Exhibit 3.1

                              RESTATED AND AMENDED

                          CERTIFICATE OF INCORPORATION

                                       OF

                      BROCADE COMMUNICATIONS SYSTEMS, INC.

       Brocade Communications Systems, Inc., a corporation organized and
existing under the laws of the State of Delaware, hereby certifies as follows:

       A. The name of the corporation is Brocade Communications Systems, Inc.
The corporation was originally incorporated under the same name and the original
Certificate of Incorporation of the corporation was filed with the Secretary of
State of the State of Delaware on February 11, 1999.

       B. This Certificate of Incorporation has been duly adopted in accordance
with the provisions of the General Corporation Law of the State of Delaware by
the Board of Directors and the Stockholders of the corporation.

       C. Pursuant to Sections 242 and 245 of the General Corporation Law of the
State of Delaware, this Certificate of Incorporation restates and integrates and
further amends the provisions of the Certificate of Incorporation of this
corporation.

       D. The text of the Certificate of Incorporation is hereby amended and
restated in its entirety to read as follows:




                                    ARTICLE I

       The name of the corporation is Brocade Communications Systems, Inc.

                                   ARTICLE II

       The address of the Company's registered office in the State of Delaware
is 1209 Orange Street, in the City of Wilmington, Delaware 19801, County of New
Castle. The name of its registered agent at such address is The Corporation
Trust Company.

                                   ARTICLE III

       The nature of the business or purposes to be conducted or promoted by the
Company is to engage in any lawful act or activity for which corporations may be
organized under the General Corporation Law of Delaware.

                                   ARTICLE IV

       1. Authorized Capital. The Company is authorized to issue two classes of
shares of stock to be designated, respectively, Common Stock, $.001 par value,
and Preferred Stock, $0.001 par value. The total number of shares that the
Company is authorized to issue is 805,000,000 shares. The number of shares of
Common Stock authorized is 800,000,000. The number of shares of Preferred Stock
authorized is 5,000,000. The Preferred Stock may be issued from time to time in
one or more series pursuant to a resolution or resolutions providing for such
issue duly adopted by the Board of Directors (authority to do so being hereby
expressly vested in the Board). The Board of Directors is further authorized to
determine or alter the rights, preferences, privileges and restrictions granted
to or imposed upon any wholly unissued series of Preferred Stock and to fix the
number of shares of any series of Preferred Stock and the designation of any
such series of Preferred Stock. The Board of Directors, within the limits and
restrictions stated in any resolution or resolutions of the Board of Directors
originally fixing the number of shares constituting any series, may increase or
decrease (but not below the number of shares in any such series then
outstanding), the number of shares of any series subsequent to the issue of
shares of that series.

                                    ARTICLE V

       The Company is to have perpetual existence.

                                   ARTICLE VI

       Elections of directors need not be by written ballot unless a stockholder
demands election by written ballot at the meeting and before voting begins or
unless the Bylaws of the Company shall so provide.




                                   ARTICLE VII

       1. The management of the business and the conduct of the affairs of the
Company shall be vested in its Board of Directors. The number of directors which
constitute the whole Board of Directors of the Company shall be designated in
the Bylaws of the Company.

       2. The Board of Directors shall be divided into three classes designated
as Class I, Class II and Class III, respectively. Directors shall be assigned to
each class in accordance with a resolution or resolutions adopted by the Board
of Directors. At the first annual meeting of stockholders following the date
hereof, the term of office of the Class I directors shall expire and Class I
directors shall be elected for a full term of three years. At the second annual
meeting of stockholders following the date hereof, the term of office of the
Class II directors shall expire and Class II directors shall be elected for a
full term of three years. At the third annual meeting of stockholders following
the date hereof, the term of office of the Class III directors shall expire and
Class III directors shall be elected for a full term of three years. At each
succeeding annual meeting of stockholders, directors shall be elected for a full
term of three years to succeed the directors of the class whose terms expire at
such annual meeting.

       3. Notwithstanding the foregoing provisions of this Article, each
director shall serve until his or her successor is duly elected and qualified or
until his or her death, resignation or removal. No decrease in the number of
directors constituting the Board of Directors shall shorten the term of any
incumbent director.

       4. Any vacancies on the Board of Directors resulting from death,
resignation, disqualification, removal, or other causes shall be filled by
either (i) the affirmative vote of the holders of a majority of the voting power
of the then-outstanding shares of voting stock of the corporation entitled to
vote generally in the election of directors ("Voting Stock") voting together as
a single class; or (ii) by the affirmative vote of a majority of the remaining
directors then in office, even though less than a quorum of the Board of
Directors. Newly created directorships resulting from any increase in the number
of directors shall, unless the Board of Directors determines by resolution that
any such newly created directorship shall be filled by the stockholders, be
filled only by the affirmative vote of the directors then in office, even though
less than a quorum of the Board of Directors. Any director elected in accordance
with the preceding sentence shall hold office for the remainder of the full term
of the class of directors in which the new directorship was created or the
vacancy occurred and until such director's successor shall have been elected and
qualified.

       5. The affirmative vote of sixty-six and two-thirds percent (66-2/3%) of
the voting power of the then outstanding shares of Voting Stock, voting together
as a single class, shall be required for the adoption, amendment or repeal of
the following sections of the Company's Bylaws by the stockholders of this
corporation: 2.2 (Annual Meeting) and 2.3 (Special Meeting).

       6. No action shall be taken by the stockholders of the Company except at
an annual or special meeting of the stockholders called in accordance with the
Bylaws.

       7. Any director, or the entire Board of Directors, may be removed from
office at any time (i) with cause by the affirmative vote of the holders of at
least a majority of the voting power of




all of the then-outstanding shares of the Voting Stock, voting together as a
single class; or (ii) without cause by the affirmative vote of the holders of at
least sixty-six and two-thirds percent (66-2/3%) of the voting power of all of
the then-outstanding shares of the Voting Stock.

                                  ARTICLE VIII

       Notwithstanding any other provisions of this Certificate of Incorporation
or any provision of law which might otherwise permit a lesser vote or no vote,
but in addition to any affirmative vote of the holders of any particular class
or series of the Voting Stock required by law, this Certificate of Incorporation
or any Preferred Stock Designation, the affirmative vote of the holders of at
least sixty-six and two-thirds percent (66-2/3%) of the voting power of all of
the then-outstanding shares of the Voting Stock, voting together as a single
class, shall be required to alter, amend or repeal ARTICLE VII or this ARTICLE
VIII.

                                   ARTICLE IX

       The Company reserves the right to amend, alter, change or repeal any
provision contained in this Certificate of Incorporation, in the manner now or
hereafter prescribed by statute, except as provided in ARTICLE VIII of this
Certificate, and all rights conferred upon the stockholders herein are granted
subject to this right.

                                    ARTICLE X

       In furtherance and not in limitation of the powers conferred by statute,
the Board of Directors is expressly authorized to make, alter, amend or repeal
the Bylaws of the Company.

                                   ARTICLE XI

       1. To the fullest extent permitted by the Delaware General Corporation
Law as the same exists or as may hereafter be amended, a director of the Company
shall be indemnified by the Company or its stockholders for monetary damages for
breach of fiduciary duty as a director.

       2. The Company shall indemnify to the fullest extent permitted by law any
person made or threatened to be made a party to an action or proceeding, whether
criminal, civil, administrative or investigative, by reason of the fact that he,
his testator or intestate is or was a director, officer or employee of the
Company or any predecessor of the Company or serves or served at any other
enterprise as a director, officer or employee at the request of the Company or
any predecessor to the Company.

       3. Neither any amendment nor repeal of this Article XI, nor the adoption
of any provision of this Company's Certificate of Incorporation inconsistent
with this Article XI, shall eliminate or reduce the effect of this Article XI,
in respect of any matter occurring, or any action or proceeding accruing or
arising or that, but for this Article XI, would accrue or arise, prior to such
amendment, repeal or adoption of an inconsistent provision.




                                   ARTICLE XII

       Meetings of stockholders may be held within or without the State of
Delaware, as the Bylaws may provide. The books of the Company may be kept
(subject to any provision contained in the statutes) outside of the State of
Delaware at such place or places as may be designated from time to time by the
Board of Directors or in the Bylaws of the Company.

                                  ARTICLE XIII

       Advance notice of new business and stockholder nominations for the
election of directors shall be given in the manner and to the extent provided in
the Bylaws of the Company.

       IN WITNESS WHEREOF, the Company has caused this Certificate of
Incorporation to be signed by Greg R. Reyes, its Chief Financial Officer,
effective as of April 20, 2001.

                                        BROCADE COMMUNICATIONS SYSTEMS, INC.


                                        By:
                                             -------------------------------
                                             Michael J. Byrd
                                             Chief Financial Officer