Document:

<PAGE>   1
                                                                     EXHIBIT 4.1

VINA

COMMON STOCK

CUSIP 92719D 10 0

SEE REVERSE FOR CERTAIN DEFINITIONS

THIS IS TO CERTIFY THAT

is the owner of

fully paid and non-assessable shares, $0.0001 par value, of the COMMON STOCK of
VINA TECHNOLOGIES, INC. (hereinafter called the "Corporation"), transferable on
the books of the Corporation in person, or by duly authorized attorney, upon
surrender of this certificate properly endorsed. This certificate is not valid
until countersigned by a Transfer Agent and registered by a Registrar. WITNESS
the facsimile seal of the Corporation and the facsimile signatures of its duly
authorized officers.

Dated:
COUNTERSIGNED AND REGISTERED:
AMERICAN STOCK TRANSFER & TRUST COMPANY
(NEW YORK, N.Y.)
TRANSFER AGENT AND REGISTRAR
BY
  -------------------------------------
AUTHORIZED SIGNATURE
CHIEF FINANCIAL OFFICER AND SECRETARY
PRESIDENT AND CHIEF EXECUTIVE OFFICER<PAGE>   1

                                                                  EXHIBIT 10.1.3

                            VINA TECHNOLOGIES, INC.

                        2000 EMPLOYEE STOCK PURCHASE PLAN

                    (Adopted by the Board on May 22, 2000)

<PAGE>   2

                                Table of Contents

<TABLE>
<CAPTION>
                                                                                          Page
<S>                                                                                       <C>
SECTION 1      Purpose Of The Plan...........................................................1

SECTION 2      Definitions...................................................................1
          (a)  "Accumulation Period".........................................................1
          (b)  "Board".......................................................................1
          (c)  "Code"........................................................................1
          (d)  "Committee"...................................................................1
          (e)  "Company".....................................................................1
          (f)  "Compensation"................................................................1
          (g)  "Corporate Reorganization"....................................................1
          (h)  "Eligible Employee"...........................................................1
          (i)  "Employee"....................................................................2
          (j)  "Exchange Act"................................................................2
          (k)  "Fair Market Value"...........................................................2
          (l)  "IPO".........................................................................3
          (m)  "Offering Period".............................................................3
          (n)  "Parent"......................................................................3
          (o)  "Participant".................................................................3
          (p)  "Participating Company".......................................................3
          (q)  "Plan"........................................................................3
          (r)  "Plan Account"................................................................3
          (s)  "Purchase Price"..............................................................3
          (t)  "Stock".......................................................................3
          (u)  "Subsidiary"..................................................................3

SECTION 3      Administration Of The Plan....................................................3
          (a)  Committee Composition.........................................................3
          (b)  Committee Responsibilities....................................................3

SECTION 4      Enrollment And Participation..................................................4
          (a)  Offering Periods..............................................................4
          (b)  Accumulation Periods..........................................................4
          (c)  Enrollment....................................................................4
          (d)  Duration of Participation.....................................................4
          (e)  Applicable Offering Period....................................................4

SECTION 5      Employee Contributions........................................................5
          (a)  Frequency of Payroll Deductions...............................................5
          (b)  Amount of Payroll Deductions..................................................5
          (c)  Changing Withholding Rate.....................................................5
          (d)  Discontinuing Payroll Deductions..............................................5

SECTION 6      Withdrawal From The Plan......................................................5
          (a)  Withdrawal....................................................................5
          (b)  Re-enrollment After Withdrawal................................................5
</TABLE>

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<PAGE>   3

<TABLE>
<S>                                                                                       <C>
SECTION 7      Change In Employment Status...................................................5
          (a)  Termination of Employment.....................................................5
          (b)  Leave of Absence..............................................................6
          (c)  Death.........................................................................6

SECTION 8      Plan Accounts And Purchase Of Shares..........................................6
          (a)  Plan Accounts.................................................................6
          (b)  Purchase Price................................................................6
          (c)  Number of Shares Purchased....................................................6
          (d)  Available Shares Insufficient.................................................6
          (e)  Issuance of Stock.............................................................7
          (f)  Unused Cash Balances..........................................................7
          (g)  Stockholder Approval..........................................................7

SECTION 9      Limitations On Stock Ownership................................................7
          (a)  Five Percent Limit............................................................7
          (b)  Dollar Limit..................................................................7

SECTION 10     Rights Not Transferable.......................................................8

SECTION 11     No Rights As An Employee......................................................8

SECTION 12     No Rights As A Stockholder....................................................8

SECTION 13     Securities Law Requirements...................................................8

SECTION 14     Stock Offered Under The Plan..................................................8
          (a)  Authorized Shares.............................................................8
          (b)  Antidilution Adjustments......................................................9
          (c)  Reorganizations...............................................................9

SECTION 15     Amendment Or Discontinuance...................................................9

SECTION 16     Execution.....................................................................9
</TABLE>

                                      -ii-
<PAGE>   4

                             VINA TECHNOLOGIES, INC.

                        2000 EMPLOYEE STOCK PURCHASE PLAN

SECTION 1 Purpose Of The Plan.

        The Plan was adopted by the Board on May 22, 2000, effective as of the
date of the IPO. The purpose of the Plan is to provide Eligible Employees with
an opportunity to increase their proprietary interest in the success of the
Company by purchasing Stock from the Company on favorable terms and to pay for
such purchases through payroll deductions. The Plan is intended to qualify under
section 423 of the Code.

SECTION 2 Definitions.

        (a) "Accumulation Period" means a six-month period during which
contributions may be made toward the purchase of Stock under the Plan, as
determined pursuant to Section 4(b).

        (b) "Board" means the Board of Directors of the Company, as constituted
from time to time.

        (c) "Code" means the Internal Revenue Code of 1986, as amended.

        (d) "Committee" means a committee of the Board, as described in Section
3.

        (e) "Company" means Vina Technologies, Inc., a California corporation,
or its successor corporation, VINA Technologies, Inc., a Delaware corporation.

        (f) "Compensation" means (i) the total compensation paid in cash to a
Participant by a Participating Company, including salaries, wages, bonuses,
incentive compensation, commissions, overtime pay and shift premiums, plus (ii)
any pre-tax contributions made by the Participant under section 401(k) or 125 of
the Code. "Compensation" shall exclude all non-cash items, moving or relocation
allowances, cost-of-living equalization payments, car allowances, tuition
reimbursements, imputed income attributable to cars or life insurance, severance
pay, fringe benefits, contributions or benefits received under employee benefit
plans, income attributable to the exercise of stock options, and similar items.
The Committee shall determine whether a particular item is included in
Compensation.

        (g) "Corporate Reorganization" means:

                (i) The consummation of a merger or consolidation of the Company
        with or into another entity, or any other corporate reorganization; or

                (ii) The sale, transfer or other disposition of all or
        substantially all of the Company's assets or the complete liquidation or
        dissolution of the Company.

        (h) "Eligible Employee" means any Employee of a Participating Company
who meets both of the following requirements:

                                      -1-
<PAGE>   5

                (i) His or her customary employment is for more than five months
        per calendar year and for more than 20 hours per week; and

                (ii) He or she has been an Employee of a Participating Company
        for not less than one month.

        The foregoing notwithstanding, an individual shall not be considered an
Eligible Employee if his or her participation in the Plan is prohibited by the
law of any country which has jurisdiction over him or her or if he or she is
subject to a collective bargaining agreement that does not provide for
participation in the Plan.

        (i) "Employee" means an individual paid in a manner which results in the
issuance of a Form W-2 by the Company, a Parent or a Subsidiary, and with
respect to whom the Company, a Parent or a Subsidiary has withheld income and
employment taxes from that individual's compensation. An individual who has not
been treated as an Employee by the Company (or Parent or Subsidiary, as
applicable) in a particular period shall not be eligible to participate in the
Plan for that period, even if a government agency, court of law or any person
later determines that such individual is or was a common-law employee during all
or any portion of that period.

        (j) "Exchange Act" means the Securities Exchange Act of 1934, as
amended.

        (k) "Fair Market Value" means the market price of Stock, determined by
the Committee as follows:

                (i) If the Stock was traded over-the-counter on the date in
        question but was not traded on The Nasdaq Stock Market, then the Fair
        Market Value shall be equal to the last transaction price quoted for
        such date by the OTC Bulletin Board or, if not so quoted, shall be equal
        to the mean between the last reported representative bid and asked
        prices quoted for such date by the principal automated inter-dealer
        quotation system on which the Stock is quoted or, if the Stock is not
        quoted on any such system, by the "Pink Sheets" published by the
        National Quotation Bureau, Inc.;

                (ii) If the Stock was traded on The Nasdaq Stock Market on the
        date in question, then the Fair Market Value shall be equal to the last
        reported sale price quoted for such date by The Nasdaq Stock Market;

                (iii) If the Stock was traded on a United States stock exchange
        on the date in question, then the Fair Market Value shall be equal to
        the closing price reported for such date by the applicable
        composite-transactions report; and

                (iv) If none of the foregoing provisions is applicable, then the
        Fair Market Value shall be determined by the Committee in good faith on
        such basis as it deems appropriate.

        In all cases, the determination of Fair Market Value by the Committee
shall be conclusive and binding on all persons.

                                      -2-
<PAGE>   6

        (l) "IPO" means the initial offering of Stock to the public pursuant to
a registration statement filed by the Company with the Securities and Exchange
Commission.

        (m) "Offering Period" means a 24-month period with respect to which the
right to purchase Stock may be granted under the Plan, as determined pursuant to
Section 4(a).

        (n) "Parent" means any corporation (other than the Company) in an
unbroken chain of corporations ending with the Company, if each of the
corporations other than the Company owns stock possessing 50% or more of the
total combined voting power of all classes of stock in one of the other
corporations in such chain. A corporation that attains the status of a Parent on
a date after the adoption of the Plan shall be a Parent commencing as of such
date.

        (o) "Participant" means an Eligible Employee who elects to participate
in the Plan, as provided in Section 4(c).

        (p) "Participating Company" means (i) the Company and (ii) each present
or future Subsidiary designated by the Committee as a Participating Company.

        (q) "Plan" means this VINA Technologies, Inc. 2000 Employee Stock
Purchase Plan, as it may be amended from time to time.

        (r) "Plan Account" means the account established for each Participant
pursuant to Section 8(a).

        (s) "Purchase Price" means the price at which Participants may purchase
Stock under the Plan, as determined pursuant to Section 8(b).

        (t) "Stock" means the Common Stock of the Company.

        (u) "Subsidiary" means any corporation (other than the Company) in an
unbroken chain of corporations beginning with the Company, if each of the
corporations other than the last corporation in the unbroken chain owns stock
possessing 50% or more of the total combined voting power of all classes of
stock in one of the other corporations in such chain.

SECTION 3 Administration Of The Plan.

        (a) Committee Composition. The Plan shall be administered by the
Committee. The Committee shall consist exclusively of one or more directors of
the Company, who shall be appointed by the Board.

        (b) Committee Responsibilities. The Committee shall interpret the Plan
and make all other policy decisions relating to the operation of the Plan. The
Committee may adopt such rules, guidelines and forms as it deems appropriate to
implement the Plan. The Committee's determinations under the Plan shall be final
and binding on all persons.

                                      -3-
<PAGE>   7

SECTION 4 Enrollment And Participation.

        (a) Offering Periods. While the Plan is in effect, two Offering Periods
shall commence in each calendar year. The Offering Periods shall consist of the
24-month periods commencing on each February 1 and August 1, except that the
first Offering Period shall commence on the date of the IPO and end on July 31,
2002.

        (b) Accumulation Periods. While the Plan is in effect, two Accumulation
Periods shall commence in each calendar year. The Accumulation Periods shall
consist of the six month periods commencing on February 1 and August 1, except
that the first Accumulation Period shall commence on the date of the IPO and end
on January 31, 2001.

        (c) Enrollment. Any individual who, on the day preceding the first day
of an Offering Period, qualifies as an Eligible Employee may elect to become a
Participant in the Plan for such Offering Period by executing the enrollment
form prescribed for this purpose by the Committee. The enrollment form shall be
filed with the Company at the prescribed location not later than 15 days prior
to the commencement of such Offering Period.

        (d) Duration of Participation. Once enrolled in the Plan, a Participant
shall continue to participate in the Plan until he or she ceases to be an
Eligible Employee, withdraws from the Plan under Section 6(a) or reaches the end
of the Offering Period in which his or her employee contributions were
discontinued under Section 5(d) or 9(b). A Participant who discontinued employee
contributions under Section 5(d) or 9(b) or withdrew from the Plan under Section
6(a) may again become a Participant, if he or she then is an Eligible Employee,
by following the procedure described in Subsection (c) above. A Participant
whose employee contributions were discontinued automatically under Section 9(b)
shall automatically resume participation at the beginning of the earliest
Offering Period ending in the next calendar year, if he or she then is an
Eligible Employee.

        (e) Applicable Offering Period. For purposes of calculating the purchase
price under Section 8(b), the applicable Offering Period shall be determined as
follows:

                (i) Once a Participant is enrolled in the Plan for an Offering
        Period, such Offering Period shall continue to apply to him or her until
        the earliest of: (A) the end of such Offering Period or (B) the end of
        his or her participation under Subsection (d) above.

                (ii) When a Participant reaches the end of an Offering Period
        but his or her participation is to continue, then such Participant shall
        automatically be re-enrolled for the Offering Period that commences
        immediately after the end of the prior Offering Period.

                                      -4-
<PAGE>   8

SECTION 5 Employee Contributions.

        (a) Frequency of Payroll Deductions. A Participant may purchase shares
of Stock under the Plan solely by means of payroll deductions. Payroll
deductions, as designated by the Participant pursuant to Subsection (b) below,
shall occur on each payday during participation in the Plan.

        (b) Amount of Payroll Deductions. An Eligible Employee shall designate
on the enrollment form the portion of his or her Compensation that he or she
elects to have withheld for the purchase of Stock. Such portion shall be a whole
percentage of the Eligible Employee's Compensation, but not less than 1% nor
more than 10%.

        (c) Changing Withholding Rate. If a Participant wishes to change the
rate of payroll withholding, he or she may do so by filing a new enrollment form
with the Company at the prescribed location at any time. The new withholding
rate shall be effective as soon as reasonably practicable after such form has
been received by the Company. The new withholding rate shall be a whole
percentage of the Eligible Employee's Compensation, but not less than 1% nor
more than 10%. No Participant shall make more than two (2) changes under this
Section 5(c) during any Offering Period. No rate change during any Offering
Period may exceed the withholding rate originally designated at the beginning
of such Offering Period.

        (d) Suspending Payroll Deductions. If a Participant wishes to
suspend employee contributions entirely, he or she may do so by filing the
proper form with the Company at the prescribed location at any time. Payroll
withholding shall cease as soon as reasonably practicable after such form has
been received by the Company. Any Participant's contributions made prior to such
election shall remain in the Participant's Plan Account. If the Offering Period
in which the Participant suspends contributions is still in effect, the
Participant may re-enroll at the commencement of any Accumulation Period within
that Offering Period. In all other cases, the Participant may re-enroll
effective at the commencement of a subsequent Offering Period.

SECTION 6 Withdrawal From The Plan.

        (a) Withdrawal. A Participant may elect to withdraw from the Plan by
filing the prescribed form with the Company at the prescribed location at any
time before the last day of an Accumulation Period. As soon as reasonably
practicable thereafter, payroll deductions shall cease and the entire amount
credited to the Participant's Plan Account shall be refunded to him or her in
cash, without interest. No partial withdrawals shall be permitted.

        (b) Re-enrollment After Withdrawal. A former Participant who has
withdrawn from the Plan shall not be a Participant until he or she re-enrolls in
the Plan under Section 4(c); provided, however, that re-enrollment will be
effective only at the commencement of an Offering Period which begins at least
six months after the date of withdrawal.

SECTION 7 Change In Employment Status.

        (a) Termination of Employment. Termination of employment as an Eligible
Employee for any reason, including death, shall be treated as an automatic
withdrawal from the Plan under Section 6(a). (A transfer from one Participating
Company to another shall not be treated as a termination of employment.)

                                      -5-
<PAGE>   9

        (b) Leave of Absence. For purposes of the Plan, employment shall not be
deemed to terminate when the Participant goes on a military leave, a sick leave
or another bona fide leave of absence, if the leave was approved by the Company
in writing. Employment, however, shall be deemed to terminate 90 days after the
Participant goes on a leave, unless a contract or statute guarantees his or her
right to return to work. Employment shall be deemed to terminate in any event
when the approved leave ends, unless the Participant immediately returns to
work.

        (c) Death. In the event of the Participant's death, the amount credited
to his or her Plan Account shall be paid to a beneficiary designated by him or
her for this purpose on the prescribed form or, if none, to the Participant's
estate. Such form shall be valid only if it was filed with the Company at the
prescribed location before the Participant's death.

SECTION 8 Plan Accounts And Purchase Of Shares.

        (a) Plan Accounts. The Company shall maintain a Plan Account on its
books in the name of each Participant. Whenever an amount is deducted from the
Participant's Compensation under the Plan, such amount shall be credited to the
Participant's Plan Account. Amounts credited to Plan Accounts shall not be trust
funds and may be commingled with the Company's general assets and applied to
general corporate purposes. No interest shall be credited to Plan Accounts.

        (b) Purchase Price. The Purchase Price for each share of Stock purchased
at the close of an Accumulation Period shall be the lower of:

                (i) 85% of the Fair Market Value of such share on the last
        trading day in such Accumulation Period; or

                (ii) 85% of the Fair Market Value of such share on the last
        trading day before the commencement of the applicable Offering Period
        (as determined under Section 4(e) or, in the case of the first Offering
        Period under the Plan, 85% of the price at which one share of Stock is
        offered to the public in the IPO.

        (c) Number of Shares Purchased. As of the last day of each Accumulation
Period, each Participant shall be deemed to have elected to purchase the number
of shares of Stock calculated in accordance with this Subsection (c), unless the
Participant has previously elected to withdraw from the Plan in accordance with
Section 6(a). The amount then in the Participant's Plan Account shall be divided
by the Purchase Price, and the number of shares that results shall be purchased
from the Company with the funds in the Participant's Plan Account. The foregoing
notwithstanding, no Participant shall purchase more than five thousand (5,000)
shares of Stock with respect to any Accumulation Period nor more than the
amounts of Stock set forth in Sections 9(b) and 14(a). The Committee may
determine with respect to all Participants that any fractional share, as
calculated under this Subsection (c), shall be (i) rounded down to the next
lower whole share or (ii) credited as a fractional share.

        (d) Available Shares Insufficient. In the event that the aggregate
number of shares that all Participants elect to purchase during an Accumulation
Period exceeds the maximum number of shares remaining available for issuance
under Section 14(a), then the number of shares to which each Participant is
entitled shall be determined by multiplying the number of

                                      -6-
<PAGE>   10

shares available for issuance by a fraction, the numerator of which is the
number of shares that such Participant has elected to purchase and the
denominator of which is the number of shares that all Participants have elected
to purchase.

        (e) Issuance of Stock. Certificates representing the shares of Stock
purchased by a Participant under the Plan shall be issued to him or her as soon
as reasonably practicable after the close of the applicable Accumulation Period,
except that the Committee may determine that such shares shall be held for each
Participant's benefit by a broker designated by the Committee (unless the
Participant has elected that certificates be issued to him or her). Shares may
be registered in the name of the Participant or jointly in the name of the
Participant and his or her spouse as joint tenants with right of survivorship or
as community property.

        (f) Unused Cash Balances. An amount remaining in the Participant's Plan
Account that represents the Purchase Price for any fractional share shall be
carried over in the Participant's Plan Account to the next Accumulation Period.
Any amount remaining in the Participant's Plan Account that represents the
Purchase Price for whole shares that could not be purchased by reason of
Subsection (c) above, Section 9(b) or Section 14(a) shall be refunded to the
Participant in cash, without interest.

        (g) Stockholder Approval. Any other provision of the Plan
notwithstanding, no shares of Stock shall be purchased under the Plan unless and
until the Company's stockholders have approved the adoption of the Plan.

SECTION 9 Limitations On Stock Ownership.

        (a) Five Percent Limit. Any other provision of the Plan notwithstanding,
no Participant shall be granted a right to purchase Stock under the Plan if such
Participant, immediately after his or her election to purchase such Stock, would
own stock possessing more than 5% of the total combined voting power or value of
all classes of stock of the Company or any parent or Subsidiary of the Company.
For purposes of this Subsection (a), the following rules shall apply:

                (i) Ownership of stock shall be determined after applying the
        attribution rules of section 424(d) of the Code;

                (ii) Each Participant shall be deemed to own any stock that he
        or she has a right or option to purchase under this or any other plan;
        and

                (iii) Each Participant shall be deemed to have the right to
        purchase five thousand (5,000) shares of Stock under this Plan with
        respect to each Accumulation Period.

        (b) Dollar Limit. Any other provision of the Plan notwithstanding, no
Participant shall purchase Stock with a Fair Market Value in excess of the
following limit:

        Any other provision of the Plan notwithstanding, no Participant shall
purchase Stock with a Fair Market Value in excess of $25,000 per calendar year
(under this Plan and all other employee stock purchase plans of the Company or
any parent or Subsidiary of the Company).

                                      -7-
<PAGE>   11

        For purposes of this Subsection (b), the Fair Market Value of Stock
shall be determined in each case as of the beginning of the Offering Period in
which such Stock is purchased. Employee stock purchase plans not described in
section 423 of the Code shall be disregarded. If a Participant is precluded by
this Subsection (b) from purchasing additional Stock under the Plan, then his or
her employee contributions shall automatically be discontinued and shall resume
at the beginning of the earliest Accumulation Period ending in the next calendar
year (if he or she then is an Eligible Employee).

SECTION 10 Rights Not Transferable.

        The rights of any Participant under the Plan, or any Participant's
interest in any Stock or moneys to which he or she may be entitled under the
Plan, shall not be transferable by voluntary or involuntary assignment or by
operation of law, or in any other manner other than by beneficiary designation
or the laws of descent and distribution. If a Participant in any manner attempts
to transfer, assign or otherwise encumber his or her rights or interest under
the Plan, other than by beneficiary designation or the laws of descent and
distribution, then such act shall be treated as an election by the Participant
to withdraw from the Plan under Section 6(a).

SECTION 11 No Rights As An Employee.

        Nothing in the Plan or in any right granted under the Plan shall confer
upon the Participant any right to continue in the employ of a Participating
Company for any period of specific duration or interfere with or otherwise
restrict in any way the rights of the Participating Companies or of the
Participant, which rights are hereby expressly reserved by each, to terminate
his or her employment at any time and for any reason, with or without cause.

SECTION 12 No Rights As A Stockholder.

        A Participant shall have no rights as a stockholder with respect to any
shares of Stock that he or she may have a right to purchase under the Plan until
such shares have been purchased on the last day of the applicable Offering
Period.

SECTION 13 Securities Law Requirements.

        Shares of Stock shall not be issued under the Plan unless the issuance
and delivery of such shares comply with (or are exempt from) all applicable
requirements of law, including (without limitation) the Securities Act of 1933,
as amended, the rules and regulations promulgated thereunder, state securities
laws and regulations, and the regulations of any stock exchange or other
securities market on which the Company's securities may then be traded.

SECTION 14 Stock Offered Under The Plan.

        (a) Authorized Shares. The maximum aggregate number of shares of Stock
available for purchase under the Plan is one million (1,000,000), plus an annual
increase to be added on the first day of the Company's fiscal year beginning in
2001 equal to the lesser of (i) eighty thousand (80,000) shares, (ii) 1% of the
outstanding shares on such date or (iii) a lesser amount determined by the
Board. The aggregate number of Shares available for purchase under the Plan
shall at all times be subject to adjustment pursuant to Section 14.

                                      -8-
<PAGE>   12

        (b) Antidilution Adjustments. The aggregate number of shares of Stock
offered under the Plan, the five thousand (5,000) share limitation described in
Section 8(c) and the price of shares that any Participant has elected to
purchase shall be adjusted proportionately by the Committee for any increase or
decrease in the number of outstanding shares of Stock resulting from a
subdivision or consolidation of shares or the payment of a stock dividend, any
other increase or decrease in such shares effected without receipt or payment of
consideration by the Company, the distribution of the shares of a Subsidiary to
the Company's stockholders or a similar event.

        (c) Reorganizations. Any other provision of the Plan notwithstanding,
immediately prior to the effective time of a Corporate Reorganization, the
Offering Period then in progress shall terminate and shares shall be purchased
pursuant to Section 8, unless the Plan is assumed by the surviving corporation
or its parent corporation pursuant to the plan of merger or consolidation. The
Plan shall in no event be construed to restrict in any way the Company's right
to undertake a dissolution, liquidation, merger, consolidation or other
reorganization.

SECTION 15 Amendment Or Discontinuance.

        The Board shall have the right to amend, suspend or terminate the Plan
at any time and without notice. Except as provided in Section 14, any increase
in the aggregate number of shares of Stock to be issued under the Plan shall be
subject to approval by a vote of the stockholders of the Company. In addition,
any other amendment of the Plan shall be subject to approval by a vote of the
stockholders of the Company to the extent required by an applicable law or
regulation.

SECTION 16 Execution.

        To record the adoption of the Plan by the Board on May 22, 2000, the
Company has caused its authorized officer to execute the same.

                                            VINA Technologies, Inc.

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

                                            Name:
                                                 -------------------------------

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

                                      -9-

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