UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 14A INFORMATION

PROXY STATEMENT PURSUANT TO SECTION 14(a) OF THE

SECURITIES EXCHANGE ACT OF 1934

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o  Preliminary Proxy Statement

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o  Definitive Proxy Statement

þ  Definitive Additional Materials

o  Soliciting Material Pursuant to Sec. 240.14a-12

Brocade Communications Systems, Inc.

(Name of Registrant as Specified In Its Charter)

(Name of Person(s) Filing Proxy Statement, if other than the Registrant)

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Effective upon stockholder approval of the Amended and Restated 1999 Director Plan at the Company’s 2008 Annual Meeting of Stockholders on April 10, 2008, new stock ownership guidelines would be in effect for non-employee members of the Company’s Board of Directors. Under the revised guidelines, non-employee directors must hold at least 10,000 shares of Brocade common stock. Directors have four years to achieve the required ownership level. Twenty-five percent of the restricted stock units awarded each year to non-employee directors must be retained, upon vesting, until the target guideline is achieved.