as of which the Rights are
          no longer exercisable for such securities, or (B) the Expiration Date
          or earlier redemption of the Rights. The Company will also take such
          action as may be appropriate under, or to ensure compliance with, the
          securities or "blue sky" laws of the various states of the United
          States in connection with the exercisability of the Rights. The
          Company may temporarily suspend, for a period of time not to exceed
          ninety (90) days after the date set forth in clause (i) of the first
          sentence of this Section 9(e), the exercisability of the Rights in
          order to prepare and file such registration statement or to permit it
          to become effective. Upon any such suspension, the Company shall issue
          a public announcement stating that the exercisability of the Rights
          has been temporarily suspended. The Company shall thereafter issue a
          public announcement at such time as the suspension is no longer in
          effect. The Company shall notify the Rights Agent whenever it makes a
          public announcement pursuant to this Section 9(e) and give the Rights
          Agent a copy of

                                      -14-
<PAGE>

          such announcement. Notwithstanding any provision of this Agreement to
          the contrary, the Rights shall not be exercisable in any jurisdiction
          unless the requisite qualification in such jurisdiction shall have
          been obtained.

Section 10. Preferred Stock Record Date; Etc.
            ---------------------------------

     Each Person in whose name any certificate for any shares of Preferred Stock
(or, following the occurrence of a Common Stock Event, shares and/or similar
units of Common Stock or Other Consideration) is issued upon the exercise of
Rights shall for all purposes be deemed to have become the holder of record of
such shares of Preferred Stock (or such shares and similar units of Common Stock
and/or Other Consideration, as the case may be) represented thereby, and such
certificate shall be dated the date which is the later of (i) the date upon
which the Rights Certificate evidencing such Rights was duly surrendered, or
(ii) the date upon which payment of the Purchase Price (and any applicable taxes
or charges) in respect thereof was made; provided, however, that if such date is
                                         --------  -------
a date upon which the relevant transfer books of the Company are closed, such
Person shall be deemed to have become the record holder of such shares (or Other
Consideration) on, and such certificate shall be dated, the next succeeding
Business Day on which such transfer books of the Company are open; provided,
                                                                   --------
further, that the Company covenants and agrees that it shall not close such
-------
transfer books for a period exceeding ten consecutive days.  Prior to the
exercise of the Rights evidenced thereby (which shall be deemed to have occurred
on the date such certificate for shares and/or similar units of Preferred Stock,
Common Stock or Other Consideration shall be dated in accordance with this
Section 10), the holder of a Rights Certificate, as such, shall not be entitled
to any rights of a security holder of the Company with respect to the shares of
Preferred Stock or Common Stock (and/or such shares or similar units of Common
Stock or Other Consideration) for which the Rights shall be exercisable,
including, without limitation, the right to vote, to receive dividends or other
distributions, or to exercise any preemptive rights, and shall not be entitled
to receive any notice of any proceedings of the Company, except as expressly
provided herein.

Section 11. Antidilution Adjustments.
            -------------------------

     The Purchase Price and the number and kind of securities covered by each
Right and the number of Rights outstanding are subject to adjustment from time
to time as provided in this Section 11.

     (a)  (i) In the event that the Company shall at any time after the
          Declaration Date (A) declare and pay a dividend on the Preferred Stock
          payable in shares of Preferred Stock, (B) subdivide the outstanding
          Preferred Stock, (C) combine the outstanding Preferred Stock into a
          smaller number of shares, or (D) issue, change, or alter any of its
          shares of capital stock in a reclassification or recapitalization
          (including any such reclassification in connection with a
          consolidation or merger in which the Company is the continuing or
          surviving Person), except as otherwise provided in this Section 11(a)
          and Section 7(e) hereof, then, and in each such case, the Purchase
          Price in effect at the time of the record date for such dividend or
          the effective time of such subdivision, combination, reclassification
          or

                                      -15-
<PAGE>

          recapitalization, and the number and kind of shares of capital stock
          issuable upon exercise of the Rights at such time, shall be
          proportionately adjusted so that the holder of any Right exercised
          after such time shall be entitled to receive the aggregate number and
          kind of shares of Preferred Stock or other capital stock which, if
          such Right had been exercised immediately prior to such time at the
          Purchase Price then in effect and at a time when the transfer books
          for the Preferred Stock (or other capital stock) of the Company were
          open, such holder would have owned upon such exercise and been
          entitled to receive by virtue of such dividend, subdivision,
          combination, reclassification or recapitalization. If an event occurs
          which would require an adjustment under both this Section 11(a)(i) and
          Section 11(a)(ii) hereof, the adjustment provided in this Section
          11(a)(i) shall be in addition to, and shall be made prior to, any
          adjustment required pursuant to Section 11(a)(ii) hereof.

          (ii)  In the event

                    (A)  any Person shall at any time after the Declaration Date
                    become an Acquiring Person; or

                    (A)  any Acquiring Person or any Affiliate of any Acquiring
                    Person, at any time after the Declaration Date, directly or
                    indirectly, shall (1) merge into the Company or otherwise
                    combine with the Company, and the Company shall be the
                    continuing or surviving corporation of such merger or
                    combination and the Common Stock of the Company shall remain
                    outstanding and no shares thereof shall be changed or
                    otherwise transformed into stock or other securities of any
                    other Person or the Company or cash or any other property,
                    (2) in one or more transactions, transfer any assets to the
                    Company in exchange (in whole or in part) for shares of any
                    class of its equity securities or for securities exercisable
                    for or convertible into shares of any such class or
                    otherwise obtain from the Company, with or without
                    consideration, any additional shares of any such class or
                    securities exercisable for or convertible into shares of any
                    such class (other than as part of a pro rata distribution to
                    all holders of such class), (3) sell, purchase, lease,
                    exchange, mortgage, pledge, transfer or otherwise dispose
                    (in one transaction or a series of transactions) to, from or
                    with the Company or any of the Company's Subsidiaries,
                    assets with an aggregate fair market value in excess of 25%
                    of the assets of the Company and its Subsidiaries determined
                    on a consolidated basis on terms and conditions less
                    favorable to the Company than the Company would be able to
                    obtain through arm's-length negotiation with an unaffiliated
                    third party, (4) receive any compensation from the Company
                    or any of the Company's Subsidiaries other than compensation
                    as a director of the Company or for full-time employment as
                    a regular employee at rates in accordance with the Company's
                    (or such Subsidiary's) past practices, (5) receive the
                    benefit (except proportionately as a stockholder), of any
                    loans,

                                      -16-
<PAGE>

                    advances, guarantees, pledges or other financial assistance
                    provided by the Company or any of its Subsidiaries on terms
                    and conditions less favorable to the Company (or such
                    Subsidiary) than the Company would be able to obtain through
                    arm's-length negotiation with an unaffiliated third party or
                    (6) commence a tender or exchange offer for securities of
                    the Company; or

                    (B)  during such time as there is an Acquiring Person at any
                    time after the Declaration Date, there shall be any
                    reclassification of securities (including any combination
                    thereof), or recapitalization of the Company, or any merger
                    or consolidation of the Company with any of its Subsidiaries
                    (whether or not with or into or otherwise involving an
                    Acquiring Person or any Affiliate of an Acquiring Person),
                    or any repurchase by the Company or any of its Subsidiaries
                    of shares of the Common Stock of the Company, or any other
                    class or series of securities issued by the Company, which
                    reclassification, recapitalization, merger, consolidation or
                    repurchase is effected at a time when a majority of the
                    Board consists of persons who are the Acquiring Person or
                    its Affiliates, or nominees or designees of any thereof,
                    which has the effect, directly or indirectly, of increasing
                    by more than 1% the proportionate share of the outstanding
                    shares of any class of equity securities or securities
                    exercisable for or convertible into any class of equity
                    securities of the Company or any of its Subsidiaries which
                    is directly or indirectly owned by an Acquiring Person or
                    any Affiliate of an Acquiring Person

     then, in each such case, upon the Close of Business 10 Business Days after
     the occurrence of such event, proper provision shall be made so that each
     holder of a Right, except as provided in Section 7(e) hereof, shall
     thereafter have the right to receive, upon exercise thereof at the Purchase
     Price in effect at the time of exercise in accordance with the terms of
     this Agreement, in lieu of a number of one one-thousandths of a share of
     Preferred Stock, such number of shares of Common Stock of the Company as
     shall equal the result obtained by (x) multiplying an amount equal to the
     then current Purchase Price by an amount equal to the number of one one-
     thousandths of a share of Preferred Stock for which a Right was or would
     have been exercisable immediately prior to the first occurrence of any such
     event whether or not such Right was then exercisable, and (y) dividing that
     product by 50% of the Current Market Price per share of the Common Stock of
     the Company (as defined in Section 11(d) hereof) determined as of the date
     of such first occurrence.

          (iii) In lieu of issuing whole or fractional shares of Preferred Stock
          (or Common Stock) in accordance with Section 7(c) hereof, the Company
          shall (i) in the event that the number of shares of Preferred Stock
          (or Common Stock) which are authorized by the Company's charter but
          not outstanding or reserved for issuance for purposes other than upon
          exercise of the Rights are not sufficient to permit the exercise in
          full of the Rights in accordance with Section 7(c) hereof, or (ii) if
          a majority of the Board determines that it would be appropriate and
          not contrary to

                                      -17-
<PAGE>

          the interests of the holders of Rights (other than any Acquiring
          Person or Disqualified Transferee or any Affiliate of the Acquiring
          Person or Disqualified Transferee), (A) determine an amount, if any,
          (the "Excess Amount") equal to the excess of (1) the value (the
          "Current Value") of the whole or fractional shares of Preferred Stock
          (or Common Stock) issuable upon the exercise of a Right in accordance
          with Section 7(c) hereof, over (2) the Purchase Price, and (B) with
          respect to each Right, (subject to Section 7(e) hereof) make adequate
          provision to substitute for such whole or fractional shares of
          Preferred Stock (or Common Stock), upon payment of the applicable
          Purchase Price, (1) cash, (2) a reduction in the Purchase Price, (3)
          Common Stock or other equity securities of the Company (including,
          without limitation, shares or units of Preferred Stock or preferred
          stock which the Board has deemed in good faith to have the same value
          as a share of Common Stock (such shares of preferred stock being
          referred to herein as "Common Stock Equivalents")), (4) debt
          securities of the Company, (5) other assets, or (6) any combination of
          the foregoing (which would include the additional consideration
          provided to any holder by reducing the Purchase Price) having an
          aggregate value equal to the Current Value, where such aggregate value
          has been determined by the Board; provided, however, subject to the
                                            --------  -------
          provisions of Section 9(e) hereof, that if the Company shall not have
          made adequate provision to deliver value pursuant to clause (B) above
          within 30 days following the Close of Business 10 Business Days after
          the first occurrence of a Common Stock Event described in Section
          11(a)(ii) hereof, then the Company shall be obligated to deliver, upon
          the surrender for exercise of a Right and without requiring payment of
          the Purchase Price, whole or fractional shares of Preferred Stock (or
          Common Stock) (to the extent available) and then, if necessary, cash,
          securities, and/or assets which in the aggregate are equal to the
          Excess Amount. If the Board shall determine in good faith that it is
          likely that sufficient additional shares of Common Stock or Common
          Stock Equivalents could be authorized for issuance upon exercise in
          full of the Rights, the 30-day period set forth above may be extended
          to the extent necessary, but not more than 90 days following the Close
          of Business 10 Business Days after the first occurrence of such a
          Common Stock Event (such 30 day period) as it may be extended to 90
          days, is referred to herein as the "Substitution Period"). To the
          extent that the Company determines that some action is to be taken
          pursuant to the preceding provisions of this Section 11(a)(iii), the
          Company (x) shall provide, subject to Section 7(e) hereof, that
          (except as to the form of consideration which shall be determined as
          appropriate by a majority of the Board) such action shall apply
          uniformly to all outstanding Rights which shall not have become null
          and void, and (y) may suspend the exercisability of the Rights until
          the expiration of the Substitution Period in order to seek any
          authorization of additional shares and/or to decide the appropriate
          form of distribution to be made pursuant to such provisions and to
          determine the value thereof. In the event of any such suspension, the
          Company shall issue a public announcement stating that the
          exercisability of the Rights has been temporarily suspended. The
          Company shall thereafter issue a public

                                      -18-
<PAGE>

          announcement at such time as the suspension is no longer in effect.
          The Company shall notify the Rights Agent whenever it makes a public
          announcement pursuant to this Section 11(a)(iii), and give the Rights
          Agent a copy of such announcement. For purposes of this Section
          11(a)(iii), the value of the Common Stock issuable upon exercise of a
          Right in accordance with Section 7(c) hereof shall be the Current
          Market Price per share of the Common Stock (as determined pursuant to
          Section 11(d) hereof) on the Close of Business 10 Business Days after
          the date of the first occurrence of such a Common Stock Event and the
          value of any Common Stock Equivalent shall be deemed to be equal to
          the Current Market Price per share of the Common Stock on such date.

     (b)  In the event the Company shall, after the Dividend Record Date, fix a
          record date for the issuance of any options, warrants, or other rights
          to all holders of Preferred Stock entitling them (for a period
          expiring within 45 calendar days after such record date) to subscribe
          for or purchase (i) Preferred Stock or (ii) shares having the same
          rights, privileges and preferences as the shares of any number of one
          one-thousandths of a share of Preferred Stock ("Equivalent Preferred
          Stock") or (iii) securities convertible into Preferred Stock or
          Equivalent Preferred Stock at a price per share of Preferred Stock or
          Equivalent Preferred Stock (or having a conversion price per share of
          Preferred Stock or Equivalent Preferred Stock, if a security is
          convertible into Preferred Stock or Equivalent Preferred Stock) less
          than the Current Market Price per share of Preferred Stock (determined
          in accordance with Section 11(d) hereof) determined as of such record
          date, the Purchase Price to be in effect after such record date shall
          be determined by multiplying the Purchase Price in effect immediately
          prior to such record date by a fraction, the numerator of which shall
          be the number of shares of Preferred Stock outstanding on such record
          date plus the number of shares of Preferred Stock and/or Equivalent
          Preferred Stock which the aggregate minimum offering price of the
          total number of shares of one one-thousandths of a share of Preferred
          Stock and/or Equivalent Preferred Stock so to be offered (and/or the
          aggregate minimum conversion price of such convertible securities so
          to be offered) would purchase at such Current Market Price, and the
          denominator of which shall be the number of shares of Preferred Stock
          outstanding on such record date plus the maximum number of additional
          shares of Preferred Stock and/or Equivalent Preferred Stock to be
          offered for subscription or purchase (or the maximum number of shares
          into which such convertible securities so to be offered are
          convertible). In case such subscription price may be paid by delivery
          of consideration part or all of which shall be in a form other than
          cash, for purposes of this Section 11(b) the value of such
          consideration shall be the fair market value thereof as determined in
          good faith by the Board (which determination shall be described in an
          Officers' Certificate filed with the Rights Agent). Shares of
          Preferred Stock owned by or held for the account of the Company shall
          not be deemed outstanding for the purpose of any such computation.
          Such adjustment shall be made successively whenever such a record date
          is fixed; and in the event that such options, warrants or other rights
          are not so issued, the Purchase Price

                                      -19-
<PAGE>

          shall be adjusted to be the Purchase Price which would then be in
          effect if such record date had not been fixed (subject, however, to
          such other adjustments as are provided herein).

     (c)  In the event that the Company shall, after the Dividend Record Date,
          fix a record date for the making of a distribution to all holders of
          Preferred Stock (including any such distribution made in connection
          with a consolidation or merger in which the Company is the surviving
          or continuing Person) of evidences of indebtedness, cash (other than
          cash dividends paid out of the earnings or retained earnings of the
          Company and its Subsidiaries determined on a consolidated basis in
          accordance with generally accepted accounting principles consistently
          applied), other property (other than a dividend payable in a number of
          one one-thousandths of a share of Preferred Stock, but including any
          dividend payable in capital stock other than Preferred Stock), or
          subscription rights or warrants (excluding those referred to in
          Section 11(b) hereof), the Purchase Price to be in effect after such
          record date shall be determined by multiplying the Purchase Price in
          effect immediately prior to such record date by a fraction, of which
          the numerator shall be (i) the Current Market Price per share of
          Preferred Stock (as defined in Section 11(d) hereof) determined as of
          such record date, less (ii) the sum of (A) that portion of cash plus
                            ----
          (B) the fair market value, as determined in good faith by the Board
          (which determination shall be described in an Officers' Certificate
          filed with the Rights Agent) of that portion of such evidences of
          indebtedness, such other property, and/or such subscription rights or
          warrants applicable to one share of Preferred Stock and of which the
          denominator shall be such Current Market Price per share of the
          Preferred Stock. Such adjustments shall be made successively whenever
          such a record date is fixed; and in the event such distribution is not
          so made, the Purchase Price shall again be adjusted to be the Purchase
          Price which would then be in effect if such record date had not been
          fixed (subject, however, to such other adjustments as are provided
          herein).

     (d)  For purposes of any computation pursuant to Section 11(a)(iii) hereof,
          the "Current Market Price" per share (or unit) of any security on any
          date shall be deemed to be the average of the daily Closing Prices of
          such security for the 10 consecutive Trading Days immediately after
          such date, and for the purpose of any other computation hereunder, the
          "Current Market Price" per share (or unit) of any security on any date
          shall be deemed to be the average of the daily Closing Prices of such
          security for the 20 consecutive Trading Days immediately prior to such
          date; provided, however, that in the event that the Current Market
                --------  -------
          Price per share of such security is determined during a period
          following the announcement by the issuer of such security of (i) a
          dividend or distribution on such security payable in shares (or units)
          of such security or securities convertible into shares (or units) of
          such security, or (ii) any subdivision, combination or
          reclassification of such security, and prior to the expiration of such
          10 Trading Days or 20 Trading Days after (A) the ex-dividend date for
          such dividend or distribution, or (B) the record date for such
          subdivision, combination or reclassification, as the

                                      -20-
<PAGE>

     case may be, then, and in each such case, the "Current Market Price" shall
     be the Closing Price of such security on the last day of such respective 10
     Trading Day or 20 Trading Day period. For purposes of this Agreement, the
     "Closing Price" of any security on any day shall be the last sale price,
     regular way, with respect to shares (or units) of such security, or, in
     case no such sale takes place on such day, the average of the closing bid
     and asked prices, regular way, with respect to such security, in either
     case as reported in the principal consolidated transaction reporting system
     with respect to securities listed or admitted to trading on the New York
     Stock Exchange; or, if such security is not listed or admitted to trading
     on the New York Stock Exchange, as reported in the principal consolidated
     transaction reporting system with respect to securities listed on the
     principal national securities exchange on which such security is listed or
     admitted to trading; or, if such security is not so listed or admitted to
     trading, the last quoted sale price with respect to shares (or units) of
     such security, or, if not so quoted, the average of the high bid and low
     asked prices in the over-the-counter market with respect to shares (or
     units) of such security, as reported by the National Association of
     Securities Dealers, Inc. Automated Quotation System or such other similar
     system then in use; or, if on any such date such security is not quoted by
     any such organization, the average of the closing bid and asked prices with
     respect to shares (or units) of such security, as furnished by a
     professional market maker making a market in such security selected by the
     Board; or, if no such market maker is available, the fair market value of
     shares (or units) of such security as of such day as determined in good
     faith by the Board (which determination shall be described in an Officers'
     Certificate filed with the Rights Agent); provided, however, that the
                                               --------  -------
     "Closing Price" of one one-thousandth of a share of Preferred Stock as of
     any Trading Day shall be equal to the Closing Price of a whole share of
     Preferred Stock on such Trading Day divided by 1,000; provided, further,
                                                           --------  -------
     that if the Closing Price of such a share of Preferred Stock as of any
     Trading Day cannot be reasonably determined by the foregoing provisions,
     the "Closing Price" of one one-thousandth of a share of Preferred Stock on
     such Trading Date shall be the Closing Price of a share of Common Stock on
     such Trading Day.

(e)  No adjustment in the Purchase Price shall be required unless adjustment
     would require an increase or decrease of at least 1% in such price;
     provided, however, that any adjustments which by reason of this Section
     --------  -------
     11(e) are not required to be made shall be carried forward and taken into
     account in any subsequent adjustment.  All calculations under this Section
     11 shall be made to the nearest cent or to the nearest (x) ten-thousandth
     of a share (or similar unit) of Common Stock or securities other than
     Preferred Stock or Equivalent Preferred Stock or (y) ten-millionth of a
     share of Preferred Stock or Equivalent Preferred Stock.  Notwithstanding
     the first sentence of this Section 11(e), any adjustment required by this
     Section 11 shall be made no later than the earlier of (i) three years from
     the date of the transaction which mandates the adjustment or (ii) the
     Expiration Date.  Anything in this Section 11 to the contrary
     notwithstanding, the Company

                                      -21-
<PAGE>

     shall be entitled to make such reductions in the Purchase Price, in
     addition to those required by this Section 11, as it in its discretion
     shall determine to be advisable in order that any dividends, subdivision of
     shares, distribution of rights to purchase shares of beneficial interest or
     other stock or securities, or distribution of securities convertible into
     or exchangeable for stock hereafter made by the Company to its stockholders
     shall not be taxable.

(f)  In the event that at any time, as a result of an adjustment made in respect
     of a Common Stock Event, the holder of any Right thereafter exercised shall
     become entitled to receive any shares of capital stock of the Company other
     than shares of Preferred Stock, thereafter the number of such other shares
     so receivable upon exercise of any Right and the Purchase Price thereof
     shall be subject to adjustment from time to time in a manner and on terms
     as nearly equivalent as practicable to the provisions with respect to such
     other shares contained in Sections 11(a), (b), (c), (e), (g), (h), (i),
     (j), (k), (m) and (p) hereof, and the provisions of Sections 7, 9, 10,
     11(d), 13 and 14 hereof with respect to the shares of Preferred Stock shall
     apply on like terms to any such other shares.

(g)  All Rights originally issued by the Company subsequent to any adjustment
     made to the Purchase Price hereunder shall evidence the right to purchase,
     at the adjusted Purchase Price, the number of one one-thousandths of a
     share of Preferred Stock purchasable from time to time hereunder upon
     exercise of the Rights represented thereby, all subject to further
     adjustment as provided herein.

(h)  Unless the Company shall have exercised its election as provided in Section
     11(i) hereof, upon each adjustment of the Purchase Price as a result of the
     calculations made pursuant to Sections 11(b) and 11(c) hereof, each Right
     outstanding immediately prior to the making of such adjustment shall
     thereafter evidence the right to purchase, at the adjusted Purchase Price,
     that number of one one-thousandths of a share of Preferred Stock
     (calculated to the nearest ten-millionth of a share) obtained by (i)
     multiplying (x) the number of one one-thousandths of a share of Preferred
     Stock covered by a Right immediately prior to this adjustment, by (y) the
     Purchase Price in effect immediately prior to such adjustment of the
     Purchase Price, and (ii) dividing the product so obtained by the Purchase
     Price in effect immediately after such adjustment of the Purchase Price.

(i)  Assuming that no other adjustment pursuant to this Section 11 has been
     made, the Company may elect on or after the date of any adjustment of the
     Purchase Price to adjust the number of Rights in substitution for any
     adjustment in the number of one one-thousandths of a share of Preferred
     Stock purchasable upon the exercise of a Right.  Each of the Rights
     outstanding after such adjustment of the number of Rights shall be
     exercisable for the number of one one-thousandths of a share of Preferred
     Stock for which a Right was exercisable immediately prior to such
     adjustment.  Each Right held of record prior to such adjustment of the
     number of Rights shall become that number of Rights (calculated to the
     nearest

                                      -22-
<PAGE>

     ten-thousandth) obtained by dividing the Purchase Price in effect
     immediately prior to such adjustment of the Purchase Price by the Purchase
     Price in effect immediately after such adjustment of the Purchase Price.
     The Company shall make a public announcement (with prompt written notice
     thereof to the Rights Agent) of its election to adjust the number of
     Rights, indicating the record date for the adjustment, and, if known at the
     time, the amount of the adjustment to be made. This record date may be the
     date on which the Purchase Price is adjusted or any day thereafter, but, if
     the Rights Certificates have been issued, shall be at least 10 days later
     than the date of the public announcement. If Rights Certificates have been
     issued, upon each adjustment of the number of Rights pursuant to this
     Section 11(i) the Company shall, as promptly as practicable, cause to be
     distributed to holders of record of Rights Certificates on such record date
     Rights Certificates evidencing, subject to Section 14 hereof, the
     additional Rights to which such holders shall be entitled as a result of
     such adjustment, or, at the option of the Company, shall cause to be
     distributed to such holders of record in substitution and replacement for
     the Rights Certificates held by such holders prior to the date of
     adjustment, and upon surrender thereof, if required by the Company, new
     Rights Certificates evidencing all the Rights to which such holders shall
     be entitled after such adjustment. Rights Certificates so to be distributed
     shall be issued, executed, and countersigned in the manner provided for
     herein (and may bear, at the option of the Company, the adjusted Purchase
     Price) and shall be registered in the names of the holders of record of
     Rights Certificates on the record date specified in the public
     announcement.

(j)  Irrespective of any adjustment or change in the Purchase Price or the
     number of whole or fractional shares of Preferred Stock issuable upon
     exercise of such Rights, the Rights Certificates theretofore and thereafter
     issued may continue to express the Purchase Price per share and the number
     of one one-thousandths of a share of Preferred Stock which were expressed
     in the initial Rights Certificates issued hereunder.

(k)  Before taking any action that would cause an adjustment reducing the
     Purchase Price below the then par value, if any, of the number of one one-
     thousandths of a share of Preferred Stock issuable upon exercise of the
     Rights, the Company shall take any corporate action which may, in the
     opinion of its counsel, be necessary in order that the Company may validly
     and legally issue such number of fully paid and nonassessable one one-
     thousandths of a share of Preferred Stock at such adjusted Purchase Price.

(l)  In any case in which this Section 11 shall require that an adjustment in
     the Purchase Price be made effective as of a record date for a specified
     event, the Company may elect to defer until the occurrence of such event
     the issuing to the holder of any Right exercised after such record date of
     the number of one one-thousandths of a share of Preferred Stock or other
     capital stock or securities of the Company, if any, issuable upon such
     exercise over and above the number of one

                                      -23-
<PAGE>

     one-thousandths of a share of Preferred Stock or other capital stock or
     securities of the Company, if any, issuable upon such exercise on the basis
     of the Purchase Price in effect prior to such adjustment; provided,
                                                               --------
     however, that the Company shall deliver to such holder a due bill or other
     -------
     appropriate instrument evidencing such holder's right to receive such
     additional securities upon the occurrence of the event requiring such
     adjustment.

(m)  Anything in this Section 11 to the contrary notwithstanding, the Company
     shall be entitled to make such reductions in the Purchase Price, in
     addition to those adjustments expressly required by this Section 11, as and
     to the extent that it, by means of a resolution of the Board acting in good
     faith, shall determine to be advisable in order that any consolidation or
     subdivision of the Common Stock, issuance wholly for cash of any Common
     Stock at less than the Current Market Price thereof, issuance wholly for
     cash of Common Stock (or other securities which by their terms are
     convertible into or exchangeable for Common Stock), dividends payable in
     shares of Common Stock or other capital stock or shares of beneficial
     interest, or issuance of rights, options, or warrants referred to
     hereinabove in this Section 11, hereafter made or declared by the Company
     to the holders of its Common Stock, shall not be taxable to such holders.

(n)  The Company covenants and agrees that it shall not, at any time after the
     Distribution Date, (i) consolidate with any other Person (other than a
     Subsidiary of the Company in a transaction that complies with Section 11(o)
     hereof), (ii) merge with or into any other Person (other than a Subsidiary
     of the Company in a transaction which complies with Section 11(o) hereof),
     or (iii) sell or transfer (or permit any Subsidiary to sell or transfer),
     in one transaction or a series of related transactions, more than 25% of
     (A) the assets (taken at net asset value as stated on the books of the
     Company and determined on a consolidated basis in accordance with generally
     accepted accounting principles consistently applied) or (B) the earning
     power of the Company and its Subsidiaries (determined on a consolidated
     basis in accordance with generally accepted accounting principles
     consistently applied) to any other Person or Persons (other than the
     Company or any of its Subsidiaries in one or more transactions each of
     which complies with Section 11(o) hereof), if (x) at the time of or
     immediately after such consolidation, merger or sale, there are any rights,
     warrants or other instruments or securities outstanding or agreements
     (whether or not in writing) in effect that would substantially diminish or
     otherwise eliminate the benefits intended to be afforded by the Rights or
     (y) prior to, simultaneously with or immediately after such consolidation,
     merger or sale, the stockholders of such other Person shall have received a
     distribution of Rights previously owned by such Person or any of its
     Affiliates.

(o)  The Company covenants and agrees that, after the Distribution Date, it will
     not, except as permitted by Section 23 or 27 hereof, take (or permit any
     Subsidiary to take) any action if at the time such action is taken it is
     reasonably foreseeable that

                                      -24-
<PAGE>

          such action will diminish substantially or otherwise eliminate the
          benefits intended to be afforded by the Rights.

     (p)  Anything in this Agreement to the contrary notwithstanding, in the
          event that the Company shall at any time after the Dividend
          Declaration Date and prior to the Distribution Date (i) declare or pay
          a dividend on the outstanding shares of Common Stock payable in shares
          of Common Stock, or (ii) effect a subdivision, combination or
          consolidation of the outstanding Common Stock (by reclassification or
          otherwise than by payment of dividends in shares of Common Stock) into
          a greater or smaller number of shares, then in any such case, (i) the
          number of one one-thousandths of a share of Preferred Stock
          purchasable after such event upon proper exercise of each Right shall
          be determined by multiplying the number of one one-thousandths of a
          share of Preferred Stock so purchasable immediately prior to such
          event by a fraction the numerator of which shall be the total number
          of shares of Common Stock outstanding immediately prior to the
          occurrence of the event and the denominator of which shall be the
          total number of shares of Common Stock outstanding immediately
          following the occurrence of such event; and (ii) each share of Common
          Stock outstanding immediately after such event shall have issued with
          respect to it that number of Rights which each share of Common Stock
          outstanding immediately prior to such event had issued with respect to
          it. The adjustments provided for in this Section 11(p) shall be made
          successively whenever such a dividend is declared or paid or such a
          subdivision, combination or consolidation is effected.

Section 12. Certificate of Adjustments.
            ---------------------------

     Whenever an adjustment (including without limitation, an event which causes
Rights to become null and void) is made as provided in Section 11 or 13 hereof,
the Company shall (a) promptly prepare an Officers' Certificate setting forth
such adjustment, including any adjustment in Purchase Price, the number of
shares or Other Consideration payable, and a brief statement of the facts,
computation and methodology accounting for such adjustment, (b) promptly file
with the Rights Agent and with each transfer agent for the Preferred Stock and
Common Stock a copy of such Officers' Certificate, and (c) mail a brief summary
thereof to each registered holder of a Rights Certificate in accordance with
Section 26 hereof. The Rights Agent shall be fully protected in relying on any
such Officers' Certificate and on any adjustment therein contained, and shall
not be deemed to have knowledge of any such adjustment unless and until it shall
have received such an Officers' Certificate.

Section 13. Consolidation, Merger or Sale or Transfer of Assets or Earning
            --------------------------------------------------------------
Power.
------

     In the event that, following the Stock Acquisition Date, directly or
indirectly, (a) the Company shall consolidate with, or merge with and into, any
other Person (other than a Subsidiary of the Company in a transaction that
complies with Section 11(o) hereof) and the Company shall not be the continuing
or surviving Person of such consolidation or merger, (b) any Person (other than
a Subsidiary of the Company in a transaction that complies with

                                      -25-
<PAGE>

Section 11(o) hereof) shall consolidate with, or merge with and into, the
Company, the Company shall be the continuing or surviving Person of such
consolidation or merger and, in connection with such consolidation or merger,
all or part of the Common Stock of the Company shall be changed or otherwise
transformed into other stock or other securities of any other Person or the
Company or cash or any other property, or (c) the Company shall sell or
otherwise transfer (or one or more of its Subsidiaries shall sell or otherwise
transfer), in one transaction or a series of related transactions, more than 25%
of (A) the assets (taken at net asset value as stated on the books of the
Company and determined on a consolidated basis in accordance with generally
accepted accounting principles consistently applied) or (B) the earning power of
the Company and its Subsidiaries (determined on a consolidated basis in
accordance with generally accepted accounting principles consistently applied)
to any Person (other than the Company or any Subsidiary of the Company in one or
more transactions each of which complies with Section 11(o) hereof) then, from
and after such event, proper provision shall be made so that (i) each holder of
a Right, except as provided in Section 7(e) hereof, shall thereafter have the
right to receive, upon the exercise thereof at the Purchase Price in effect at
the time of such exercise in accordance with the terms of this Agreement, such
number of whole or fractional shares of validly authorized and issued, fully
paid, non-assessable, and freely tradeable Common Stock of such other Person (or
                                                                              --
in the case of a transaction or series of transactions described in clause (c)
above, the Person receiving the greatest amount of the assets or earning power
of the Company, or if the Common Stock of such other Person is not and has not
                --
been continuously registered under Section 12 of the Exchange Act for the
preceding 12-month period and such Person is a direct or indirect Subsidiary of
another Person, that other Person, or if such other Person is a direct or
                                   --
indirect Subsidiary of more than one other Person, the Common Stock of two or
more of which are and have been so registered, such other Person whose
outstanding Common Stock has the greatest aggregate value), free and clear of
any liens, encumbrances, rights of first refusal, or other adverse claims, as
shall be equal to the result obtained by (x) multiplying the Purchase Price in
effect immediately prior to the first occurrence of any Common Stock Event
described in this Section 13 by the number of one one-thousandths of a share of
Preferred Stock for which a Right is exercisable immediately prior to such first
occurrence (and without taking into account any prior adjustment made pursuant
to 11(a)(ii)) and (y) dividing that product by 50% of the Current Market Price
per share (as defined in Section 11(d) hereof) of the Common Stock of such other
Person determined as of the date of consummation of such consolidation, merger,
sale, or transfer; (ii) the issuer of such Common Stock shall thereafter be
liable for, and shall assume, by virtue of such consolidation, merger, sale, or
transfer, all the obligations and duties of the Company pursuant to this
Agreement; (iii) the term "Company" shall thereafter be deemed, for all purposes
of this Agreement, to refer to such issuer, it being specifically intended that
the provisions of Section 11 hereof (other than Section 11(a)(ii) hereof) shall
apply only to such issuer following the first occurrence of a Common Stock Event
described in this Section 13; (iv) such issuer shall take such steps (including,
but not limited to, the reservation of a sufficient number of shares of its
Common Stock) in connection with such consummation as may be necessary to assure
that the provisions hereof shall thereafter be applicable, as nearly as
reasonably may be, in relation to the whole or fractional shares of its Common
Stock thereafter deliverable upon the exercise of the Rights; and (v) the
provisions of Section 11(a)(ii) hereof shall be of no effect following the first
occurrence of any Common Stock Event described in

                                      -26-
<PAGE>

clauses (a), (b) or (c) of this Section 13. The Company shall not consummate any
such consolidation, merger, sale or transfer unless (i) such issuer shall have a
sufficient number of authorized shares of its Common Stock which have not been
issued or reserved for issuance as will permit the exercise in full of the
Rights in accordance with this Section 13, and (ii) prior thereto the Company
and such issuer shall have executed and delivered to the Rights Agent a
supplemental agreement so providing and further providing that as soon as
practicable after the date of any Common Stock Event described above in this
Section 13 such issuer shall (A) prepare and file a registration statement under
the Act, with respect to the Rights and the securities purchasable upon exercise
of the Rights on an appropriate form, and will use its best efforts to cause
such registration statement to (I) become effective as soon as practicable after
such filing and (II) remain effective (with a prospectus at all times meeting
the requirements of the Act) until the Expiration Date, and (B) will deliver to
holders of the Rights historical financial statements of such issuer and each of
its Affiliates which comply in all respects with the requirements for
registration on Form 10 under the Exchange Act. Furthermore, in case the Person
which is to be party to a transaction referred to in this Section 13 has any
provision in any of its authorized securities or in its charter or by-laws or
other agreement or instrument governing its affairs, which provision would have
the effect of causing such Person to issue, in connection with, or as a
consequence of, the consummation of a Common Stock Event described in clauses
(a), (b), or (c) of this Section 13, whole or fractional shares of Common Stock
of such Person at less than the then Current Market Price per share thereof (as
defined in Section 11(d) hereof), or to issue securities exercisable for, or
convertible into, Common Stock of such Person at less than such then Current
Market Price, then, in such event, the Company hereby agrees with each holder of
the Rights that it shall not consummate any such transaction unless prior
thereto the Company and such Person shall have executed and delivered to the
Rights Agent a supplemental agreement providing that such provision in question
shall have been canceled, waived, or amended so that it will have no effect in
connection with, or as a consequence of, the consummation of the proposed
transaction. The provisions of this Section 13 shall similarly apply to
successive mergers or consolidations or sales or other transfers. In the event
that a Common Stock Event described in this Section 13 shall occur at any time
after the occurrence of a Common Stock Event described in Section 11(a)(ii)
hereof, the Rights which have not theretofore been exercised shall thereafter
become exercisable, except as provided in Section 7(e) hereof, in the manner
described in this Section 13.

Section 14.  Fractional Rights and Fractional Shares.
             ----------------------------------------
        (a)    The Company shall not be required to issue fractions of Rights or
               to distribute fractions of Rights, except prior to the
               Distribution Date as provided in Section 11(i) hereof, or to
               distribute Rights Certificates which evidence fractional Rights.
               In lieu of issuing such fractional Rights, at the election of the
               Company, there shall be paid to the registered holders of the
               Rights with regard to which such fractional Rights would
               otherwise be issuable, an amount in cash equal to the same
               fraction of the current market value of a whole Right. For the
               purposes of this Section 14(a), the current market value of a
               whole Right shall be the Closing Price of the Rights for the
               Trading Day immediately prior to the date on which such
               fractional Rights would have been otherwise issuable.

                                      -27-
<PAGE>

     (b)       The Company shall not be required to issue fractions of shares of
               its capital stock upon exercise of the Rights or to distribute
               certificates which evidence fractional shares (other than, in
               each case with respect to Preferred Stock or Equivalent Preferred
               Stock, fractions which are integral multiples of one one-
               thousandth of a share of Preferred Stock or Equivalent Preferred
               Stock, as the case may be). Fractions of shares of Preferred
               Stock or Equivalent Preferred Stock, as the case may be, in
               integral multiples of one one-thousandth of a share of Preferred
               Stock or Equivalent Preferred Stock may, at the election of the
               Company, be evidenced by depositary receipts, pursuant to an
               appropriate agreement between the Company and a depository
               selected by it, provided that such agreement shall provide that
               the holders of such depositary receipts shall have all the
               rights, privileges and preferences to which they are entitled as
               beneficial owners of the Preferred Stock or the Equivalent
               Preferred Stock represented by such depositary receipts. In lieu
               of fractional shares, at the election of the Company, there shall
               be paid to the registered holders of Rights at the time such
               Rights are exercised as herein provided an amount in cash equal
               to the same fraction of the current market value of a share of
               such capital stock. For purposes of this Section 14(b), the
               current market value of a share of such capital stock shall be
               the Closing Price of such capital stock for the Trading Day
               immediately prior to the date of such exercise.

     (c)       The holder of a Right, by the acceptance of the Right, expressly
               waives such holder's right to receive any fractional Rights or
               (except as provided in Section 14(b) hereof) any fractional share
               upon exercise of a Right. The Rights Agent shall have no duty or
               obligation with respect to this Section 14 and Section 24 below
               unless and until it has received specific instructions (and
               sufficient cash, if required) from the Company with respect to
               its duties or obligations under such Sections.

Section 15.  Rights of Action.
             -----------------

     Excepting the rights of action given the Rights Agent under Section 18
hereof and except as set forth in Section 20(l) hereof, all rights of action in
respect of this Agreement are vested in the registered holder of each Right; and
any registered holder of any Right, without the consent of the Rights Agent or
of the holder of any other Right, may, in its own behalf and for its own
benefit, enforce, and may institute and maintain any suit, action, or proceeding
against the Company to enforce, or otherwise act in respect of, such registered
holder's right to exercise the rights evidenced by such Right in the manner
provided in such Rights Certificate and in this Agreement, and the Company
hereby agrees to reimburse such registered holder for all expenses (including
reasonable attorneys' fees) incurred by such registered holder in connection
therewith.  Without limiting the foregoing or any remedies available to the
holders of Rights, it is specifically acknowledged that the holders of Rights
would not have an adequate remedy at law for any breach of the obligations
hereunder, and shall be entitled to injunctive relief against actual or
threatened violations of the obligations hereunder of any Person subject to this
Agreement.

                                      -28-
<PAGE>

Section 16. Agreement of Rights Holders.
            ----------------------------
     Every holder of a Right by accepting the same consents and agrees with the
Company and the Rights Agent and with every other holder of a Right that:

     (a)     prior to the Distribution Date, the Rights will be transferable
             only in connection with the transfer of Common Stock;

     (b)     from and after the Distribution Date, the Rights Certificates are
             transferable only on the registry books of the Rights Agent if
             surrendered at the office of the Rights Agent designated for such
             purpose, duly endorsed or accompanied by a proper instrument of
             transfer with a form of assignment and certificate set forth on the
             reverse side thereof duly executed, accompanied by a signature
             guarantee and such other documentation as the Rights Agent may
             reasonably request;

     (c)     subject to Sections 6(a) and 7(f) hereof, the Company and the
             Rights Agent may deem and treat the person in whose name a Rights
             Certificate (or, prior to the Distribution Date, the associated
             Common Stock certificate) is registered as the absolute owner
             thereof and of the Rights evidenced thereby (notwithstanding any
             notations of ownership or writing on the Rights Certificate or,
             prior to the Distribution Date, the associated Common Stock
             certificate, made by anyone other than the Company or the Rights
             Agent) for all purposes whatsoever, and neither the Company nor the
             Rights Agent shall be affected by any notice to the contrary; and

     (d)     notwithstanding anything in this Agreement to the contrary, neither
             the Company nor the Rights Agent shall have any liability to any
             holder of a Right or other Person as a result of its inability to
             perform any of its obligations under this Agreement by reason of
             any preliminary or permanent injunction or other order, decree or
             ruling issued by a court of competent jurisdiction or by a
             governmental, regulatory or administrative agency or commission, or
             any statute, rule, regulation or executive order promulgated or
             enacted by any governmental authority prohibiting or otherwise
             restraining performance of such obligation; provided, however, the
                                                         --------  -------
             Company agrees to use its best efforts to have any such order,
             decree or ruling lifted or otherwise overturned as soon as
             possible.

Section 17. Rights Certificate Holder Not Deemed a Stockholder.
            ---------------------------------------------------

     No holder, as such, of any Rights Certificate shall be entitled to vote,
receive dividends, or otherwise be deemed for any purpose the holder of any
securities of the Company which may be issuable on the exercise of the Rights
represented thereby, nor shall anything contained herein or in any Rights
Certificate be construed to confer upon the holder of any Rights Certificate, as
such, any of the rights of a stockholder of the Company or any right to vote in
the election of directors or upon any matter submitted to stockholders at any
meeting thereof, or to give or withhold consent to any action by the Company, or
to receive notice of meetings or other actions

                                      -29-
<PAGE>

affecting stockholders (except as provided in Section 25 hereof), or to receive
dividends or preemptive rights, or otherwise, until the time specified in
Section 10 hereof.

Section 18.  Concerning the Rights Agent.
             ----------------------------

     The Company agrees to pay to the Rights Agent such reasonable compensation
as shall be agreed to in writing between the Company and the Rights Agent for
all services rendered by it hereunder and, from time to time, on demand of the
Rights Agent, its reasonable expenses and counsel fees and disbursements and
other disbursements incurred in the preparation, delivery, amendment,
administration and execution of this Agreement and the exercise and performance
of its duties hereunder.  The Company also agrees to indemnify the Rights Agent
for, and to hold it harmless against, any and all loss, liability, damages,
judgments, fines, penalties, claims, demands, settlements, costs or expenses
(including, without limitation, the reasonable fees and expenses of legal
counsel), incurred without gross negligence, bad faith or willful misconduct on
the part of the Rights Agent (which gross negligence, bad faith or willful
misconduct must be determined by a final, non-appealable order, judgment, decree
or ruling of a court of competent jurisdiction), for any action taken, suffered
or omitted by the Rights Agent in connection with the acceptance,
administration, exercise and performance of this Agreement, including the costs
and expenses of defending against any claim of liability for any of the
foregoing.  The costs and expenses incurred in enforcing this right of
indemnification shall be paid by the Company.  The provisions of this Section 18
and 20 below shall survive the termination of this Agreement, the exercise or
expiration of the Rights and the resignation or removal of the Rights Agent.

     The Rights Agent shall be fully protected and shall incur no liability for
or in respect of any action taken, suffered, or omitted by it in connection with
its acceptance and administration of this Agreement and the exercise and
performance of its duties hereunder in reliance upon any Rights Certificate or
certificate for any number of one one-thousandths of a share of Preferred Stock,
or for shares of Common Stock or for other securities of the Company, instrument
of assignment or transfer, power of attorney, endorsement, affidavit, letter,
notice, instruction, direction, consent, certificate, statement, or other paper
or document believed by it to be genuine and to be signed and executed by the
proper Person or Persons, and verified or acknowledged as required by this
Agreement, or otherwise upon the advice of counsel as set forth in Section 20
hereof.

Section 19.  Merger or Consolidation or Change of Name of Rights Agent.
             ----------------------------------------------------------

     Any Person into which the Rights Agent may be merged or with which it may
be consolidated, or any Person resulting from any merger or consolidation to
which the Rights Agent shall be a party, or any Person succeeding to the
shareholder services business of the Rights Agent, shall be the successor to the
Rights Agent under this Agreement without the execution or filing of any paper
or any further act on the part of any of the parties hereto; provided, however,
                                                             --------  -------
that such Person would be eligible for appointment as a successor Rights Agent
under the provisions of Section 21 hereof.  In case at the time such successor
Rights Agent shall succeed to the agency created by this Agreement and any of
the Rights Certificates shall have been countersigned but not delivered, any
such successor Rights Agent may adopt the

                                      -30-
<PAGE>

countersignature of the predecessor Rights Agent and deliver such Rights
Certificates so countersigned; and in case at that time any of the Rights
Certificates shall not have been countersigned, any successor Rights Agent may
countersign such Rights Certificates either in the name of the predecessor
Rights Agent or in the name of the successor Rights Agent; and in all such cases
such Rights Certificates shall have the full force provided in the Rights
Certificates and in this Agreement.

     In case at any time the name of the Rights Agent shall be changed and at
such time any of the Rights Certificates shall have been countersigned but not
delivered, the Rights Agent may adopt the countersignature under its prior name
and deliver such Rights Certificates so countersigned; and in case at that time
any of the Rights Certificates shall not have been countersigned, the Rights
Agent may countersign such Rights Certificates either in its prior name or in
its changed name; and in all such cases such Rights Certificates shall have the
full force provided in the Rights Certificates and in this Agreement.

Section 20.  Right and Duties of Rights Agent.
             ----------------------------------

     The Rights Agent undertakes to perform only the duties and obligations
expressly imposed upon it by this Agreement and no implied duties or obligations
shall be read into this Agreement against the Rights Agent.  The Rights Agent
shall perform its duties and obligations hereunder upon the following terms and
conditions:

     (a)  The Rights Agent may consult with legal counsel of its selection (who
          may be legal counsel to the Company or legal counsel to the Rights
          Agent), and the advice or opinion of such counsel shall be full and
          complete authorization and protection to the Rights Agent and the
          Rights Agent shall incur no liability for or in respect to any action
          taken, suffered or omitted by it in good faith and in accordance with
          such advice or opinion.

     (b)  Whenever in the performance of its duties under this Agreement the
          Rights Agent shall deem it necessary or desirable that any fact or
          matter (including, without limitation, the identity of any Acquiring
          Person) be proved or established by the Company prior to taking,
          suffering or omitting to take any action hereunder, such fact or
          matter (unless other evidence in respect thereof be herein
          specifically prescribed) may be deemed to be conclusively proved and
          established by a certificate (an "Officers' Certificate") signed by a
          person believed by the Rights Agent to be the Chairman of the Board,
          the President or any Vice President and by the Treasurer or any
          Assistant Treasurer or the Secretary or any Assistant Secretary of the
          Company and delivered to the Rights Agent; and such Officers'
          Certificate shall be full and complete authorization and protection to
          the Rights Agent and the Rights Agent shall incur no liability for or
          in respect to any action taken, suffered or omitted in good faith by
          it under the provisions of this Agreement in reliance upon such
          Officers' Certificate.

                                      -31-
<PAGE>

     (c)  The Rights Agent shall be liable hereunder only for its own gross
          negligence, bad faith, or willful misconduct (which gross negligence,
          bad faith, or willful misconduct must be determined by a final, non-
          appealable order, judgment, decree or ruling of a court of competent
          jurisdiction). Anything to the contrary notwithstanding, in no event
          shall the Rights Agent be liable for special, punitive, indirect,
          consequential or incidental loss or damage of any kind whatsoever
          (including but not limited to lost profits), even if the Rights Agent
          has been advised of the likelihood of such loss or damage. Any
          liability of the Rights Agent under this Agreement will be limited to
          the amount of fees paid by the Company to the Rights Agent.

     (d)  The Rights Agent shall not be liable for or by reason of any of the
          statements of fact or recitals contained in this Agreement or in the
          Rights Certificates (except its countersignature on such Rights
          Certificate) or be required to verify the same, but all such
          statements and recitals are and shall be deemed to have been made by
          the Company only.

     (e)  The Rights Agent shall not be under any responsibility in respect of
          the validity of this Agreement or the execution and delivery hereof
          (except the due execution hereof by the Rights Agent) or in respect of
          the validity or execution of any Rights Certificate (except its
          countersignature thereof); nor shall it be responsible for any breach
          by the Company of any covenant or condition contained in this
          Agreement or in any Rights Certificate; nor shall it be responsible
          for any adjustment required under the provisions of Sections 11 or 13
          hereof or be responsible for the manner, method or amount of any such
          adjustment or procedures or the ascertaining of the existence of facts
          that would require any such adjustment or procedure (except with
          respect to the exercise of Rights evidenced by Rights Certificates
          after receipt of a certificate delivered pursuant to Section 12
          hereof, describing any such adjustment or procedures); nor shall it by
          any act hereunder be deemed to make any representation or warranty as
          to the authorization or reservation of any Preferred Stock, Common
          Stock or other securities to be issued pursuant to this Agreement or
          any Rights Certificate or as to whether any shares of Common Stock, or
          any shares or similar units of other securities, will, when issued, be
          validly authorized and issued, fully paid, and nonassessable.

     (f)  The Company agrees that it will perform, execute, acknowledge and
          deliver, or cause to be performed, executed, acknowledged and
          delivered, all such further and other acts, instruments and assurances
          as may reasonably be required by the Rights Agent for the carrying out
          or performing by the Rights Agent of the provisions of this Agreement.

     (g)  The Rights Agent is hereby authorized and directed to accept
          instructions with respect to the performance of its duties hereunder
          from any person believed by the Rights Agent to be the Chairman of the
          Board, the President or any Vice

                                      -32-
<PAGE>

          President or the Secretary or any Assistant Secretary or the Treasurer
          or any Assistant Treasurer of the Company, and to apply to such
          officers for advice or instructions in connection with its duties, and
          such instruction shall be full and complete authorization and
          protection to the Rights Agent and it shall not be liable for or in
          respect to any action taken, suffered or omitted to be taken by it in
          good faith in accordance with instructions of any such officer. Any
          application by the Rights Agent for written instructions from the
          Company may, at the option of the Rights Agent, set forth in writing
          any action proposed to be taken, suffered or omitted by the Rights
          Agent with respect to its duties or obligations under this Agreement
          and the date on and/or after which such action shall be taken,
          suffered or omitted and the Rights Agent shall not be liable for or in
          respect to any action taken, suffered or omitted in accordance with a
          proposal included in any such application on or after the date
          specified therein (which date shall not be less than three Business
          Days after the date any such officer actually receives such
          application, unless any such officer shall have consented in writing
          to an earlier date) unless, prior to taking, suffering or omitting any
          such action, the Rights Agent has received written instructions from
          the Company in response to such application specifying the action to
          be taken, suffered or omitted.

     (h)  The Rights Agent and any stockholder, director, officer, Affiliate or
          employee of the Rights Agent may buy, sell, or deal in any of the
          Rights or other securities of the Company or become pecuniarily
          interested in any transaction in which the Company may be interested,
          or contract with or lend money to the Company or otherwise act as
          fully and freely as though it were not Rights Agent under this
          Agreement. Nothing herein shall preclude the Rights Agent or any
          stockholder, director, Affiliate, officer, or employee from acting in
          any other capacity for the Company or for any other Person.

     (i)  The Rights Agent may execute and exercise any of the rights or powers
          hereby vested in it or perform any duty hereunder either itself or by
          or through its attorneys or agents, and the Rights Agent shall not be
          answerable or accountable for any act, default, neglect or misconduct
          of any such attorneys or agents or for any loss to the Company
          resulting from any such act, default, neglect or misconduct absent
          gross negligence, bad faith, or willful misconduct in the selection
          and continued employment thereof (which gross negligence, bad faith,
          or willful misconduct must be determined by a final, non-appealable
          order, judgment, decree or ruling of a court of competent
          jurisdiction).

     (j)  No provision of this Agreement shall require the Rights Agent to
          expend or risk its own funds or otherwise incur any financial
          liability in the performance of any of its duties hereunder or in the
          exercise of its rights if there shall be reasonable grounds for
          believing that repayment of such funds or adequate indemnification
          against such risk or liability is not reasonably assured to it.

                                      -33-
<PAGE>

          (k)  If, with respect to any Rights Certificate surrendered to the
               Rights Agent for exercise or transfer, the certification
               appearing on the reverse side thereof following the form of
               election to purchase has either not been properly completed or
               indicates an affirmative response to clause 1 and/or 2 thereof,
               the Rights Agent shall not take any further action with respect
               to such requested exercise of transfer without first consulting
               with the Company.

          (l)  The provisions of this Section 20 are solely for the benefit of
               the Rights Agent or the Company and any failure or omission under
               this Section 20 shall not affect the rights of the Company under
               this Agreement and neither the Rights Agent nor the Company shall
               have any liability to any holder of Rights or other Person on
               account of such failure or omission.

Section 21.  Change of Rights Agent.
             -----------------------

          The Rights Agent or any successor Rights Agent may resign and be
discharged from its duties under this Agreement upon 30 days' notice in writing
mailed to the Company and to each transfer agent of the Common Stock by
registered or certified mail, and, subsequent to the Distribution Date, to the
holders of the Rights Certificates by first-class mail. The Company may remove
the Rights Agent or any successor Rights Agent upon 30 days' notice in writing,
mailed to the Rights Agent, to each transfer agent of the Common Stock by
registered or certified mail, and, subsequent to the Distribution Date, to the
holders of the Rights Certificates by first-class mail. If the Rights Agent
shall resign or be removed or shall otherwise become incapable of acting, the
Company shall appoint a successor to the Rights Agent. If the Company shall fail
to make such appointment within a period of 30 days after giving notice of such
removal or after it has been notified in writing of such resignation or
incapacity by the resigning or incapacitated Rights Agent or by the holder of a
Rights Certificate (who shall, with such notice, submit such holder's Rights
Certificate for inspection by the Company), then the registered holder of any
Rights Certificate may apply to any court of competent jurisdiction for the
appointment of a new Rights Agent. Any successor Rights Agent, whether appointed
by the Company or by such a court, shall be (a) a Person organized and doing
business under the laws of the United States, the State of New York or the State
of California (or of any other State of the United States so long as such Person
is authorized to do business as a banking institution in the State of New York
or the State of California), in good standing, having an office designated for
such purpose in the State of New York or the State of California, which is
authorized under such laws to exercise stock transfer powers and is subject to
supervision or examination by federal or state authority and which has at the
time of its appointment as Rights Agent a combined capital and surplus of at
least $50,000,000, or (b) an Affiliate of a Person described in clause (a) of
this sentence. After appointment, the successor Rights Agent shall be vested
with the same powers, rights, duties and responsibilities as if it had been
originally named as Rights Agent without further act or deed; but the
predecessor Rights Agent shall deliver and transfer to the successor Rights
Agent any property at the time held by it hereunder, and execute and deliver any
further assurance, conveyance, act or deed necessary for the purpose; and,
except as the context herein otherwise requires, such successor Rights Agent
shall be deemed to be the "Rights Agent" for all purposes of this Agreement. Not
later than the effective date of any such appointment the

                                      -34-
<PAGE>

Company shall file notice thereof in writing with the predecessor Rights Agent
and each transfer agent of the Common Stock, and mail a notice thereof in
writing to the registered holders of the Rights Certificates. Failure to give
any notice provided for in this Section 21, however, or any defect therein,
shall not affect the legality or validity of the resignation or removal of the
Rights Agent or the appointment of the successor Rights Agent, as the case may
be.

Section 22.  Issuance of New Rights Certificates.
             ------------------------------------

     Notwithstanding any of the provisions of this Agreement or of the Rights to
the contrary, the Company may, at its option, issue new Rights Certificates
evidencing Rights in such form as may be approved by the Board to reflect any
adjustment or change in the Purchase Price per share and the number or kind or
class of shares of stock or other securities or property purchasable under the
Rights Certificates made in accordance with the provisions of this Agreement.
In addition, in connection with the issuance or sale by the Company of shares of
Common Stock following the Distribution Date and prior to the redemption or
expiration of the Rights, the Company (a) shall, with respect to shares of
Common Stock so issued or sold pursuant to the exercise of stock options or
under any employee plan or arrangement, or upon the exercise, conversion or
exchange of securities hereinafter issued by the Company, and (b) may, in any
other case, if deemed necessary or appropriate by the Board, issue Rights
Certificates representing the appropriate number of Rights in connection with
such issuance or sale; provided, however, that (i) no such Rights evidenced by a
                       --------  -------
Rights Certificate shall be issued if, and to the extent that, the Company shall
be advised by counsel that such issuance would create a significant risk of
material adverse tax consequences to the Company or the Person to whom such
Rights would be issued, and (ii) no such Rights Certificate shall be issued if,
and to the extent that, appropriate adjustment shall otherwise have been made in
lieu of the issuance thereof.

Section 23.  Redemption and Termination.
             ---------------------------

     The Board, by majority vote, may, at its option, at any time prior to the
earlier of (i) the Distribution Date or (ii) the Close of Business on the
Expiration Date, redeem all (but not less than all) of the then outstanding
Rights at a redemption price of $.01 per Right, appropriately adjusted to
reflect any stock split, stock dividend, combination of shares, or similar
transaction occurring after the date hereof (such redemption price being
hereinafter referred to as the "Redemption Price").  Immediately upon the taking
of such action ordering the redemption of all of the Rights, evidence of which
shall have been filed with the Rights Agent, and without any further action and
without any notice, the right to exercise the Rights so redeemed will terminate
and the only right thereafter of the holders of such Rights so redeemed shall be
to receive the Redemption Price (without the payment of any interest thereon).
Within 10 days after such action ordering the redemption of all of the Rights,
the Company shall give notice of such redemption to the holders of the then
outstanding Rights by mailing such notice to all such holders at their last
addresses as they appear upon the registry books of the Rights Agent or, prior
to the Distribution Date, on the registry books of the transfer agent for the
Common Stock.  Any notice which is mailed in the manner herein provided shall be
deemed given, whether or not the

                                      -35-
<PAGE>

holder receives the notice. Each such notice of redemption shall state the
method by which the payment of the Redemption Price shall be made.

Section 24.  Exchange.
             ---------

         (a)   The Board, by majority vote, may, at its option, at any time
               after any Person becomes an Acquiring Person, exchange all or
               part of the then outstanding and exercisable Rights for shares of
               Common Stock at an exchange ratio of one share of Common Stock
               per Right, appropriately adjusted to reflect any stock split,
               stock dividend or similar transaction occurring after the date
               hereof (such exchange ratio, as the same may be so adjusted from
               time to time, being hereinafter referred to as the "Exchange
               Ratio"). Notwithstanding the foregoing, the Board shall not be
               empowered to effect such exchange at any time after any Person
               (other than (i) the Company, (ii) any Subsidiary of the Company,
               (iii) any employee benefit plan of the Company or of any such
               Subsidiary, (iv) any entity holding Common Stock for or pursuant
               to the terms of any such plan), or (v) until the Close of
               Business on August 15, 2001, Cabletron Systems, Inc., together
               with all Affiliates of such Person, becomes the Beneficial Owner
               of 50% or more of the Common Stock then outstanding.

         (b)   Immediately upon the action of the Board ordering the exchange of
               any Rights pursuant to subsection (a) of this Section 24 and
               without any further action and without any notice, the right to
               exercise such Rights shall terminate and the only right
               thereafter of a holder of such Rights shall be to receive that
               number of shares of Common Stock equal to the number of such
               Rights held by such holder multiplied by the Exchange Ratio. The
               Company shall promptly give public notice of any such exchange;
               provided, however, that the failure to give, or any defect in,
               --------  -------
               such notice shall not affect the validity of such exchange. The
               Company promptly shall mail a notice of any such exchange to the
               Rights Agent and to all of the holders of such Rights at their
               last addresses as they appear upon the registry books of the
               Rights Agent. Any notice which is mailed in the manner herein
               provided shall be deemed given, whether or not the holder
               receives the notice. Each such notice of exchange shall state the
               method by which the exchange of the Common Stock for Rights shall
               be effected and, in the event of any partial exchange, the number
               of Rights which will be exchanged. Any partial exchange shall be
               effected pro rata based on the number of Rights (other than
               Rights which have become void pursuant to the provisions of
               Section 7(e) hereof) held by each holder of Rights.

         (c)   In any exchange pursuant to this Section 24, the Company, at its
               option, may substitute shares of Preferred Stock (or shares of
               Equivalent Preferred Stock) for shares of Common Stock
               exchangeable for Rights, at the initial rate of one one-
               thousandth of a share of Preferred Stock (or share of Equivalent
               Preferred Stock) for each share of Common Stock, as appropriately
               adjusted to reflect adjustments in the voting rights of shares of
               Preferred Stock pursuant to the terms thereof, so

                                      -36-
<PAGE>

               that the fraction of a share of Preferred Stock delivered in lieu
               of each share of Common Stock shall have the same voting rights
               as one share of Common Stock.

          (d)  In the event that there shall not be sufficient shares of Common
               Stock or Preferred Stock issued but not outstanding or authorized
               but unissued to permit any exchange of Rights as contemplated in
               accordance with this Section 24, the Company shall take all such
               action as may be necessary to authorize additional Common Stock
               or Preferred Stock for issuance upon exchange of the Rights.

          (e)  The Company shall not be required to issue fractions of shares of
               Common Stock or to distribute certificates which evidence
               fractional shares of Common Stock. In lieu of such fractional
               shares of Common Stock, the Company shall pay to each registered
               holder of a Rights Certificate with regard to which a fractional
               share of Common Stock would otherwise be issuable an amount in
               cash equal to the same fraction of the current market value of a
               whole share of Common Stock. For the purposes of this paragraph
               (e), the current market value of a whole share of Common Stock
               shall be the Closing Price of a share of Common Stock (as
               determined pursuant to Section 11(d) hereof) for the Trading Day
               immediately prior to the date of exchange pursuant to this
               Section 24.

Section 25.  Notice of Proposed Actions.
             ---------------------------

          In case the Company shall after the Distribution Date propose (a) to
pay any dividend payable in stock of any class to the holders of its Preferred
Stock or to make any other distribution to the holders of its Preferred Stock
(other than a cash dividend out of earnings or the retained earnings of the
Company), or (b) to offer to the holders of its Preferred Stock rights or
warrants to subscribe for or to purchase any additional shares of Preferred
Stock, Common Stock or shares of stock of any other class or any other
securities, rights, or options, or (c) to effect any reclassification of the
Preferred Stock (other than a reclassification involving only the subdivision of
outstanding shares of Preferred Stock), or (d) to effect any consolidation or
merger into or with, or to effect any sale or other transfer (or to permit one
or more of its Subsidiaries to effect any sale or other transfer), in one
transaction or a series of related transactions, of more than 25% of (i) the
assets of the Company and its Subsidiaries (taken at net asset value as stated
on the books of the Company and determined on a consolidated basis in accordance
with generally accepted accounting principles consistently applied) or (ii) the
earning power of the Company and its Subsidiaries (determined on a consolidated
basis in accordance with generally accepted accounting principles consistently
applied) to any other Person or Persons, or (e) to effect the liquidation,
dissolution or winding up of the Company, then, in each such case, the Company
shall give to the Rights Agent and each holder of a Right, in accordance with
Section 26 hereof, a notice of such proposed action, which shall specify the
record date for the purposes of such stock dividend, distribution of rights or
warrants, or the date on which such reclassification, consolidation, merger,
sale, transfer, liquidation, dissolution, or winding up is to take place and the
date of participation therein by the holders of Preferred Stock, if any such
date is to be fixed, and such notice shall be so given in the case of any action
covered by clause (a) or (b) above at least 20 days prior to the record date for
determining holders of the Preferred Stock

                                      -37-
<PAGE>

for purposes of such action, and in the case of any such other action, at least
20 days prior to the date of the taking of such proposed action or the date of
participation therein by the holders of Common Stock whichever shall be the
earlier. The failure to give notice required by this Section 25 or any defect
therein shall not affect the legality or validity of the action taken by the
Company or the vote upon any such action.

     In case any Common Stock Event described in Section 11(a)(ii) hereof shall
occur, then, in any such case, the Company shall as soon as practicable
thereafter give to the Rights Agent and each holder of a Rights Certificate, in
accordance with Section 26 hereof, a notice of the occurrence of such Common
Stock Event, which shall specify such event and the consequences of the event to
holders of Rights under Section 11(a)(ii) hereof.

     Notwithstanding anything in this Agreement to the contrary, prior to the
Distribution Date a filing by the Company with the Securities and Exchange
Commission shall constitute sufficient notice to the holders of securities of
the Company, including the Rights, for purposes of this Agreement and no other
notice need be given.

Section 26.  Notices.
             --------

     Notices or demands authorized by this Agreement to be given or made by the
Rights Agent or by the holder of any Rights Certificate to the Company shall be
sufficiently given or made if sent by first-class mail, postage prepaid,
addressed (until another address is filed in writing with the Rights Agent) as
follows:

          Riverstone Networks, Inc.
          5200 Great America Parkway
          Santa Clara, CA 95054

          Attention: Chief Financial Officer


          Copy to:  David A. Fine, Esq.
                    Ropes & Gray
                    One International Place
                    Boston, MA  02110-2624

     Subject to the provisions of Sections 19 and 21 hereof, any notice or
demand authorized by this Agreement to be given or made by the Company or by the
holder of any Rights Certificate to or on the Rights Agent shall be sufficiently
given or made if sent by first-class mail, postage prepaid, addressed (until
another address is filed in writing with the Company) as follows:


          Mellon Investor Services LLC
          400 S. Hope Street, 4/th/ Floor

                                      -38-
<PAGE>

          Los Angeles, California 90071

          Attention: Relationship Manager

          Copy to:  Mellon Investor Services LLC
                    85 Challenger Road
                    Ridgefield Park, New Jersey 07660-2108

                    Attention: General Counsel

     Notices or demands authorized by this Agreement to be given or made by the
Company or the Rights Agent to the holder of any Rights Certificate shall be
sufficiently given or made if sent by first-class mail, postage prepaid,
addressed to such holder at the address of such holder as shown on the registry
books of the Company.

Section 27.  Supplements and Amendments.
             ---------------------------

     Prior to the Distribution Date, the Board, upon the vote of a majority of
the Board, may from time to time supplement or amend this Agreement without the
approval of any holders of the Rights.  From and after the Distribution Date,
the Board may, upon the vote of a majority of the Board, from time to time amend
this Agreement without the approval of any holders of the Rights in order (i) to
cure any ambiguity, (ii) to correct or supplement any provision contained herein
which may be defective or inconsistent with any other provisions herein, (iii)
to change any time period governing redemption of the Rights or any other time
period or (iv) to make any other provisions in regard to matters or questions
arising hereunder which the Board, upon the vote of a majority of the Board, may
deem necessary or desirable and which shall not adversely affect the interests
of the holders of the Rights (other than any Acquiring Person or Disqualified
Transferee or any Affiliate of an Acquiring Person or Disqualified Transferee).
Any amendment made pursuant to this Section 27 after a Stock Acquisition Date
shall require the approval of a majority of the Board.  Upon the delivery of a
certificate from an appropriate officer of the Company, and, if requested by the
Rights Agent, an opinion of counsel, which states that the proposed supplement
or amendment is in compliance with the terms of this Section 27, the Rights
Agent shall join with the Company in the execution and delivery of any such
supplement or amendment, unless such supplement or amendment affects any of the
rights, duties, or obligations of the Rights Agent hereunder, in which case the
Rights Agent may, but shall not be required to, join in such execution and
delivery.

Section 28.  Successors.
             -----------

     All the covenants and provisions of this Agreement by or for the benefit of
the Company or the Rights Agent shall bind and inure to the benefit of their
respective successors and assigns hereunder.

                                      -39-
<PAGE>

Section 29.  Determinations and Actions by the Board; etc.
             ---------------------------------------------

     The Board shall have the exclusive power and authority to administer this
Agreement and to exercise all rights and powers specifically granted to the
Board, or to the Company, or as may be necessary or advisable in the
administration of this Agreement, including, without limitation, the right and
power to (i) interpret the provisions of this Agreement and (ii) make all
determinations deemed necessary or advisable for the administration of this
Agreement. All such actions, calculations, interpretations and determinations
(including, for purposes of clause (y) below all omissions with respect to the
foregoing) which are done or made by the Board of Directors in good faith and
with the concurrence of a majority of the Board then in office shall (x) be
final, conclusive and binding on the Company, the Rights Agent, the holders of
the Rights and all other parties and (y) not subject any Director to any
liability to the holders of the Rights.

Section 30.  Benefits of this Agreement.
             ---------------------------

     Nothing in this Agreement shall be construed to give to any Person other
than the Company, the Rights Agent, and the registered holders of the Rights
(and, prior to the Distribution Date, the associated shares of Common Stock) any
legal or equitable right, remedy, or claim under this Agreement or the Rights;
but this Agreement shall be for the sole and exclusive benefit of the Company,
the Rights Agent, and the registered holders of the Rights (and, prior to the
Distribution Date, the associated Common Stock).

Section 31.  Severability.
             -------------

     The invalidity or unenforceability of any term or provision hereof shall
not affect the validity or enforceability of any other term or provision hereof.
If any term, provision, covenant or restriction of this Agreement is held by a
court of competent jurisdiction or other authority to be invalid, void or
unenforceable, the remainder of the terms, provisions, covenants and
restrictions of this Agreement shall remain in full force and effect and shall
in no way be affected, impaired or invalidated; provided, however, that
                                                --------  -------
notwithstanding anything in this Agreement to the contrary, if any such term,
provision, covenant or restriction is held by such court or authority to be
invalid, void or unenforceable and the Board determines in its good faith
judgment that severing the invalid language from this Agreement would adversely
affect the purpose or effect of this Agreement, the right of redemption set
forth in Section 23 hereof shall be reinstated and shall not expire until the
Close of Business on the tenth day following the date of such determination by
the Board.

Section 32.  Governing Law.
             --------------

     This Agreement and each Rights Certificate issued hereunder shall be deemed
to be a contract made under the laws of the State of Delaware and for all
purposes shall be governed by and construed in accordance with the laws of said
State applicable to contracts to be made and performed entirely within said
State; provided, however, that all provisions regarding the rights, duties and
obligations of the Rights Agent shall be governed by and construed in accordance

                                      -40-
<PAGE>

with the laws of the State of New York applicable to contracts made and to be
performed entirely within such State.

Section 33.    Counterparts.
               ------------

     This Agreement may be executed in any number of counterparts and each of
such counterparts shall for all purposes be deemed to be an original, and all
such counterparts shall together constitute but one and the same instrument.

Section 34.    Descriptive Headings.
               --------------------

     Descriptive headings of the several Sections of this Agreement are inserted
for convenience only and shall not control or affect the meaning or construction
of any of the provisions hereof.

                                      -41-
<PAGE>

     IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be
duly executed and set their respective hands and seals, all as of the day and
year first above written.

                                         RIVERSTONE NETWORKS, INC.


                                         By: /s/ Romulus Pereira
                                             ------------------------------
                                         Title: President and Chief
                                                Executive Officer


Attest:



By: /s/ Maricar Horton
    ------------------------------------------------------
    Title: Senior Manager, Event Planning & Administration


                                         MELLON INVESTOR SERVICES LLC, as Rights
                                         Agent


Attest:                                  By: /s/ Michael E. Dzieciolowski
                                             ----------------------------
                                             Michael E. Dzieciolowski
                                             Title: Assistant Vice President



By: /s/ Sharon Knepper
    ------------------
    Sharon Knepper
    Title: Vice President

                                      -42-
<PAGE>

                                                                       EXHIBIT A
                                                                       ---------

              FORM OF CERTIFICATE OF DESIGNATION, PREFERENCES AND
                           RIGHTS OF PREFERRED STOCK

                                      of

                           RIVERSTONE NETWORKS, INC.

                        Pursuant to Section 151 of the
                       Delaware General Corporation Law

     Riverstone Networks, Inc., a corporation organized and existing under and
by virtue of the General Corporation Law of the State of Delaware (the
"Corporation") DOES HEREBY CERTIFY:

     That pursuant to the authority conferred upon the Board of Directors (the
"Board of Directors") by the Amended and Restated Certificate of Incorporation
of the Corporation, as amended from time to time, and in accordance with the
provisions of Section 151 of the General Corporation Law of the State of
Delaware, the Board of Directors on July 13, 2001 adopted a resolution providing
for the authorization of a series of Preferred Stock, $.01 par value per share
(the "Preferred Stock") as follows:

     RESOLVED, that pursuant to the authority vested in the Board of Directors
     of this Corporation in accordance with the provisions of its Amended and
     Restated Certificate of Incorporation, as amended from time to time, a
     series of Preferred Stock of the Corporation be and it hereby is created,
     and that the designation and amount thereof and the voting powers,
     preferences and relative, participating, optional and other special rights
     of the shares of such series, and the qualifications, limitations or
     restrictions thereof are as follows:

Section 1.    Designation and Amount.  The shares of such series shall be
              ----------------------
     designated as "Series A Preferred Stock" (the "Series A Stock"), shall have
     a par value per share equal to $.01 and the number of shares constituting
     such series shall be 200,000. The number of shares of Series A Stock may be
     increased or decreased by a resolution duly adopted by the Board of
     Directors, but may not be decreased below the number of shares of Series A
     Stock then outstanding plus the number of shares reserved for issuance upon
     the exercise of outstanding options, rights or warrants or upon conversion
     of any outstanding securities convertible into Series A Stock.

Section 2.    Dividends and Distributions.
              ---------------------------
     (a)       Subject to the prior and superior rights of the holders of any
               shares of any series of Preferred Stock ranking prior and
               superior to the shares of Series A Stock with

                                      A-1
<PAGE>

               respect to dividends, the holders of shares of Series A Stock
               shall be entitled to receive, when, as and if declared by the
               Board of Directors out of funds legally available for the
               purpose, quarterly dividends payable in cash on the last day of
               March, June, September and December in each year (each such date
               being referred to herein as a "Quarterly Dividend Payment Date"),
               commencing on the first Quarterly Dividend Payment Date after the
               first issuance of a share or fraction of a share of Series A
               Stock, in an amount per share (rounded to the nearest cent) equal
               to the greater of (a) $1.00 or (b) subject to the provision for
               adjustment set forth in Section 8 hereof, 1,000 times the
               aggregate per share amount of all cash dividends, and 1,000 times
               the aggregate per share amount (payable in kind) of all non-cash
               dividends or other distributions other than a dividend payable in
               shares of Common Stock, $.01 par value per share, of the
               Corporation (the "Common Stock") or a subdivision of the
               outstanding shares of Common Stock (by reclassification or
               otherwise), declared on the Common Stock since the immediately
               preceding Quarterly Dividend Payment Date or, with respect to the
               first Quarterly Dividend Payment Date, since the first issuance
               of any share or fraction of a share of Series A Stock.

     (b)        The Corporation shall declare a dividend or distribution on the
               Series A Stock as provided in paragraph (a) of this Section 2
               immediately after it declares a dividend or distribution on the
               Common Stock (other than a dividend payable in shares of or a
               subdivision with respect to Common Stock); provided, however,
                                                          --------  -------
               that, in the event no dividend or distribution shall have been
               declared on the Common Stock during the period between any
               Quarterly Dividend Payment Date, a dividend of $1.00 per share on
               the Series A Stock shall nevertheless be payable on such
               subsequent Quarterly Dividend Payment Date.

     (c)       Dividends shall begin to accrue and be cumulative on outstanding
               shares of Series A Stock from the Quarterly Dividend Payment Date
               next preceding the date of issue of such shares of Series A
               Stock, unless the date of issue of such shares is prior to the
               record date for the first Quarterly Dividend Payment Date, in
               which case dividends on such shares shall begin to accrue from
               the date of issue of such shares, or unless the date of issue is
               a Quarterly Dividend Payment Date or is a date after the record
               date for the determination of holders of shares of Series A Stock
               entitled to receive a quarterly dividend and before such
               Quarterly Dividend Payment Date, in either of which events such
               dividends shall begin to accrue and be cumulative from such
               Quarterly Dividend Payment Date. Accrued but unpaid dividends
               shall not bear interest. Dividends paid on the shares of Series A
               Stock in an amount less than the total amount of such dividends
               at the time accrued and payable on such shares shall be allocated
               pro rata on a share-by-share basis among all such shares at the
               time outstanding. The Board of Directors may fix a record date
               for the determination of holders of shares of Series A Stock
               entitled to receive payment of a dividend or distribution
               declared thereon, which record date shall be no more than 60 days
               prior to the date fixed for the payment thereof.

                                      A-2
<PAGE>

Section 3.    Voting Rights.  The holders of shares of Series A Stock shall have
              -------------
     the following voting rights:

     (a)       Subject to the provision for adjustment set forth in Section 8
               hereof, each share of Series A Stock shall entitle the holder
               thereof to 1,000 votes on all matters submitted to a vote of the
               stockholders of the Corporation.

     (b)       Except as otherwise provided herein or required by applicable
               law, the holders of shares of Series A Stock and the holders of
               shares of Common Stock shall vote together as one class on all
               matters submitted to a vote of stockholders of the Corporation.

     (c)       Except as set forth herein or required by applicable law, holders
               of Series A Stock shall have no special voting rights and their
               consent shall not be required (except to the extent they are
               entitled to vote with holders of Common Stock as set forth
               herein) for taking any corporate action.

Section 4.    Certain Restrictions.
              --------------------

     (a)       Whenever quarterly dividends or other dividends or distributions
               payable on the Series A Stock as provided in Section 2 are in
               arrears, thereafter and until all accrued and unpaid dividends
               and distributions, whether or not declared, on shares of Series A
               Stock outstanding shall have been paid in full, the Corporation
               shall not:

               (i)   declare or pay dividends on, make any other distributions
               on, or redeem or purchase or otherwise acquire for consideration
               any shares of stock ranking junior (either as to dividends or
               upon liquidation, dissolution or winding up) to the Series A
               Stock;

               (ii)  declare or pay dividends on or make any other distributions
               on any shares of stock ranking on a parity (either as to
               dividends or upon liquidation, dissolution or winding up) with
               the Series A Stock, except dividends paid ratably on the Series A
               Stock and all such parity stock on which dividends are payable or
               in arrears in proportion to the total amounts to which the
               holders of all such shares are then entitled;

               (iii) redeem or purchase or otherwise acquire for consideration
               shares of any stock ranking on a parity (either as to dividends
               or upon liquidation, dissolution or winding up) with the Series A
               Stock, provided that the Corporation may at any time redeem,
               purchase or otherwise acquire shares of any such parity stock (A)
               in exchange for shares of any stock of the Corporation ranking
               junior (either as to dividends or upon dissolution, liquidation
               or winding up) to the Series A Stock or (B) in accordance with
               subparagraph (iv) of this Section 4(a); or

                                      A-3
<PAGE>

               (iv) redeem or purchase or otherwise acquire for consideration
               any shares of Series A Stock, or any shares of stock ranking on a
               parity with the Series A Stock, except in accordance with a
               purchase offer made in writing or by publication (as determined
               by the Board of Directors) to all holders of the outstanding
               shares of such stock upon such terms as the Board of Directors,
               after consideration of the respective annual dividend rates and
               other relative rights and preferences of the respective series
               and classes, shall determine in good faith will result in fair
               and equitable treatment among the respective series or classes.

     (b)       The Corporation shall not permit any subsidiary of the
               Corporation to purchase or otherwise acquire for consideration
               any shares of stock of the Corporation unless the Corporation
               could, under paragraph (a) of this Section 4, purchase or
               otherwise acquire such shares at such time and in such manner.

Section 5.    Reacquired Shares.  Any shares of Series A Stock redeemed,
              -----------------
     purchased or otherwise acquired by the Corporation in any manner whatsoever
     shall be retired and canceled promptly after the acquisition thereof. All
     such shares shall upon their cancellation become authorized but unissued
     shares of Preferred Stock and may be reissued as part of a new series of
     Preferred Stock to be created by resolution or resolutions of the Board of
     Directors, subject to the conditions and restrictions on issuance set forth
     herein.

Section 6.    Liquidation, Dissolution or Winding Up.
              --------------------------------------

     (a)       Upon any liquidation (voluntary or otherwise), dissolution or
               winding up of the Corporation, no distribution shall be made to
               the holders of shares of Common Stock or any other stock of the
               Corporation ranking junior (upon liquidation, dissolution or
               winding up) to the Series A Stock unless, prior thereto, the
               holders of shares of Series A Stock shall have received $1,000.00
               per share plus an amount equal to all accrued and unpaid
               dividends and distributions thereon, whether or not declared, to
               the date of such payment (the "Series A Liquidation Preference").
               Following the payment of the full amount of the Series A
               Liquidation Preference, no additional distributions shall be made
               to the holders of shares of Series A Stock unless, prior thereto,
               the holders of shares of Common Stock (which term shall include,
               for the purposes only of this Section 6, any series of the
               Corporation's Preferred Stock ranking on a parity with the Common
               Stock upon liquidation, dissolution or winding up) shall have
               received an amount per share (the "Common Adjustment") equal to
               the quotient obtained by dividing (i) the Series A Liquidation
               Preference by (ii) 1,000 (as appropriately adjusted as set forth
               in Section 8 hereof to reflect such events as stock splits, stock
               dividends and recapitalizations with respect to the Common Stock;
               such number in this clause (ii), as the same may be adjusted from
               time to time, is hereinafter referred to as the "Adjustment
               Number"). In the event, however, that there are not sufficient
               assets available to permit payment in full of the Common
               Adjustment, then any remaining assets shall be distributed
               ratably to the holders of Common Stock.

                                      A-4
<PAGE>

               Following the payment of the full amount of the Series A
               Liquidation Preference and the Common Adjustment in respect of
               all outstanding shares of Series A Stock and Common Stock,
               respectively, holders of shares of Series A Stock and holders of
               shares of Common Stock shall receive their ratable and
               proportionate share of any remaining assets to be distributed in
               the ratio of the Adjustment Number to one (1) with respect to
               such Series A Stock and Common Stock, on a per share basis,
               respectively.

     (b)       In the event, however, that there are not sufficient assets
               available to permit payment in full of the Series A Liquidation
               Preference and the liquidation preferences of all other series of
               Preferred Stock, if any, which rank on a parity with the Series A
               Stock, then any remaining assets shall be distributed ratably to
               the holders of the Series A Stock and the holders of such parity
               stock in proportion to their respective liquidation preferences.

     (c)       None of the merger or consolidation of the Corporation into or
               with any other entity, the sale of all or substantially all of
               the property and assets of the Corporation or the distribution to
               the stockholders of the Corporation of all or substantially all
               of the consideration for such sale, unless such consideration
               (apart from the assumption of liabilities) or the net proceeds
               thereof consists substantially entirely of cash, shall be deemed
               to be a liquidation, dissolution or winding up within the meaning
               of this Section 6.

     (d)       Each share of Series A Stock shall stand on a parity with each
               other share of Series A Stock or any other series of the same
               class of Preferred Stock upon voluntary or involuntary
               liquidation, dissolution or distribution of assets or winding up
               of the Corporation.

Section 7.    Consolidation, Merger, etc.  In case the Corporation shall enter
              --------------------------
     into any consolidation, merger, combination or other transaction in which
     the outstanding shares of Common Stock are exchanged for or changed into
     other stock or securities, cash and/or any other property, then in any such
     case the outstanding shares of Series A Stock shall at the same time be
     similarly exchanged or changed in an amount per share (subject to the
     provision for adjustment set forth in Section 8 hereof) equal to 1,000
     times the aggregate amount of stock, securities, cash and/or any other
     property (payable in kind), as the case may be, into which or for which
     each share of Common Stock is changed or exchanged.

Section 8.    Certain Adjustments.  In the event the Corporation shall at any
              -------------------
     time declare or pay any dividend on Common Stock payable in shares of
     Common Stock, or effect a subdivision or combination or consolidation of
     the outstanding shares of Common Stock (by reclassification or otherwise
     than by payment of a dividend in shares of Common Stock) into a greater or
     lesser number of shares of Common Stock, then, in each such case, the
     amounts set forth in Sections 2(a) and (b), 3(a), 6(a) and 7 hereof with
     respect to

                                      A-5
<PAGE>

     the multiple of (i) cash and non-cash dividends, (ii) votes, (iii) the
     Series A Liquidation Preference and (iv) an aggregate amount of stock,
     securities, cash and/or other property referred to in Section 7 hereof,
     shall be adjusted by multiplying such amount by a fraction the numerator of
     which is the number of shares of Common Stock outstanding immediately after
     such event and the denominator of which is the number of shares of Common
     Stock that were outstanding immediately prior to such event.

Section 9.    Ranking.  The Series A Stock shall rank pari passu with (or if
              -------
     determined by the Board of Directors in any vote establishing any other
     series of Preferred Stock, either senior and prior in preference to, or
     junior and subordinate to, as the case may be) each other series of
     Preferred Stock of the Corporation with respect to dividends and/or
     preference upon liquidation, dissolution or winding up.

Section 10.   Redemption.  The shares of Series A Stock may be purchased by the
              ----------
     Corporation at such times and on such terms as may be agreed to between the
     Corporation and the redeeming stockholder, subject to any limitations which
     may be imposed by law or the Amended and Restated Certificate of
     Incorporation, as amended from time to time.

Section 11.   Amendment.  The Amended and Restated Certificate of Incorporation
              ---------
     of the Corporation, as amended from time to time, shall not be amended in
     any manner which would materially alter or change the powers, preferences
     or special rights of the Series A Stock so as to affect them adversely
     without the affirmative vote of the holders of two-thirds or more of the
     outstanding shares of Series A Stock, voting together as a single class.

Section 12.   Fractional Shares.  Series A Stock may be issued in fractions of a
              -----------------
     share which shall entitle the holder, in proportion to such holder's
     fractional shares, to exercise voting rights, receive dividends,
     participate in distributions and to have the benefit of all other rights of
     holders of Series A Stock.

                                      A-6
<PAGE>

     IN WITNESS WHEREOF, this Certificate of Designation was executed on behalf
of the Corporation by its President and Chief Executive Officer and attested by
its Senior Manager, Event Planning & Administration, on July __, 2001.

                                    By___________________________________
                                      Romulus Pereira
                                      President and Chief Executive Officer

Attest:


By___________________

 Marical Horton
 Senior Manager, Event Planning
 & Administration

                                      A-7
<PAGE>

                                                                       EXHIBIT B
                                                                       ---------

                          FORM OF RIGHTS CERTIFICATE

Certificate No. R-                                                _______ Rights

     NOT EXERCISABLE AFTER JULY 13, 2011 OR EARLIER IF ORDER OF REDEMPTION IS
     GIVEN. THE RIGHTS ARE SUBJECT TO REDEMPTION, AT THE OPTION OF THE COMPANY,
     AT $.01 PER RIGHT ON THE TERMS SET FORTH IN THE RIGHTS AGREEMENT. UNDER
     CERTAIN CIRCUMSTANCES, RIGHTS BENEFICIALLY OWNED BY AN ACQUIRING PERSON OR
     AN AFFILIATE (WHICH INCLUDES AFFILIATES AND ASSOCIATES) OF AN ACQUIRING
     PERSON (AS EACH SUCH TERM IS DEFINED IN THE RIGHTS AGREEMENT) AND ANY
     SUBSEQUENT HOLDER OF SUCH RIGHTS MAY BECOME NULL AND VOID. THE RIGHTS SHALL
     NOT BE EXERCISABLE, AND SHALL BE VOID SO LONG AS HELD, BY A HOLDER IN ANY
     JURISDICTION WHERE THE REQUISITE QUALIFICATION TO THE ISSUANCE TO SUCH
     HOLDER, OR THE EXERCISE BY SUCH HOLDER, OF THE RIGHTS IN SUCH JURISDICTION
     SHALL NOT HAVE BEEN OBTAINED OR BE OBTAINABLE. [THE RIGHTS REPRESENTED BY
     THIS CERTIFICATE ARE OR WERE BENEFICIALLY OWNED BY A PERSON WHO WAS OR
     BECAME AN ACQUIRING PERSON OR AN AFFILIATE (WHICH INCLUDES AFFILIATES AND
     ASSOCIATES) OF AN ACQUIRING PERSON (AS EACH SUCH TERM IS DEFINED IN THE
     RIGHTS AGREEMENT). ACCORDINGLY, THIS RIGHTS CERTIFICATE AND THE RIGHTS
     REPRESENTED HEREBY MAY BECOME NULL AND VOID IN THE CIRCUMSTANCES SPECIFIED
     IN SECTION 7(e) OF THE RIGHTS AGREEMENT. THE RIGHTS AGENT WILL MAIL TO THE
     REGISTERED HOLDER OF THIS CERTIFICATE A COPY OF THE RIGHTS AGREEMENT, AS IN
     EFFECT ON THE DATE OF SUCH MAILING, WITHOUT CHARGE UPON WRITTEN REQUEST.]*


                              Rights Certificate

                           RIVERSTONE NETWORKS, INC.

     This certifies that                 , or registered assigns, is the
     registered owner of the number of Rights set forth above, each of which
     entitles the owner thereof, subject to the terms, provisions, and
     conditions of the Rights Agreement dated as of July 16, 2001 (the

__________________________

*    The portion of the legend in brackets shall be inserted only if applicable.

                                      B-1
<PAGE>

     "Rights Agreement") between Riverstone Networks, Inc. (the "Company"), and
     Mellon Investor Services LLC, as Rights Agent (the "Rights Agent"), to
     purchase from the Company at any time after the Distribution Date (as such
     term is defined in the Rights Agreement) and prior to 5:00 p.m. (Santa
     Clara, California time) on July 13, 2011 (the "Expiration Date") at the
     office of the Rights Agent designated for such purpose, or its successors
     as Rights Agent, one one-thousandth of a share of the Series A Preferred
     Stock, with a par value of $.01 per share ("Preferred Stock"), of the
     Company per each Right represented hereby, at a purchase price of $115.00
     per share (the "Purchase Price") upon presentation and surrender of this
     Rights Certificate with the Form of Election to Purchase set forth on the
     reverse side hereof and the certificate contained therein duly completed
     and executed, accompanied by a signature guarantee and such other
     documentation as the Rights Agent may reasonably request. The number of
     Rights evidenced by this Rights Certificate (and the number of shares which
     may be purchased upon exercise thereof) set forth above, and the Purchase
     Price per share set forth above, are the number and Purchase Price as of
     July 13, 2001, based on the shares of Common Stock of the Company as
     constituted at such date.

     As more fully set forth in the Rights Agreement, upon the occurrence of a
Common Stock Event (as such term is defined in the Rights Agreement), if the
Rights evidenced by this Rights Certificate are beneficially owned by (i) an
Acquiring Person or an Affiliate of an Acquiring Person (as each such term is
defined in the Rights Agreement) or (ii) a Disqualified Transferee (as defined
in the Rights Agreement), such Rights shall automatically become null and void
and no holder hereof shall have any right with respect to such Rights from and
after the occurrence of such Common Stock Event.

     The Rights evidenced by this Rights Certificate shall not be exercisable,
and shall be void so long as held, by a holder in any jurisdiction where the
requisite qualification to the issuance to such holder, or the exercise by such
holder, of the Rights in such jurisdiction shall not have been obtained or be
obtainable.

     As provided in the Rights Agreement, the Purchase Price and the number of
whole or fractional shares of Preferred Stock which may be purchased upon the
exercise of the Rights evidenced by this Rights Certificate are subject to
modification and adjustment upon the happening of certain events.

     In the circumstances described in Section 13 of the Rights Agreement, the
securities issuable upon the exercise of the Rights evidenced hereby shall be
the common stock or similar equity securities or equity interests of an entity
other than the Company.

     This Rights Certificate is subject to all of the terms, provisions, and
conditions of the Rights Agreement, which terms, provisions, and conditions are
hereby incorporated herein by reference and made a part hereof and to which
Rights Agreement reference is hereby made for a full description of the rights,
limitations of rights, obligations, duties, and immunities hereunder of the
Rights Agent, the Company, and the holders of the Rights Certificates, which
limitations

                                      B-2
<PAGE>

of rights include the temporary suspension of the exercisability of such Rights
under the specific circumstances set forth in the Rights Agreement. Copies of
the Rights Agreement are on file at the office of the Rights Agent designated
for such purpose and may be obtained by the holder of any Rights upon written
request to the Rights Agent.

     This Rights Certificate, with or without other Rights Certificates, upon
surrender at the office of the Rights Agent designated for such purpose,
accompanied by a signature guarantee and such other documentation as the Rights
Agent may reasonably request, may be exchanged for another Rights Certificate or
Rights Certificates of like tenor and date evidencing Rights entitling the
holder to purchase a like aggregate number of whole or fractional shares of
Preferred Stock (or other consideration, as the case may be) as the Rights
evidenced by the Rights Certificate or Rights Certificates surrendered shall
have entitled such holder to purchase. If this Rights Certificate shall be
exercised in part, the holder shall be entitled to receive, upon surrender
hereof, another Rights Certificate or Rights Certificates for the number of
whole Rights not exercised.

     Subject to the provisions of the Rights Agreement, the Rights evidenced by
this Rights Certificate may be redeemed by the Company by a majority vote of the
Board (as defined in the Rights Agreement) then in office at any time prior to
the earlier of (i) the Distribution Date or (ii) the Close of Business (as
defined in the Rights Agreement) on the Expiration Date, at a redemption price
of $.01 per Right (which amount is subject to adjustment as provided in the
Rights Agreement).

     The Company is not obligated to issue whole or fractional shares of
Preferred Stock (or other securities) upon the exercise of any Right or Rights
evidenced hereby, but in lieu thereof a cash payment may be made at the election
of the Company, as provided in the Rights Agreement.

     No holder of this Rights Certificate, as such, shall be entitled to vote or
receive dividends or be deemed for any purpose the holder of Preferred Stock or
of any other securities of the Company which may at any time be issuable on the
exercise hereof, nor shall anything contained in the Rights Agreement or herein
be construed to confer upon the holder hereof, as such, any of the rights of a
stockholder of the Company or any right to vote for the election of directors or
upon any matter submitted to stockholders at any meeting thereof, or to give or
withhold consent to any action by the Company, or to receive notice of meetings
or other actions affecting stockholders (except as provided in the Rights
Agreement), or to receive dividends or subscription rights, or otherwise, until
the Right or Rights evidenced by this Rights Certificate shall have been
exercised as provided in the Rights Agreement.

     This Rights Certificate shall not be valid or obligatory for any purpose
until it shall have been countersigned by the Rights Agent.

                                      B-3
<PAGE>

     WITNESS the facsimile signature of the proper officers and the seal of the
Company. Dated as of _________________, ____.


                                          RIVERSTONE NETWORKS, INC.


                                          By______________________________
                                           Title:

ATTEST:


______________________
Title:



Countersigned:

MELLON INVESTOR SERVICES LLC, as Rights Agent


By____________________
 Authorized Signatory

 Date of Countersignature:

                                      B-4
<PAGE>

                 [Form of Reverse Side of Rights Certificate]

                              FORM OF ASSIGNMENT
                              ------------------

               (To be executed by the registered holder if such
              holder desires to transfer the Rights Certificate)

     FOR VALUE RECEIVED _______________________

hereby sells, assigns and transfers unto ______________________

____________________________________________________________________
                 (Please print name and address of transferee)

______________________________________________________________________ whose

social security or tax identification number is ______________, the Rights

evidenced by this Rights Certificate, together with all right, title and

interest herein, and does hereby irrevocably constitute and appoint

____________________ Attorney, to transfer the within Rights Certificate on the

books of the within-named Company, with full power of substitution.


Dated: _________________________, ____.



                                          _________________________

                                          Signature


Signature Guaranteed:*


___________________________

     * Signature must be guaranteed by an "Eligible Guarantor Institution" (with
membership in an approved signature guarantee medallion program) pursuant to
Rule 17Ad-15 of the Securities Exchange Act of 1934.

                                      B-5
<PAGE>

                                  Certificate
                                  -----------

     The undersigned hereby certifies by checking the appropriate boxes that:


     (1)  the Rights evidenced by this Rights Certificate [_] are [_] are not
being sold, assigned and transferred by or on behalf of a Person who is or was
an Acquiring Person or an Affiliate of an Acquiring Person (as each such term is
defined in the Rights Agreement); and

     (2)  after due inquiry and to the best knowledge of the undersigned, it [_]
did [_] did not acquire the Rights evidenced by this Rights Certificate after
the occurrence of a Common Stock Event from any Person who is, was or
subsequently became an Acquiring Person or an Affiliate of an Acquiring Person.


Dated:____________________               ______________________________
                                                    Signature

Signature Guaranteed:*


__________________________


                                    NOTICE
                                    ------

     The signature to the foregoing Assignment and Certificate must correspond
to the name as written upon the face of this Rights Certificate in every
particular, without alteration or enlargement or any change whatsoever.

                         FORM OF ELECTION TO PURCHASE
                         ----------------------------

     (To be executed if holder desires to exercise the Rights Certificate)

To Riverstone Networks, Inc.:

     The undersigned hereby irrevocably elects to exercise _________________
Rights represented by this Rights Certificate to purchase the number of one one-
thousandths of a share of Preferred Stock (or other securities) issuable upon
the exercise of such Rights and requests that certificates for such shares be
issued in the name of:

                                      B-6
<PAGE>

Please insert social security
or other identifying number
_____________________________________________________________________________

_____________________________________________________________________________
                        (Please print name and address)

If such number of Rights shall not be all the Rights evidenced by this Rights
Certificate, a new Rights Certificate for the balance remaining of such Rights
shall be registered in the name of and delivered to:

Please insert social security
or other identifying number ____________________________________________________

________________________________________________________________________________
                        (Please print name and address)

Dated: _______________________, ____


                                         ______________________________
                                         Signature

                                         (Signature must conform in all respects
                                         to name of holder as specified on the
                                         face of this Rights Certificate)

Signature Guaranteed:**



__________________________

     * * Signature must be guaranteed by an "Eligible Guarantor Institution"
(with membership in an approved signature guarantee medallion program) pursuant
to Rule 17Ad-15 of the Securities Exchange Act of 1934.

                                      B-7
<PAGE>

                                  Certificate
                                  -----------

     The undersigned hereby certifies by checking the appropriate boxes that:

     (1) the Rights evidenced by this Rights Certificate [_] are [_] are not
being exercised by or on behalf of a Person who is or was an Acquiring Person or
an Affiliate of any such Acquiring Person (as each such term is defined in the
Rights Agreement); and

     (2) after due inquiry and to the best knowledge of the undersigned, it [_]
did [_] did not acquire the Rights evidenced by this Rights Certificate after
the occurrence of a Common Stock Event (as such term is defined in the Rights
Agreement) from any Person who is, was, or subsequently became an Acquiring
Person or an Affiliate of an Acquiring Person.



Dated: _________________, ____              _________________________
                                                        Signature



Signature Guaranteed:***
____________________________
     * ** Signature must be guaranteed by an "Eligible Guarantor Institution"
(with membership in an approved signature guarantees medallion program) pursuant
to Rule 17Ad-15 of the Securities Exchange Act of 1934.

                                      B-8
<PAGE>

                                                                       EXHIBIT C
                                                                       ---------


                           RIVERSTONE NETWORKS, INC.

                          SUMMARY OF PURCHASE RIGHTS


     On July 13, 2001, Riverstone Networks, Inc. (the "Company") declared a
dividend distribution of one preferred stock purchase right (collectively, the
"Rights", and individually, a "Right") for each share of its common stock, $.01
par value per share ("Common Stock").  Each Right entitles the registered holder
to purchase from the Company after the Distribution Date (described below) one
one-thousandth of a share of its Series A Preferred Stock, $.01 par value per
share (the "Preferred Stock").  The exercise price is $115.00 for each one-
thousandth of a share of Preferred Stock.  The distribution of Rights is payable
on August 3, 2001 to the record holders of Common Stock at the close of business
on July 26, 2001.  One Right will also be issued for each share of Common Stock
issued between July 26, 2001 and the Distribution Date.

     Exercisability of the Rights; Distribution Date.  The Rights are not
exercisable until the Distribution Date.  The Distribution Date would occur, if
ever, ten business days after either of the following events:

     .  A public announcement that a person or group other than certain exempt
persons (an "Acquiring Person") has acquired, or obtained the right to acquire,
beneficial ownership of 15.0% or more of the Company's outstanding Common Stock
(the "Stock Acquisition Date") or

     .  The commencement or announcement of an intention to make a tender offer
or exchange offer that would result in a person or group, other than certain
exempt persons, owning 15.0% or more of the Company's outstanding Common Stock.

     Mergers, Asset Sales and Self-Dealing Transactions.  If after the Stock
Acquisition Date the Company is acquired in a merger or other business
combination, or 25% or more of its assets or earning power is sold, proper
provision is to be made so that each holder of a Right would have the right to
receive, upon exercise of the Right, that number of shares of common stock of
the acquiring company which at the time has a market value of two times the
exercise price of the Right.

     In the event that:

     (1)  the Company is the surviving corporation in a merger with an Acquiring
Person and its Common Stock is not changed or exchanged, or

     (2)  an Acquiring Person engages in one of a number of self-dealing
transactions specified in the Rights Agreement described below, or

                                      C-1
<PAGE>

     (3)  during such time as there is an Acquiring Person any recapitalization,
reorganization or other transaction involving the Company occurs which result in
such Acquiring Person's ownership interest being increased by more than 1%,

then each holder of a Right would have the right to receive, upon exercise of
the Right, that number of shares of Common Stock (or, in certain circumstances,
cash, property or other securities of the Company) having a market value of two
times the exercise price of the Right.

     Following the occurrence of any of the events described in this section,
any Rights beneficially owned by any Acquiring Person would immediately become
null and void.

     Exchange Option.  The Board may, at its option, at any time after any
person becomes an Acquiring Person, exchange all or part of the then outstanding
and exercisable Rights for shares of Common Stock at an exchange ratio of one
share of Common Stock per Right.  The Board, however, may not effect an exchange
at any time after any person (other than (i) the Company, (ii) any subsidiary of
the Company, (iii) any employee benefit plan of the Company or any such
subsidiary or any entity holding Common Stock for or pursuant to the terms of
any such plan or (iv) until the close of business on August 15, 2001, Cabletron
Systems, Inc.), together with all affiliates of such person, becomes the
beneficial owner of 50% or more of the Common Stock then outstanding.
Immediately upon the action of the Board ordering the exchange of any Rights and
without any further action and without any notice, the right to exercise such
Rights will terminate and the only right thereafter of a holder of such Rights
will be to receive that number of shares of Common Stock equal to the number of
such Rights held by the holder.

     Transferability of Rights.  Until the Distribution Date, the Common Stock
certificates will evidence the Rights, and the transfer of the Common Stock
certificates will constitute a transfer of the Rights.  After the Distribution
Date, separate certificates evidencing the Rights would be mailed to holders of
record of the Company's Common Stock as of the close of business on the
Distribution Date, and such separate Rights certificates alone would evidence
the Rights.

     Redemption.  The Board of Directors, by a majority vote, may redeem the
Rights at a redemption price of $.01 per Right at any time before the earlier of
the Distribution Date or the close of business on the Expiration Date described
below.  Immediately upon such redemption, the right to exercise the Rights will
terminate, and the Rights holders will become entitled only to receive the
redemption price.

     Expiration Date of Rights.  If not previously exercised or redeemed, the
Rights will expire on July 13, 2011.

     Anti-Dilution Adjustment.  The exercise price, the redemption price, the
exchange ratio and the number of shares of the Preferred Stock or other
securities or property issuable upon exercise of the Rights are subject to
adjustment from time to time to prevent dilution under the following
circumstances:

                                      C-2
<PAGE>

     .  in the event of a stock dividend on, or a subdivision, combination or
reclassification of the Preferred Stock, or

     .  upon the grant to holders of the Preferred Stock of certain rights or
warrants to subscribe for shares of the Preferred Stock or convertible
securities at less than the current market price, or

     .  upon the distribution to holders of the Preferred Stock of evidences of
indebtedness or assets (excluding regular quarterly cash dividends out of the
earnings or retained earnings of the Company and dividends payable in shares of
Preferred Stock) or of subscription rights or warrants (other than those
referred to above).

     With certain exceptions, no adjustment in the exercise price will be
required until cumulative adjustments require an adjustment of at least 1% in
such price.  At the Company's option, cash (based on the market price on the
last trading date prior to the date of the exercise) will be paid instead of
issuing fractional shares of any securities (other than fractional shares of
Preferred Stock in integral multiples of one-thousandth of a share).

     No Shareholder Rights.  A Right holder, as such, has no rights as a
shareholder of the Company, including, without limitation, the right to vote or
receive dividends.

     Amendments.  Any of the provisions of the Rights Agreement (described
below) may be amended by the Board of Directors prior to the Distribution Date
without the approval of any holders of the Rights.  After the Distribution Date,
the Board of Directors may amend the Rights Agreement to cure any ambiguity, to
make changes which do not adversely affect the interests of holders of Rights
(excluding the interests of any Acquiring Person) or to shorten or lengthen any
time period under the Rights Agreement.  A majority vote of the Board of
Directors is required.

     Tax Consequences.  Although the Company believes that neither the
distribution of the Rights nor the subsequent separation of the Rights on the
Distribution Date should be taxable to the stockholders or the Company,
stockholders may, depending upon the circumstances, realize taxable income upon
the occurrence of an event described under "Mergers, Asset Sales and Self-
Dealing Transactions."

     Rights Agreement.  The terms of the Rights are set forth in a Rights
Agreement between the Company and Mellon Investor Services LLC, as Rights Agent.
A copy of the Rights Agreement is an Exhibit to Form 8-A filed with the
Securities and Exchange Commission.  A copy of the Rights Agreement is available
free of charge from the Rights Agent at the following address:

Mellon Investor Services LLC
400 S. Hope Street, 4/th/ Floor
Los Angeles, California 90071

                                      C-3
<PAGE>

This summary does not purport to be complete and is qualified in its entirety by
reference to the Rights Agreement, which is incorporated in this summary by
reference.

                                      C-4