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                                                                   EXHIBIT 10.28

                          LEASE AMENDMENT AGREEMENT #3

This Lease Amendment Agreement #3 ("Amendment") is made and entered into this 23
day of March 2001 by and between Mission West Properties, L.P. II, a Delaware
limited partnership ("Lessor") and Gadzoox Networks, Inc., a Delaware
corporation ("Lessee").

                                    RECITALS

A.   Lessee currently leases from Lessor approximately 64,805 square feet of
     space located at 5850 Hellyer Avenue, San Jose, California ("Phase I" and
     "Phase II") pursuant to that certain lease dated August 13, 1998 and
     Amended under Lease Amendment Agreement #1 dated December 30, 1998 and
     Lease Amendment Agreement #2 dated April 30, 2000 (collectively referred to
     herein as the "Lease"). Lessee agreed to lease approximately 73,312 square
     feet at 5750 Hellyer Avenue ("Phase III") under Lease Amendment Agreement #
     2(the "Phase III Premises").

B.   Lessee has elected and Lessor has agreed to amend the Lease subject to the
     terms and conditions set forth herein.

NOW, THEREFORE, for good and valuable consideration, the receipt and sufficiency
of which are acknowledged, the parties hereto agree to amend the Lease as
follows:

     1.   Lessee has advised Lessor that Lessee does not require the use of the
          Phase III Premises, and wishes to Sublease or otherwise dispose of the
          Phase III Premises. Lessor hereby agrees to seek a replacement tenant
          to directly lease the Phase III Premises.

     2.   Lessor will not cancel Lease on Phase III until a suitable tenant is
          obtained at equal or higher rent and similar terms. Lessor will not
          unreasonably withhold its consent to a proposed replacement tenant or
          tenants for the Phase III Premises. Upon the execution of a direct
          lease to a new tenant, (i) Lease Amendment #2 shall be cancelled in
          its entirety, and its provisions shall be void ab inititio and (ii)
          Lessee shall be released of its obligations under the Lease for the
          Phase III premises, effective as of the commencement of such lease.
          Lessor hereby confirms that any and all obligations of Lessee to issue
          to Lessor the warrant described in Paragraph 13 of Lease Amendment #2
          are hereby terminated.

     3.   Lessor will finish the basic shell building on approximately May 1,
          2001. Lessee Improvements will take approximately 75 to 90 days.
          However, Lessor cannot start Lessee Improvements until a tenant is
          obtained. The new tenant will need 30 to 60 days to get their plans
          ready for construction.

     4.   Lessor will make every reasonable effort to rent Phase III as soon as
          possible, but advises Lessee that a very weak market exists in the
          Silicon Valley at this time. Lessor will split building for two
          tenants on Lessee's request.

     5.   The following are Lessor's terms for using its best efforts to lease
          Phase III to a new tenant:

          a.   Rent on the basic shell at $113,344 per month, plus property
               taxes and insurance and gardening, will commence on August 1,
               2001 and will continue until the building is occupied (or a
               replacement tenant has commenced paying rent, if sooner).

          b.   Lessee will give Lessor a warrant for 50,000 shares of Gadzoox
               stock for 3 years at $3.00/share as of execution of this
               Agreement on standard warrant terms with a net exercise option.
               Lessee will give Lessor an additional warrant for 50,000 shares
               of Gadzoox stock for 3 years at $3.00/share as a "success fee" if
               Lessor is able to lease Phase III for a net loss to Lessee of
               $300,000 or less.

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          c.   Lessor may owe a commission to B.T. Commercial ("B.T."") as a
               consequence of Lease Amendment Agreement #2. Lessor will attempt
               to get such commission waived by B.T. Lessee and Lessor will
               split evenly the cost of any commission due to B.T. Commercial if
               Lessor is unable to get said commission waived. Lessor represents
               that the total maximum exposure to B.T. Commercial is $126,500.
               The commercially reasonable commission on new lease must be
               covered by higher new rental rate. d. The unapplied balance of
               the Security Deposit of $166,712 will be promptly refunded to
               Lessee upon a replacement tenant entering the Premises or
               commencing the payment of rent.

     6.   AUTHORITY: Each party executing this Amendment represents and warrants
          that he or she is duly authorized to execute and deliver this
          Amendment. If executed on behalf of a corporation, that this Amendment
          is executed in accordance with the by-laws of said corporation (or a
          partnership that this Amendment is executed in accordance with the
          partnership agreement of such partnership), that no other party's
          approval or consent to such execution and delivery is required, and
          that this Amendment is binding upon said individual, corporation (or
          partnership) as the case may be in accordance with its terms.

     7.   RATIFICATION OF LEASE: Except as modified herein, the Lease is hereby
          ratified, approved and confirmed upon all the terms, covenants, and
          conditions.

     MISSION WEST PROPERTIES, L.P.II           GADZOOX NETWORKS, INC.
     a Delaware limited partnership            a Delaware corporation
     By: Mission West Properties, Inc. G.P.

     By:                                       By:
        --------------------------------          -----------------------------
                  Carl E. Berg                            Michael Parides

     Title: President of General Partner       Title: Chief Executive Officer
           -----------------------------             --------------------------

     Date:                                     Date:
           -----------------------------             --------------------------

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                                                                   EXHIBIT 10.29

                             GADZOOX NETWORKS, INC.

                           CHANGE OF CONTROL AGREEMENT

        This Change of Control Agreement (the "AGREEMENT") is made and entered
into effective as of March 30, 2001 (the "EFFECTIVE DATE"), by and between Ed
Turner (the "EMPLOYEE") and Gadzoox Networks, Inc., a Delaware corporation (the
"COMPANY").

                                 R E C I T A L S

        A. The Board of Directors of the Company (the "BOARD") expects that the
Company may from time to time consider the possibility of an acquisition of the
Company by another company or other Change of Control (as that term is defined
in Section 2 hereof) of the Company. The Board recognizes that such
considerations can be a distraction to the Employee and can cause the Employee
to consider alternative employment opportunities.

        B. The Board believes that it is in the best interests of the Company
and for the benefit of its shareholders to provide the Employee with an
incentive to continue his employment and to maximize the value of the Company
upon a Change of Control.

                                    AGREEMENT

        NOW, THEREFORE, in consideration of the mutual covenants herein
contained, and in consideration of the continuing employment of the Employee by
the Company, the parties agree as follows:

        1.     EMPLOYMENT.

               (a) Position. The Company has and continues to employ the
Employee in the position of Vice President, Solutions and Strategic Alliances
with such duties, responsibilities and compensation as are in effect as of the
Effective Date; provided, however, that this Agreement shall not in any manner
restrict the Company in its employment relationship with the Employee prior to
the occurrence of a Change of Control, including revising such duties,
responsibilities or compensation from time to time.

               (b) At-Will Employment. The Company and the Employee acknowledge
that the Employee's employment is and shall continue to be at-will, as defined
under applicable law. If the Employee's employment terminates for any reason,
this Agreement shall not entitle the Employee to any payment, benefit, damage,
award or compensation other than as specifically provided by this Agreement.

        2. TERMINATION FOLLOWING A CHANGE OF CONTROL. If a Change of Control
occurs while the Employee is employed by the Company, then, subject to SECTIONS
3 AND 4 hereof, twenty-five percent (25%) of the number of all stock options and
restricted stock owned beneficially by the Employee and which are, in the case
of stock options, unvested and, in the case of restricted stock, subject to a
repurchase option, as of the effective date of the Change of Control, shall on
the

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effective date of the Change of Control be fully vested (and immediately
exercisable) and any such repurchase option shall cease to apply to such
restricted stock, regardless of whether or not the Employee's employment with
the Company continues following the effective date of the Change of Control. The
balance of any unvested stock options or restricted stock subject to a
repurchase option not so accelerated shall continue to vest on the same schedule
that existed prior to the Change of Control with respect to such options or
stock. The term "CHANGE OF CONTROL" means the occurrence of any of the
following: (A) when any "person," as such term is used in Sections 13(d) and
14(d) of the Securities Exchange Act of 1934, as amended (the "EXCHANGE ACT"),
other than the Company, a subsidiary of the Company or a Company employee
benefit plan, including any trustee of such plan acting as trustee, is or
becomes the "beneficial owner" (as defined in Rule 13d-3 under the Exchange
Act), directly or indirectly, of securities of the Company representing fifty
percent (50%) or more of the combined voting power of the Company's then
outstanding securities entitled to vote generally in the election of directors;
provided, however, that sales by the Company of its equity securities shall not
constitute a Change of Control; or (B) the effective date of a merger or
consolidation of the Company with any other third party, other than a merger or
consolidation which would result in the voting securities of the Company
outstanding immediately prior thereto continuing to represent (either by
remaining outstanding or by being converted into voting securities of the
surviving entity or the entity that controls such surviving entity) at least
fifty percent (50%) of the total voting power represented by the voting
securities of the Company, such surviving entity or the entity that controls
such surviving entity outstanding immediately after such merger or
consolidation, or the effective date of the sale or disposition by the Company
of all or substantially all the Company's assets.

        3. LIMITATION ON PAYMENTS. If the benefits provided for in this
Agreement to the Employee (i) constitute a "parachute payment(s)" within the
meaning of SECTION 280G of the Internal Revenue Code of 1986, as amended (the
"CODE") and (ii) but for this Section, would be subject to the excise tax
imposed by SECTION 4999 of the Code, then the Employee's severance benefits
under SECTION 2 shall be payable either:

               (a) in full; or

               (b) as to such lesser amount which would result in no portion of
such severance benefits being subject to excise tax under SECTION 4999 of the
Code,

whichever of the foregoing amounts, taking into account the applicable federal,
state and local income taxes and the excise tax imposed by SECTION 4999, results
in the receipt by the Employee on an after-tax basis, of the greatest amount of
severance benefits under SECTION 2 hereof, notwithstanding that all or some
portion of such severance benefits may be taxable under SECTION 4999 of the
Code. Unless the Company and the Employee otherwise agree in writing, any
determination required under this SECTION 3 shall be made in writing by the
Company's independent public accountants (the "Accountants"), whose
determination shall be conclusive and binding upon the Employee and the Company
for all purposes. For purposes of making the calculations required by this
SECTION 3, the Accountants may make reasonable assumptions and approximations
concerning applicable taxes and may rely on reasonable, good faith
interpretations concerning the application of SECTIONS 280G AND 4999 of the
Code. The Company and the Employee shall furnish to the Accountants such
information and documents as the Accountants may reasonably request in

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order to make a determination under this Section. The Company shall bear all
costs the Accountants may reasonably incur in connection with any calculations
contemplated by this SECTION 3.

        4. CERTAIN BUSINESS COMBINATIONS. If the Board determines, upon receipt
of a written opinion of the Company's independent public accountants, that the
enforcement of any provision of this Agreement would preclude accounting for any
proposed business combination of the Company involving a Change of Control as a
pooling of interests, and the Board otherwise determines to approve such a
proposed business transaction which requires as a condition to the closing of
such transaction that it be accounted for as a pooling of interests, then any
such provision of this Agreement shall be null and void.

        5. SUCCESSORS AND ASSIGNS. The Company may assign any of its rights
under this Agreement to single or multiple assignees, and this Agreement shall
inure to the benefit of the successors and assigns of the Company. This
Agreement shall be binding upon the Employee and his heirs, executors,
administrators and assigns.

        6. NOTICE. Notices and all other communications contemplated by this
Agreement shall be in writing and shall be deemed to have been duly given when
personally delivered or when mailed by U.S. registered or certified mail, return
receipt requested and postage prepaid. In the case of the Employee, mailed
notices shall be addressed to him at the home address which he most recently
communicated to the Company in writing. In the case of the Company, mailed
notices shall be addressed to its corporate headquarters, and all notices shall
be directed to the attention of its Secretary.

        7.     ARBITRATION.

               (a) General. In consideration of Employee's service to the
Company and Employee's receipt of the compensation, pay raises and other
benefits paid to Employee by the Company, at present and in the future, Employee
agrees that any and all controversies, claims, or disputes with anyone
(including the Company and any employee, officer, director, shareholder or
benefit plan of the Company in their capacity as such or otherwise) arising out
of, relating to, or respecting this Agreement, shall be subject to binding
arbitration under the Arbitration Rules set forth in California Code of Civil
Procedure SECTION 1280 through 1294.2, including SECTION 1283.05 (the "RULES")
and pursuant to California law.

               (b) Procedure. Employee agrees that any arbitration will be
administered by the American Arbitration Association ("AAA") and that a neutral
arbitrator will be selected in a manner consistent with its National Rules for
the Resolution of Employment Disputes. The arbitration proceedings will allow
for discovery according to the rules set forth in the National Rules for the
Resolution of Employment Disputes or California Code of Civil Procedure.
Employee agrees that the arbitrator shall have the power to decide any motions
brought by any party to the arbitration, including motions for summary judgment
and/or adjudication and motions to dismiss and demurrers, prior to any
arbitration hearing. Employee agrees that the arbitrator shall issue a written
decision on the merits. Employee also agrees that the arbitrator shall have the
power to award any remedies, including attorneys' fees and costs, available
under applicable law. Employee understands the Company will pay for any
administrative or hearing fees charged by the arbitrator or AAA except

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that Employee shall pay the first $200.00 of any filing fees associated with any
arbitration Employee initiates. Employee agrees that the arbitrator shall
administer and conduct any arbitration in a manner consistent with the Rules and
that to the extent that the AAA's National Rules for the Resolution of
Employment Disputes conflict with the Rules, the Rules shall take precedence.

               (c) Remedy. Except as provided by the Rules, arbitration shall be
the sole, exclusive and final remedy for any dispute between Employee and the
Company. Accordingly, except as provided for by the Rules, neither Employee nor
the Company will be permitted to pursue court action regarding claims that are
subject to arbitration. Notwithstanding, the arbitrator will not have the
authority to disregard or refuse to enforce any lawful Company policy, and the
arbitrator shall not order or require the Company to adopt a policy not
otherwise required by law which the Company has not adopted.

               (d) Administrative Relief. Employee understands that this
Agreement does not prohibit Employee from pursuing an administrative claim with
a local, state or federal administrative body such as the Department of Fair
Employment and Housing, the Equal Employment Opportunity Commission or the
workers' compensation board. This Agreement does, however, preclude Employee
from pursuing court action regarding any such claim.

               (e) Voluntary Nature of Agreement. Employee acknowledges and
agrees that Employee is executing this Agreement voluntarily and without any
duress or undue influence by the Company or anyone else. Employee further
acknowledges and agrees that Employee has carefully read this Agreement and that
Employee has asked any questions needed for Employee to understand the terms,
consequences and binding effect of this Agreement and fully understand it,
including that Employee is waiving Employee's right to a jury trial. Finally,
Employee agrees that Employee has been provided an opportunity to seek the
advice of an attorney of Employee's choice before signing this Agreement.

        8.     MISCELLANEOUS PROVISIONS.

               (a) Waiver. No provision of this Agreement shall be modified,
waived or discharged unless the modification, waiver or discharge is agreed to
in writing and signed by the Employee and by an authorized officer of the
Company (other than the Employee). No waiver by either party of any breach of,
or of compliance with, any condition or provision of this Agreement by the other
party shall be considered a waiver of any other condition or provision or of the
same condition or provision at another time.

               (b) Entire Agreement. No agreements, representations or
understandings (whether oral or written and whether express or implied) which
are not expressly set forth in this Agreement have been made or entered into by
either party with respect to the subject matter hereof.

               (c) Governing Law. The validity, interpretation, construction and
performance of this Agreement shall be governed by the laws of the State of
California.

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               (d) Severability. The invalidity or unenforceability of any
provision or provisions of this Agreement shall not affect the validity or
enforceability of any other provision hereof, which shall remain in full force
and effect.

               (e) No Assignment of Benefits. The rights of any person to any
benefit under this Agreement shall not be made subject to option or assignment,
either by voluntary or involuntary assignment or by operation of law, including
(without limitation) bankruptcy, garnishment, attachment or other creditor's
process, and any action in violation of this SECTION (e) shall be void.

               (f) Taxes. All payments made pursuant to this Agreement will be
subject to withholding of applicable income and employment taxes.

               (g) Assignment by Company. The Company may assign its rights
under this Agreement to an affiliate, and an affiliate may assign its rights
under this Agreement to another affiliate of the Company or to the Company. In
the case of any such assignment, the term "Company" when used in a section of
this Agreement shall mean the corporation that actually employs the Employee.

               (h) Counterparts. This Agreement may be executed in counterparts,
each of which shall be deemed an original, but all of which together will
constitute one and the same instrument.

                             [Signatures to follow.]

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        IN WITNESS WHEREOF, each of the parties has executed this Agreement, in
the case of the Company by its duly authorized officer, as of the day and year
first above written.

COMPANY:                                GADZOOX NETWORKS, INC.

                                        By:
                                               ---------------------------------

                                        Title:
                                               ---------------------------------

EMPLOYEE:

                                        ----------------------------------------
                                        Ed Turner

                [Signature page to Change of Control Agreement.]

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