Statement of Changes in Beneficial Ownership (4)

LIMITED POWER OF ATTORNEY 
SECURITIES LAW COMPLIANCE

The undersigned, as an officer or director of Brocade Communications Systems, Inc. (the "Company"), hereby constitutes and appoints Daniel Fairfax, Jean Furter, Tom Gemetti, Matthew Ng, Eddie Shen, Katharine Martin and Lisa Stimmel, and each of them, the undersigned's true and lawful attorney-in-fact and agent to complete and execute such Forms 144, Forms 3, 4 and 5 and other forms as such attorney shall in his or her discretion determine to be required or advisable pursuant to Rule 144 promulgated under the Securities Act of 1933, as amended, Section 16 of the Securities Exchange Act of 1934, as amended, and the rules and regulations promulgated thereunder, or any successor laws and regulations, as a consequence of the undersigned's ownership, acquisition or disposition of securities of the Company, and to do all acts necessary in order to file such forms with the Securities and Exchange Commission, any securities exchange or national association, the Company and such other person or agency as the attorney shall deem appropriate.  The undersigned hereby ratifies and confirms all that said attorneys-in-fact and agents shall do or cause to be done by virtue hereof.

The undersigned hereby ratifies and confirms all that said attorneys-in-fact and agent shall do or cause to be done by virtue hereof.  The undersigned acknowledges that the foregoing attorneys-in-fact, in serving in such capacity at the request of the undersigned, is not assuming, nor is the Company assuming, any of the undersigned's responsibilities to comply with Rule 144 promulgated under the Securities Act of 1933, as amended, or Section 16 of the Securities Exchange Act of 1934, as amended.
      
This Limited Power of Attorney shall remain in full force and effect until the undersigned is no longer required to file Forms 3, 4 and 5 with respect to the undersigned's holdings of and transactions in securities issued by the Corporation unless earlier revoked by the undersigned in a writing delivered to the foregoing attorneys-in-fact.
      
This Limited Power of Attorney is executed at San Jose, as of the date set forth below. 
        

/s/ Ellen A. O'Donnell
Signature
Ellen A. O'Donnell        
Type or Print Name
Dated: June 12, 2014    

Witness:

/s/ Viviana Walker        
Signature
Viviana Walker
Type or Print Name
Dated:  June 12, 2014