Document:

<PAGE>
                                                                   Exhibit 10.71

                                                                      (IBM LOGO)
                                                            3039 Cornwallis Road
                                                                   RTP, NC 27709

March 26, 2004

Brocade Communications Systems, Inc.
1745 Technology Drive
San Jose, CA  95110

Attention:  Mr. Michael Harrison

Subject:  Amendment 15 to SOW#1 of the IBM/Brocade Goods Agreement ROC-P-68

Dear Michael:

This letter (the "Amendment") serves as Amendment Number 15 to SOW#1, including
all amendments thereto ("SOW#1") of the Goods Agreement ROC-P-68, which the
parties hereto do mutually agree to amend as follows:

1.    The following Brocade Products are hereby incorporated into the Agreement
      via the new Pricing Schedule Attached: 1) [*], eight port switch, one
      fixed power supply, two domain fabric, with WebTools and Advanced Zoning;
      and 2) [*], sixteen port switch, two fixed power supplies, four domain
      fabric, with WebTools, Advanced Zoning and Fabric Watch. and 3) [*], Fibre
      Channel Director, includes 2 Meteor Port Blades, 2 Meteor CP Blades, 2
      Power Supplies, 3 Blowers, 6 Port Blade Filler Panels, 1 Cable Management
      Pillar, 2 Power Supply Filler Panels, Fabric OS, Advanced Web Tools,
      Advanced Zoning, Fabric Watch, Performance Monitoring, Trunking.

2.    The Definitions section is amended to include the following:

      a. "Backline Support" refers to the escalation point for Frontline
      Support, for issues that cannot reasonably be resolved by Frontline
      Support, such as complicated installation or configuration issues,
      compatibility issues, complicated problem isolation and troubleshooting,
      and escalation of verified bugs to engineering. Backline Support is
      provided through telephone and e-mail support during normal Brocade
      business hours and after-hours support for Severity 1 problems. For more
      details, please refer to Brocade's Service Plan Policies Document
      <http://www.brocade.com/support/service_policies.jsp>.

      b. "End of Life" or "EOL" means the date and process by which Supplier
      discontinues the manufacture of a product.

      c. "End of Service" or "EOS" means date when Buyer officially discontinues
      Customer service and support for a Product. EOS dates are only addressed
      for the purposes of defining the date through which Supplier will make
      Repair Services available for Products, and do not affect Supplier's
      obligations with respect to FRU or other Product availability.

      d. "Feature" - Feature Release Version is always a number. It is used to
      indicate added minor and/or major functionality within a Platform Release
      Version.

      e. "Frontline Support" includes the initial direct contact with the
      end-user, call logging, entitlement verification, problem definition and
      isolation, determination of whether a solution is contained in the end
      user documentation, review of symptoms in the Brocade Knowledge Base for

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                                       1

Amendment #15 to SOW#1 of IBM/Brocade Agreement ROC-P-68
CONFIDENTIAL INFORMATION
<PAGE>
      known resolutions, problem escalation to Brocade, and closing the case
      with the end user after problem resolution.

      f. "Field Replaceable Unit" or "FRU" means a Product, Product component,
      Product subassembly, Product documentation, Product code, or other Product
      part used to service a Customer system as described in the Product written
      specification.

      g. "Maintenance" - Maintenance Release Version is always a number. It is
      used to indicate a scheduled (date driven) release of defect fixes and
      carefully selected RFEs (Requests for Enhancements.)

      h. "Patch" - Patch Release Version is a letter (a-z). A Patch release
      Version should be considered functionally identical to Maintenance Release
      Version with the exception of the identified defect fixes. It will consist
      of one, or a limited number of defect fixes. A patch release is based upon
      the severity/priority of the defect and must be a critical or high
      severity defect from a customer point of view as well as from Brocade
      point of view.

      -     Patch fixes are rolled into the next maintenance, feature or
            platform release.

      -     Patch fixes are cumulative for that code branch.

      i. "Platform" - Platform Release Version is always a number. It is used to
      designate a significant functional change to the software, and generally
      follows core fabric OS architecture changes, hardware architecture changes
      or new ASIC support.

      j. "Product_version_code (string designator)" - the letter V is
      exclusively used by the Fabric OS software product. For all other
      products, the product code name will be used. To avoid potential issues,
      all products will be named with lowercase.

      k. "Software Maintenance" refers to the provision to Buyer by Supplier of
      certain software updates at no additional charge (beyond any charges for
      Support and Maintenance) during the Software Maintenance period.
      Maintenance and Patch releases are generally included with Software
      Maintenance. Platform and Feature releases generally are not included with
      Software Maintenance.

      l. "Support and Maintenance" or "Software Maintenance and Support" mean
      Backline Support and Software Maintenance.

3.    Section 2.3 "Taxes and Duties" is replaced in its entirety with the
      following:

      Supplier will ensure that the Prices do not include any sales, use or
      other similar taxes that do not apply to Buyer [*]. As may be necessary
      from time to time, the parties agree to negotiate in good faith to
      establish the terms and conditions for all legal, regulatory and
      administrative requirements, in addition to all associated duties and
      fees, associated with importation of Products into the country where the
      Product [*], which terms will be incorporated into this Agreement when
      signed by both parties. Supplier's invoices shall state applicable taxes
      owed by the Buyer, if any, [*] and with a proper [*] Products and
      Services. [*] shall remit such tax payments to [*]. Supplier agrees to use
      its commercially reasonable efforts to properly calculate any applicable
      Taxes at the time of invoice. Supplier and Buyer agree to cooperate to
      minimize any applicable Taxes, including reasonable notice and cooperation
      in connection with any audit. Any incremental taxes shall be [*]
      responsibility. If Buyer provides certification of an exemption from Tax
      or reduced rate of Tax imposed by an applicable taxing authority, then [*]
      unless and until the applicable taxing authority [*], at which time [*].

      Buyer shall withhold taxes, if required under the law to be withheld on
      payments made to Supplier hereunder and shall be required to remit to
      Supplier [*]. Buyer shall remit the taxes withheld to the appropriate
      government authority and agrees to provide Supplier in a timely manner
      with properly executed documentation or other information or receipts or
      certificates evidencing Buyers payment of any such withholding tax.

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                                       2

Amendment #15 to SOW#1 of IBM/Brocade Agreement ROC-P-68
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<PAGE>
4.    The following is appended to Section 9.4:

      All Products purchased under this SOW are subject to [*] Software
      Maintenance and Support Program. Under the terms of this support program
      Supplier shall provide Software Maintenance and Support for a period of
      [*] commencing on the Effective Date of the Agreement. Thereafter, the [*]
      Software Maintenance and Support Program [*] for additional [*] periods
      commencing on the anniversary of the Effective Date of the Agreement,
      unless [*] with ninety- (90) days prior [*]. The fees for this [*]
      Software Maintenance Support Program shall be calculated as the [*] (as
      shown in Attachment Section 2.1 "Pricing"), multiplied by the [*]) during
      the [*] Software Maintenance Support period. For the convenience of [*],
      Software Maintenance shall be billed to Buyer with [*] as described in
      Attachment Section 2.1 "Pricing" and will be used to determine the total
      billings. The amounts for the [*]and [*] billed to Buyer with [*] shall be
      [*]. If total billings for Software Maintenance during [*] period exceed
      the fee for the [*] as determined per the calculation as described in this
      section, the excess billings will be used to [*], may be [*] Software
      Maintenance Support Program, or may be used as an [*] as mutually agreed
      upon. If total billings for Software Maintenance during [*] period are
      less than the fee for the [*] Software Maintenance Support Program as
      determined per the calculation as described in this section, [*] may elect
      to either [*] invoice such amount, adjust the [*] price in subsequent
      period(s) for the deficient amount, or adjust [*] based on [*] between the
      parties. When initiating a technical support request with Supplier, Buyer
      [*] either the serial number or worldwide name of the Product. Supplier
      shall have the right to assign support obligations to the appropriate
      local Supplier subsidiary.

      The parties agree to negotiate in good faith to clarify [*], and to amend
      this SOW accordingly by April 16, 2004.

Please have your authorized representative indicate acceptance thereof by
signing both copies of the Amendment and returning one copy to the attention of
Robert Tice at 3039 Cornwallis Road Research Triangle Park, NC 27709.

The effective date of this Amendment shall be the date on the top of this
Amendment (the "Effective Date").

The parties acknowledge that they have read this Amendment, understand it, and
agree to be bound by its terms and conditions. All capitalized terms not defined
herein shall have the meaning set forth in the Goods Agreement or the SOW #1.
All other terms and conditions of the Goods Agreement and SOW#1 that are
unaffected by the revisions set forth in this Amendment shall remain in full
force and effect. Further, the parties agree that this Amendment and the Goods
Agreement and SOW#1 are the complete and exclusive statement of the agreement
between the parties, superseding all proposals or other prior agreement, oral or
written, and all other communications between the parties relating to this
subject.

<TABLE>
<S>                                            <C>
ACCEPTED AND AGREED TO:                              ACCEPTED AND AGREED TO:
INTERNATIONAL BUSINESS MACHINES CORPORATION          BROCADE COMMUNICATIONS SYSTEMS, INC.

By:  /s/ Robert J. Tice        3/29/04         By:    /s/ Jack Cuthbert        3/26/04
     ---------------------------------               ----------------------------------
     Authorized Signature       Date                 Authorized Signature       Date

       Robert J. Tice                                      Jack Cuthbert
--------------------------------------               ----------------------------------
Type or Print Name                                   Type or Print Name

     OEM Procurement Team Lead                            VP, OEM Sales
--------------------------------------               -----------------------------------
Title & Organization                                 Title & Organization

</TABLE>
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Amendment #15 to SOW#1 of IBM/Brocade Agreement ROC-P-68
CONFIDENTIAL INFORMATION
<PAGE>
                                   ATTACHMENTS

1.    Delete the table in its entirety in Section 1.1, "Specifications" and
      replace with the following:

<TABLE>
<CAPTION>
IBM SPECIFICATION/ATTACHMENTS
(IF APPLICABLE)                       ENGINEERING CHANGE LEVEL               DESCRIPTION
-----------------------------         ------------------------               -----------
<S>                                   <C>                                    <C>
NA                                    Version 1.0                            SilkWorm 2000 Family Product Specification
                                                                             90-0000001-01
Attachment B                          Dated 8/06/2001                        Supplier Quality Attachment
GA-219261-11                          Version 10                             Packaging and Materials Handling Specification
Attachment A                          Dated 10/27/03, part number 22R0129    IBM SAN CSP Specification
NA                                    Version 2.0                            Brocade Fabric OS Publication 53-0001487-03
NA                                    Version 2.1                            Brocade WebTools Reference Manual Publication
                                                                             53-0001490-02
NA                                    Version 2.0                            Brocade Zoning Reference Manual Publication
                                                                             53-0001488-02
NA                                    Version 1.0                            SilkWorm 3800 Product
                                                                             Specification - 90-0000077-01
NA                                    Version 1.1                            SilkWorm 3900 Product Specification - 79-0000002-01
NA                                                                           SilkWorm 3200 Product Specification - Reference the
                                                                             Silkworm 3800 Product
NA                                    Dated:  March 8, 2002                  SilkWorm 12000 Product
                                                                             Specification  - 79-0000001-01
NA                                    Version 4.1.2                          Brocade Fabric OS
                                                                             Reference 53-0000519-06
NA                                    Version 3.1.0                          Brocade Fabric OS
                                                                             Reference 53-0000500-02
NA                                    Version 1.0                            SilkWorm 24000 Product Specification dated Nov 7, 2003
NA                                    Dated:  December, 2003                 SilkWorm 3250 Product Specification - 79-0000006-01
NA                                    Dated:  December, 2003                 SilkWorm 3850 Product Specification - 79-0000005-01
</TABLE>

                                       4

Amendment #15 to SOW#1 of IBM/Brocade Agreement ROC-P-68
CONFIDENTIAL INFORMATION
<PAGE>
2.    Delete pricing table in its entirety in Section 2.1, "Pricing" and replace
      with the following:

<TABLE>
<CAPTION>
IBM P/N / NUMA-Q
    P/N           BROCADE P/N       DESCRIPTION                                        UNIT PRICE
----------------  -----------       -----------                                        ----------
<S>               <C>               <C>                                                <C>
[*]                    [*]          8-Port Fibre Channel Switch Single Power Supply       [*]
                                    (SW2400) Includes [*] - whole unit switch Product
[*]                    [*]          16 Port Fibre Channel                                 [*]
                                    Switch Single Power Supply (SW2800)
                                    Includes [*] - whole unit switch Product
[*]                    [*]          Silkworm 2000 Power Supply                            [*]
[*]                    [*]          Mainboard, SW 2400 (8-port)                           [*]
[*]
[*]                    [*]          Fan Tray, SW 2400 (8-port)                            [*]
[*]                    [*]          Chassis, SW 2400   (8-port)                           [*]
[*]                    [*]          Mainboard, SW 2800                                    [*]
[*]                                 (16-port)
[*]                    [*]          Fan Tray, SW 2800 (16-port)                           [*]
[*]                    [*]          Chassis, SW 2800 (16-port) with operator panel        [*]
                                    / LCD
[*]                    [*]          Quick Loop License                                    [*]
[*]                    [*]          Fabric Watch License                                  [*]
[*]                    [*]          Extended Fabrics                                      [*]
[*]                    [*]          Extended Fabrics                                      [*]
[*]                    [*]          Remote Switch                                         [*]
[*]                    [*]          Remote Switch                                         [*]
[*]                    [*]          8 Port Fibre Channel Switch Single Power Supply       [*]
                                    (SW3200) Includes [*]  (to be included prior to
                                    10/28/03 for availability for Buyer customer
                                    shipments)
[*]                    [*]          8 Port Fibre Channel Switch Single Power Supply       [*]
                                    (SW3200) Includes [*]                                 [*]
[*]                    [*]          Full Fabric Upgrade Includes  [*]                     [*]
[*]                    [*]          16 Port Fibre Channel                                 [*]
                                    Switch Single Power
                                    Supply (SW3800)
                                    Includes [*] - whole unit switch Product
[*]                    [*]          Fan (SW3800)                                          [*]
</TABLE>
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                                       5

Amendment #15 to SOW#1 of IBM/Brocade Agreement ROC-P-68
CONFIDENTIAL INFORMATION
<PAGE>
<TABLE>
<CAPTION>
IBM P/N / NUMA-Q
    P/N           BROCADE P/N       DESCRIPTION                                        UNIT PRICE
----------------  -----------       -----------                                        ----------
<S>               <C>               <C>                                                <C>
[*]                    [*]          Power Supply (SW3800)                                 [*]
[*]                    [*]          Mainboard FRU (SW3800)                                [*]
[*]                    [*]          32 Port Fibre Channel                                 [*]
                                    Switch Double Power Supply (SW3900)
                                    Includes, [*] - whole unit switch Product
[*]                    [*]          Fan (SW3900)                                          [*]
[*]                    [*]          Power Supply (SW3900)                                 [*]
[*]                    [*]          Mainboard FRU (SW3900)                                [*]
[*]                    [*]          Secure Fabric OS (SW3200)                             [*]
[*]                    [*]          Secure Fabric OS (SW3800)                             [*]
[*]                    [*]          1Gb Secure Fabric OS                                  [*]
[*]                    [*]          Secure Fabric OS (SW3900)                             [*]
[*]                    [*]          Secure Fabric OS (SW12000)                            [*]
[*]                    [*]          Performance Bundle  ([*])                             [*]
[*]                    [*]          Performance Bundle  ([*])                             [*]
[*]                    [*]          32 Port Fibre Channel Core Switch (SW12000)           [*]
                                    Includes 2 Stiletto Port Blades, 2 CP Blades, 4
                                    Power Supplies, 3 Blowers, 6 Port Blade Filler
                                    Panels, 1 Cable Management Pillar, [*].
[*]                    [*]          Rack Mounting Kit 14U, FRU                            [*]
[*]                    [*]          Switch Blade 16 port, 2GB                             [*]
[*]                    [*]          Switch Blade 16 port,                                 [*]
                                    2Gb, FRU
[*]                    [*]          Chassis Door, Includes Plastic and Metal door         [*]
                                    Components and IBM Front Badge
[*]                    [*]          Control Processor Blade                               [*]
[*]                    [*]          Stiletto Port Blade Slot Filler Panel, SW12000,       [*]
                                    FRU
[*]                    [*]          Power Supply , 180-264VAC, 1000W, FRU                 [*]
</TABLE>
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                                       6

Amendment #15 to SOW#1 of IBM/Brocade Agreement ROC-P-68
CONFIDENTIAL INFORMATION
<PAGE>
<TABLE>
<CAPTION>
IBM P/N / NUMA-Q
    P/N           BROCADE P/N       DESCRIPTION                                        UNIT PRICE
----------------  -----------       -----------                                        ----------
<S>               <C>               <C>                                                <C>
[*]                    [*]          Blower Assembly, FRU                                  [*]
[*]                    [*]          Cable Management Pillar, FRU                          [*]
[*]                    [*]          WWN Card                                              [*]
[*]                    [*]          Power Plug, Switch and Distribution Panel             [*]
[*]                    [*]          Chassis FRU, includes backplane, blower and           [*]
                                    power supply backplane, AC and blower harness.
[*]                    [*]          Rear WWN Bezel Assy                                   [*]
[*]                    [*]          Cable Management Tray                                 [*]
[*]                    [*]          AC Power Cord, FRU                                    [*]
[*]                    [*]          AC Power Cord, UK/Ireland, 250V, FRU                  [*]
[*]                    [*]          AC Power Cord, Cont. Europe CEE7/7, FRU               [*]
[*]                    [*]          AC Power Cord, AUST/INZ, 250V                         [*]
[*]                    [*]          AC Power Cord, Intl IEC                               [*]
[*]                    [*]          Remote Switch software                                [*]
[*]                    [*]          Extended Fabric software                              [*]
[*]                    [*]          Fabric Manager 3.x                                    [*]
[*]                    [*]          ISL Trunking (SW3200)                                 [*]
[*]                    [*]          ISL Trunking (SW3800)                                 [*]
</TABLE>

ADDITIONS AND CHANGES
<TABLE>
<CAPTION>
                                                                                                         **13 MONTHS
                                                                                                          SOFTWARE
                                                                                         UNIT            MAINTENANCE
                                                                                       PRICE OF     (INCLUDED IN UNIT PRICE OF
BUYER PART NUMBER  SUPPLIER PART NUMBER     PRODUCT DESCRIPTION                         PRODUCT            PRODUCT)
-----------------  --------------------     -------------------                         -------            --------
<S>                <C>                      <C>                                        <C>          <C>
[*]                     [*]                 Fabric Manager 4.x-Enterprise
                                            (Unlimited copies per one server/PC)          [*]                 [*]
[*]                     [*]                 Fabric Manager 4.x  - 3.0 to 4.x
                                            Upgrade to Enterprise ([*])                   [*]                 [*]
[*]                     [*]                 Fabric Manager 4.x with 10 Domains            [*]                 [*]
[*]                     [*]                 Fabric Manager 4.x [*]                        [*]                 [*]
[*]                     [*]                 Secure Fabric OS (SW12000/24000)              [*]                 [*]
[*]                     [*]                 32 Port Fibre Channel Director
</TABLE>
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                                       7

Amendment #15 to SOW#1 of IBM/Brocade Agreement ROC-P-68
CONFIDENTIAL INFORMATION
<PAGE>
<TABLE>
<CAPTION>
                                                                                                         **13 MONTHS
                                                                                                          SOFTWARE
                                                                                         UNIT            MAINTENANCE
                                                                                       PRICE OF     (INCLUDED IN UNIT PRICE OF
BUYER PART NUMBER  SUPPLIER PART NUMBER     PRODUCT DESCRIPTION                         PRODUCT            PRODUCT)
-----------------  --------------------     -------------------                         -------            --------
<S>                <C>                      <C>                                        <C>          <C>
                                            (SW24000) Includes 2 Meteor Port
                                            Blades, 2 Meteor CP Blades,                   [*]                 [*]
                                            2 Power Supplies, 3 Blowers,
                                            6 Port Blade Filler Panels, 1 Cable
                                            Management Pillar, 2 Power Supply
                                            Filler Panels, Fabric OS, [*]

[*]                     [*]                 Meteor, 16 Port Upgrade Blade                 [*]                 [*]
[*]                     [*]                 Meteor Upgrade kit.  Includes:                [*]                 [*]
                                            2 Meteor 16 port blades and 2
                                            Meteor CP blades

[*]                     [*]                 8 Port Fibre Channel Two Domain               [*]                 [*]
                                            Switch Single Power Supply (SW3250),
                                            [*]
                                            COO - China

[*]                     [*]                 8 Port Fibre Channel Two Domain               [*]                 [*]
                                            Switch Single Power Supply (SW3250),
                                            [*]
                                            COO - United States

[*]                     [*]                 16 Port Fibre Channel Four Domain             [*]                 [*]
                                            Switch, Two Fixed Power Supplies
                                            (SW3850),

                                            v
                                            COO - China

[*]                     [*]                 16 Port Fibre Channel Four Domain             [*]                 [*]
                                            Switch, Two Fixed Power Supplies
                                            (SW3850),
                                            [*]

                                            COO - United States

[*]                     [*]                 Secure Fabric OS (SW3850)                     [*]                 [*]
[*]                     [*]                 Secure Fabric OS (SW3250)                     [*]                 [*]
[*]                     [*]                 Meteor FRU Chassis , includes                 [*]                 [*]
                                            backplane, blower and power supply
                                            backplane, AC and blower harness.,
[*]                     [*]                 Meteor FRU, Chassis Door.  Includes           [*]                 [*]
                                            Plastic and Metal door Components
                                            and IBM Front Badge
[*]                     [*]                 Meteor Switch Blade 16 port, 2Gb, FRU         [*]                 [*]
[*]                     [*]                 Meteor Control Processor Blade, FRU           [*]                 [*]
[*]                     [*]                 FRU, Power Supply Filler Panels               [*]                 [*]
[*]                     [*]                 Extended Fabric                               [*]                 [*]
[*]                     [*]                 Remote Switch                                 [*]                 [*]
[*]                     [*]                 Performance Bundle  (Trunking and             [*]                 [*]
                                            Performance Monitoring)
[*]                     [*]                 Four Domain to Full Fabric Upgrade            [*]                 [*]
[*]                     [*]                 Extended Fabric                               [*]                 [*]
[*]                     [*]                 Remote Switch                                 [*]                 [*]
[*]                     [*]                 Performance Bundle (Trunking and              [*]                 [*]
                                            Performance Monitoring
</TABLE>
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the Securities and Exchange Commission. Confidential treatment has been
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                                       8

Amendment #15 to SOW#1 of IBM/Brocade Agreement ROC-P-68
CONFIDENTIAL INFORMATION

<PAGE>
<TABLE>
<CAPTION>
                                                                                                         **13 MONTHS
                                                                                                          SOFTWARE
                                                                                         UNIT            MAINTENANCE
                                                                                       PRICE OF     (INCLUDED IN UNIT PRICE OF
BUYER PART NUMBER  SUPPLIER PART NUMBER     PRODUCT DESCRIPTION                         PRODUCT            PRODUCT)
-----------------  --------------------     -------------------                         -------            --------
<S>                <C>                      <C>                                        <C>          <C>
[*]                     [*]                 Two Domain to Full Fabric Upgrade             [*]                 [*]
                                            includes Fabric Watch
[*]                     [*]                 8 port Switch FRU                             [*]                 [*]
                                            COO - United States
[*]                     [*]                 16 port Switch FRU                            [*]                 [*]
                                            COO - United States
</TABLE>

**For purpose of calculating the fees for the [*] Software Maintenance Support
Program as described in Section 9.4, [*] for each part number where it is
applicable as follows:

<TABLE>
<CAPTION>
                 BROCADE                                                                                         ANNUAL SOFTWARE
IBM PART         PRODUCT                                                                                           MAINTENANCE
NUMBER         PART NUMBER       PRODUCT DESCRIPTION                                                               FEE PER UNIT
------         -----------       -------------------                                                               ------------

<S>            <C>               <C>                                                                              <C>
[*]                [*]           32 Port Fibre Channel Director (SW24000) Includes 2 Meteor Port Blades,               [*]
                                 2 Meteor CP Blades, 2 Power Supplies, 3 Blowers, 6 Port Blade Filler Panels,
                                 1 Cable Management Pillar, 2 Power Supply Filler Panels, Fabric OS, [*]
[*]                [*]           Meteor Upgrade kit.  Includes:  2 Meteor 16 port blades and 2 Meteor CP blades        [*]
[*]                [*]           8 Port Fibre Channel Two Domain Switch Single Power Supply (SW3250),                  [*]
                                 Includes [*]
                                 COO - China

[*]                [*]           8 Port Fibre Channel Two Domain Switch Single Power Supply (SW3250),                  [*]
                                 Includes [*]
                                 COO - United States
[*]                [*]           16 Port Fibre Channel Four Domain Switch, Two Fixed Power Supplies (SW3850),          [*]
                                 Includes [*]
                                 COO - China
[*]                [*]           16 Port Fibre Channel Four Domain Switch, Two Fixed Power Supplies (SW3850),          [*]
                                 Includes [*]
                                 COO - United States
[*]                [*]           Fabric Manager 4.x-Enterprise ([*])                                                   [*]
[*]                [*]           Fabric Manager 4.x  - 3.0 to 4.x Upgrade to Enterprise ([*])                          [*]
[*]                [*]           Fabric Manager 4.x with 10 Domains                                                    [*]
[*]                [*]           Fabric Manager 4.x [*]                                                                [*]
[*]                [*]           Secure Fabric OS (SW3850)                                                             [*]
[*]                [*]           Secure Fabric OS (SW3250)                                                             [*]
[*]                [*]           Secure Fabric OS (SW12000/24000)                                                      [*]
</TABLE>

OUT OF WARRANTY REPAIR PRICING:

[*]          [*]
[*]          [*]

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requested with respect to the omitted portions.

Amendment #15 to SOW#1 of IBM/Brocade Agreement ROC-P-68
CONFIDENTIAL INFORMATION

                                       9<PAGE>
                                                                   Exhibit 10.72

                                 AMENDMENT NO. 6
                               PURCHASE AGREEMENT

This Amendment No. 6 ("the Amendment") to the Purchase Agreement (the
"Agreement") dated January 25, 2000 by and among Brocade Communications Systems,
Inc., a corporation organized under the laws of the State of Delaware, U.S.A.,
and having its principal place of business at 1745 Technology Drive, San Jose,
California 95110 ("Brocade-US"), and Brocade Communications Switzerland SarL., a
corporation organized under the laws of Geneva, and having its principal place
of business at 29-31 Route de l'Aeroport, Case Postale 105 CH-1215 Geneva 15,
Switzerland ("Brocade-Switzerland"), (collectively "SUPPLIER") and EMC
Corporation, ("EMC"), a Massachusetts corporation, is made this 8th day of April
2004 by and between SUPPLIER and EMC and commences on the date accepted and
executed by SUPPLIER ("Effective Date"). [*].

WHEREAS, the parties wish to amend the Agreement to [*] EMC [*]. NOW THEREFORE,
IN CONSIDERATION OF THE ABOVE AND THE OTHER RESPECTIVE PROMISES OF THE PARTIES
SET FORTH HEREIN, THE PARTIES HERETO AGREE AS FOLLOWS:

1) Exhibit A, [*], is hereby deleted and replaced with the attached Exhibit A,
[*].

2) No Other Changes. All Other terms and conditions of the Agreement shall
remain unchanged.

3) Counterparts. This Amendment may be executed in two or more counterparts, all
of which, taken together, shall be regarded as one and the same instrument.

IN WITNESS WHEREOF, the parties hereto have executed this Amendment No. 6 to OEM
Purchase and License Agreement by their duly authorized representatives. Such
execution of the Amendment may be in three counterparts, each of which shall be
an original and together which shall constitute one and the same instrument.

<TABLE>
<S>                                    <C>
Executed and agreed to:                Executed and agreed to:
Brocade Communications Systems, Inc.   EMC Corporation
("Supplier")

Signature: /s/ Jack Cuthbert           Signature: /s/ Bill Monagle
           --------------------                   ------------------------------

Name:  Jack Cuthbert                        Name: William Mongle
           --------------------                   ------------------------------

Title:  VP OEM Sales                        Title: Vice President Corporate Procurement
                                                       EMC Corporation

Date:    4/27/04                            Date:
      --------------------                       ------------------------------
</TABLE>
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** Certain information on this page has been omitted and filed separately with
the Securities and Exchange Commission. Confidential treatment has been
requested with respect to the omitted portions.

                            EMC/BROCADE CONFIDENTIAL

Page 1 of 3
<PAGE>
Brocade Communications Switzerland, SarL.
("Supplier")

Signature: /s/ Ian Whiting
           -------------------------

Name: Ian Whiting
      ------------------------------

Title: Managing Officer
      ------------------------------

Place: Geneva, Switzerland
      ------------------------------

Date:  27-April -2004
      ------------------------------

                            EMC/BROCADE CONFIDENTIAL

Page 2 of 3
<PAGE>
                                   EXHIBIT A
                              PRODUCTS AND PRICING

                            EMC/BROCADE CONFIDENTIAL

Page 3 of 3
<PAGE>
EMC EXHIBIT A:  PRODUCT PRICE SHEET - REVISED 4/15/04

REVISIONS: Addition of new Dazzler and Meteor products, Reduction on certain
software options, Removal of EOL'd SFP FRUs (PN#100619005, 118032135).

<TABLE>
<S>      <C>    <C>      <C>   <C>                                                                      <C>
[*]      [*]    A02      [*]   2GB, 8 PORT SW3200 ENTRY-FABRIC SWITCH                                   [*]
[*]      [*]    A01      [*]   2GB, 8 PORT SW3200 FULL-FABRIC SWITCH                                    [*]
[*]      [*]    A01      [*]   2GB, 8 PORT SW3250 ENTRY-FABRIC SWITCH   (GENERAL)                       [*]
[*]      [*]    A01      [*]   2GB, 8 PORT SW3250 ENTRY-FABRIC SWITCH   (US FED ONLY)                   [*]
[*]      [*]    A01      [*]   SW32X0 OPTIONAL SOFTWARE, TRUNKING                                       [*]
[*]      [*]    A01      [*]   SW32X0 OPTIONAL SOFTWARE, FABRIC WATCH                                   [*]
[*]      [*]    A01      [*]   SW32X0 OPTIONAL SOFTWARE, EXTENDED FABRIC                                [*]
[*]      [*]    A01      [*]   SW32X0 OPTIONAL SOFTWARE, PERFORMANCE MONITOR                            [*]
[*]      [*]    A01      [*]   SW3220 OPTIONAL SOFTWARE, QUICKLOOP                                      [*]
[*]      [*]    A01      [*]   SW32X0 OPTIONAL SOFTWARE, EMC BUNDLE (TRK, FWH, EXF, PRF)                [*]
[*]      [*]    A01      [*]   SW3220 OPTIONAL SOFTWARE UPGRADE ENTRY-FULL: BUNDLED                     [*]
[*]      [*]    A01      [*]   SW3220 OPTIONAL SOFTWARE UPGRADE ENTRY-FULL: POST SALE                   [*]
[*]      [*]    A01      [*]   SW32X0 OPTIONAL SOFTWARE, SECURE OS                                      [*]
[*]      [*]    A01      [*]   SW3252 TWO DOMAIN TO FULL FABRIC UPGRADE LICENSE KEY - POST SALE         [*]
[*]      [*]    A01      [*]   SW3252 TWO DOMAIN TO FULL FABRIC UPGRADE LICENSE KEY - BUNDLED           [*]
</TABLE>

Note (A): The annual fee for Software Maintenance is $80. The above price
includes the purchase of Software Maintenance for an initial term of one year,
commencing on the date of purchase, and an automatic renewal for a subsequent
one year term. Fees for Software Maintenance during these periods are
non-refundable. Thereafter, Software Maintenance may be renewed for additional
one year periods, at EMC's discretion, for an annual fee of $80. The above price
also includes the purchase of an Extended Hardware Warranty for a term of one
year commencing on the first anniversary of the date of purchase.
<TABLE>
<S>      <C>    <C>      <C>   <C>                                                                      <C>
[*]      [*]    A08      [*]   2GB, 16 PORT SW3800 FULL-FABRIC SWITCH                                   [*]
[*]      [*]    A01      [*]   2GB, 16 PORT SW3852 ENTRY-FABRIC SWITCH   (GENERAL)                      [*]
[*]      [*]    A01      [*]   2GB, 16 PORT SW3852 ENTRY-FABRIC SWITCH   (US FED ONLY)                  [*]
[*]      [*]    00       [*]   SW3800 FRU, POWER SUPPLY                                                 [*]
[*]      [*]    00       [*]   SW3800 FRU, FAN                                                          [*]
[*]      [*]    A01      [*]   SW38XX OPTIONAL SOFTWARE, TRUNKING                                       [*]
[*]      [*]    A01      [*]   SW38XX OPTIONAL SOFTWARE, FABRIC WATCH                                   [*]
[*]      [*]    A01      [*]   SW38XX OPTIONAL SOFTWARE, EXTENDED FABRIC                                [*]
[*]      [*]    A01      [*]   SW38XX OPTIONAL SOFTWARE, PERFORMANCE MONITOR                            [*]
[*]      [*]    A01      [*]   SW3800 OPTIONAL SOFTWARE, QUICKLOOP                                      [*]
[*]      [*]    NA       [*]   SW38XX OPTIONAL SOFTWARE, EMC BUNDLE (TRK, FWH, EXF, PRF)                [*]
[*]      [*]    A01      [*]   SW38XX OPTIONAL SOFTWARE, SECURE OS                                      [*]
[*]      [*]    A01      [*]   SW3852 TWO DOMAIN TO FULL FABRIC UPGRADE LICENSE KEY - BUNDLED           [*]
</TABLE>

Note (B): The annual fee for Software Maintenance is $190. The above price
includes the purchase of Software Maintenance for an initial term of one year,
commencing on the date of purchase, and an automatic renewal for a subsequent
one year term. Fees for Software Maintenance during these periods are
non-refundable. Thereafter, Software Maintenance may be renewed for additional
one year periods, at EMC's discretion, for an annual fee of $190. The above
price also includes the purchase of an Extended Hardware Warranty for a term of
one year commencing on the first anniversary of the date of purchase.

<TABLE>
<S>      <C>    <C>      <C>   <C>                                                                      <C>
[*]      [*]    A03      [*]   2GB, 32 PORT SWITCH (WEBTOOLS, ZONING)                                   [*]
[*]      [*]    A01      [*]   FRU, POWER SUPPLY                                                        [*]
[*]      [*]    A01      [*]   FRU, FAN                                                                 [*]
[*]      [*]    A00      [*]   FRU, SFP, SWL, 1PK (FINISAR ONLY)                                        [*]
[*]      [*]    A01      [*]   FRU, SFP, LWL, 1PK (FINISAR ONLY)                                        [*]
[*]      [*]    A01      [*]   OPTIONAL SOFTWARE, TRUNKING                                              [*]
[*]      [*]    A01      [*]   OPTIONAL SOFTWARE, FABRIC WATCH                                          [*]
[*]      [*]    A01      [*]   OPTIONAL SOFTWARE, EXTENDED FABRIC                                       [*]
</TABLE>
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** Certain information on this page has been omitted and filed separately with
the Securities and Exchange Commission. Confidential treatment has been
requested with respect to the omitted portions.
<PAGE>
<TABLE>
<S>      <C>    <C>      <C>   <C>                                                                      <C>
[*]      [*]    A01      [*]   OPTIONAL SOFTWARE, PERFORMANCE MONITOR                                   [*]
[*]      [*]    A01      [*]   OPTIONAL SOFTWARE, EMC BUNDLE (TRK, FWH, EXF, PRF)                       [*]
[*]      [*]    A01      [*]   OPTIONAL SOFTWARE, SECURE OS                                             [*]
</TABLE>

Note (C): The annual fee for Software Maintenance is $200. The above price
includes the purchase of Software Maintenance for an initial term of one year,
commencing on the date of purchase, and an automatic renewal for a subsequent
one year term. Fees for Software Maintenance during these periods are
non-refundable. Thereafter, Software Maintenance may be renewed for additional
one year periods, at EMC's discretion, for an annual fee of $200. The above
price also includes the purchase of an Extended Hardware Warranty for a term of
one year commencing on the first anniversary of the date of purchase.

<TABLE>
<S>      <C>    <C>      <C>   <C>                                                                      <C>
[*]      [*]    A04      [*]   2GB, 64 PORT ENTERPRISE (WEBTOOLS, ZONING)                               [*]
[*]      [*]    A01      [*]   2GB, 0 PORT, 2 CP, 2PS CONFIGURED CHASSIS                                [*]
[*]      [*]             [*]   UPGRADE KIT, SW12000 TO 24000 CONSISTS OF 2CPs                           [*]
[*]      [*]    A01      [*]   FRU, SW12000 CHASSIS                                                     [*]
[*]      [*]    A01      [*]   FRU, DIRECTOR UNIVERSAL CHASSIS                                          [*]
[*]      [*]    A00      [*]   FRU, SW12000 PORT CARD WITH OPTICS                                       [*]
[*]      [*]    A01      [*]   FRU, SW24000 PORT CARD WITH OPTICS                                       [*]
[*]      [*]    A00      [*]   FRU, SW12000 CP                                                          [*]
[*]      [*]    A00      [*]   FRU, SW24000 CP                                                          [*]
[*]      [*]    A00      [*]   FRU, POWER SUPPLY                                                        [*]
[*]      [*]    NA       [*]   FRU, POWER CORD, NO AMERICAN                                             [*]
[*]      [*]    NA       [*]   FRU, POWER CORD, UK/IRE                                                  [*]
[*]      [*]    NA       [*]   FRU, POWER CORD, CONT EU                                                 [*]
[*]      [*]    NA       [*]   FRU, POWER CORD, AUST/NZ                                                 [*]
[*]      [*]    NA       [*]   FRU, POWER CORD, OTHER 230V                                              [*]
[*]      [*]    NA       [*]   FRU, BROCADE RACKMOUNT KIT                                               [*]
[*]      [*]    A00      [*]   FRU, BLOWER                                                              [*]
[*]      [*]    NA       [*]   FRU, WWN BEZEL                                                           [*]
[*]      [*]    A00      [*]   FRU, WWN CARD                                                            [*]
[*]      [*]    NA       [*]   FRU, CHASSIS DOOR                                                        [*]
[*]      [*]    NA       [*]   FRU, PORT CARD SLOT FILLER                                               [*]
[*]      [*]    NA       [*]   FRU, POWER SUPPLY SLOT FILLER                                            [*]
[*]      [*]    NA       [*]   FRU, CABLE MANAGEMENT TRAY                                               [*]
[*]      [*]    NA       [*]   FRU, BLADE BOX PACKAGING ONLY                                            [*]
[*]      [*]    NA       [*]   FRU, BLOWER BOX PACKAGING ONLY                                           [*]
[*]      [*]    A02      [*]   FRU, EMC CUSTOM DOOR KIT SW12000                                         [*]
[*]      [*]             [*]   FRU, EMC CUSTOM DOOR KIT SW24000                                         [*]
[*]      [*]    NA       [*]   OPTIONAL SOFTWARE, TRUNKING                                              [*]
[*]      [*]    NA       [*]   OPTIONAL SOFTWARE, FABRIC WATCH                                          [*]
[*]      [*]    NA       [*]   OPTIONAL SOFTWARE, EXTENDED FABRIC                                       [*]
[*]      [*]    NA       [*]   OPTIONAL SOFTWARE, PERFORMANCE MONITOR                                   [*]
[*]      [*]    NA       [*]   OPTIONAL SOFTWARE, EMC BUNDLE (TRK, FWH, EXF, PRF)                       [*]
[*]      [*]    A01      [*]   OPTIONAL SOFTWARE, SECURE OS                                             [*]
</TABLE>

Note (D): The annual fee for Software Maintenance is $400. The above price
includes the purchase of Software Maintenance for an initial term of one year,
commencing on the date of purchase, and an automatic renewal for a subsequent
one year term. Fees for Software Maintenance during these periods are
non-refundable. Thereafter, Software Maintenance may be renewed for additional
one year periods, at EMC's discretion, for an annual fee of $400. The above
price also includes the purchase of an Extended Hardware Warranty for a term of
one year commencing on the first anniversary of the date of purchase.

Note (E): The annual fee for Software Maintenance is $580. The above price
includes the purchase of Software Maintenance for an initial term of one year,
commencing on the date of purchase, and an automatic renewal for a subsequent
one year term. Fees for Software Maintenance during these periods are
non-refundable. Thereafter, Software Maintenance may be renewed for additional
one year periods, at EMC's discretion, for an annual fee of $580. The above
price also includes the purchase of an Extended Hardware Warranty for a term of
one year commencing on the first anniversary of the date of purchase.

Note (F): The annual fee for Software Maintenance is $200. The above price
includes the purchase of Software Maintenance for an initial term of one year,
commencing on the date of purchase, and an automatic renewal for a subsequent
one year term. Fees for Software Maintenance during these periods are
non-refundable. Thereafter, Software Maintenance may be renewed for additional
one year periods, at EMC's discretion, for an annual fee of $200. The above
price also includes the purchase of an Extended Hardware Warranty for a term of
one year commencing on the first anniversary of the date of purchase.

FABRIC MANAGER
<TABLE>
<S>      <C>    <C>      <C>   <C>                                                                      <C>
[*]      [*]    NA       [*]   FM 4.0 BASE                                                              [*]
[*]      [*]    NA       [*]   FM 4.0 STANDARD                                                          [*]
[*]      [*]    NA       [*]   FM 4.0 ENTERPRISE                                                        [*]
[*]      [*]    NA       [*]   FM 3.0 UPGRADE                                                           [*]
[*]      [*]    NA       [*]   FM 4.0 BASE TO STANDARD UPGRADE                                          [*]
</TABLE>
------
** Certain information on this page has been omitted and filed separately with
the Securities and Exchange Commission. Confidential treatment has been
requested with respect to the omitted portions.
<PAGE>
<TABLE>
<S>      <C>    <C>      <C>   <C>                                                                      <C>
[*]      [*]    NA       [*]   FM 4.0 BASE TO ENTERPRISE UPGRADE                                        [*]
[*]      [*]    NA       [*]   FM 4.0 STANDARD TO ENTERPRISE UPGRADE                                    [*]
</TABLE>

Note: The above prices include the purchase of Software Maintenance for an
initial term of one year, commencing on the date of purchase, and an automatic
renewal for a subsequent one year term. Fees for Software Maintenance during
these periods are non-refundable. Thereafter, Software Maintenance may be
renewed for additional one year periods, at EMC's discretion, for an annual fee
as follows: EM-FMG4-0000-S $1,200; EM-FMG4-0004-S $450; EM-FMG4-0010-S $900;
EM-FMG4-7000-S $675; EM-FMG4-9000-S $300; EM-FMG4-9004-S $750; EM-FMG4-9010-S
$450.

------
** Certain information on this page has been omitted and filed separately with
the Securities and Exchange Commission. Confidential treatment has been
requested with respect to the omitted portions.

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