Prepared by R.R. Donnelley Financial -- Consent of Arthur Andersen LLP

As independent public accountants, we hereby consent to the incorporation by reference in this Amendment No. 1 to the registration statement on Form S-3 of our reports dated November 20, 2001 (except with respect to matters discussed in Note 12, as to which the date is January 10, 2002), included in Brocade Communications Systems, Inc.’s Form 10-K for the fiscal year ended October 27, 2001, and to all references to our Firm included in this Amendment No. 1 to the registration statement on Form S-3.