Exhibit 32.1

CERTIFICATION OF PRINCIPAL EXECUTIVE OFFICER

AND PRINCIPAL FINANCIAL OFFICER PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

I, Lloyd A. Carney, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that the Quarterly Report on Form 10-Q of Brocade Communications Systems, Inc. for the fiscal quarter ended July 29, 2017 fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934 and that information contained in such Quarterly Report on Form 10-Q fairly presents, in all material respects, the financial condition and results of operations of Brocade Communications Systems, Inc.

Date: September 1, 2017

By:	/s/ Lloyd A. Carney
	Lloyd A. Carney
	Chief Executive Officer
	(Principal Executive Officer)

I, Daniel W. Fairfax, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that the Quarterly Report on Form 10-Q of Brocade Communications Systems, Inc. for the fiscal quarter ended July 29, 2017 fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934 and that information contained in such Quarterly Report on Form 10-Q fairly presents, in all material respects, the financial condition and results of operations of Brocade Communications Systems, Inc.

Date: September 1, 2017

By:	/s/ Daniel W. Fairfax
	Daniel W. Fairfax
	Senior Vice President and Chief Financial Officer
	(Principal Financial and Accounting Officer)