Document:

<PAGE>
                                                                    Exhibit 10.3

                                                              [IBM LOGO]
                                                           5600 Cottle Road
                                                      San Jose, CA   95193 0001
April 10, 2002

Brocade Communications Systems, Inc.
1901 Guadalupe Parkway
San Jose, CA  95131

Attention: Mr. Patrick Johnston

Subject:  Amendment 6 to SOW#1 of the IBM/Brocade Goods Agreement ROC-P-68

Dear Patrick:

This letter (the "Amendment") serves as Amendment Number 6 to SOW#1, including
all amendments thereto ("SOW#1") of the Goods Agreement ROC-P-68, including all
amendments thereto (the "Goods Agreement") which the parties hereto do mutually
agree to amend as follows:

1.      Add to the table in Section 1.1, "Specifications," the following:

<TABLE>
<CAPTION>
-----------------------------------------------------------------------------------------------------
IBM SPECIFICATION/ATTACHMENTS
(IF APPLICABLE)                          ENGINEERING CHANGE LEVEL              DESCRIPTION
-----------------------------------------------------------------------------------------------------
<S>                                      <C>                                   <C>
                                         TBD                                   SilkWorm 12000 Product
                                                                               Specification  TBD
-----------------------------------------------------------------------------------------------------
</TABLE>

2.      Add the following to the pricing table in Section 2.1, "Pricing":

<TABLE>
<CAPTION>
-------------------------------------------------------------------------------------------------------
        IBM P/N / NUMA-Q
              P/N                      BROCADE P/N                DESCRIPTION               UNIT PRICE
-------------------------------------------------------------------------------------------------------
<S>                               <C>                     <C>
[*]                               [*]                     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, Fabric
                                                          OS, Advanced Web Tools,
                                                          Advanced Zoning, Fabric
                                                          Watch, Performance
                                                          Monitoring, Trunking.
-------------------------------------------------------------------------------------------------------
</TABLE>

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

                                       1
<PAGE>
<TABLE>
<S>                               <C>                     <C>                               <C>
------------------------------------------------------------------------------------------------------
[*]                               [*]                     64 Port Fibre Channel Core        [*]
                                                          Switch (SW12000) Includes 4
                                                          Stiletto Port Blades, 2 CP
                                                          Blades, 4 Power Supplies, 3
                                                          Blowers, 4 Port Blade
                                                          Filler Panels, 1 Cable
                                                          Management Pillar, Fabric
                                                          OS, Advanced Web Tools,
                                                          Advanced Zoning, Fabric
                                                          Watch, Performance
                                                          Monitoring, Trunking.
------------------------------------------------------------------------------------------------------
[*]                               [*]                     128 Port Fibre Channel Core       [*]
                                                          Switch (SW12000) Includes 8
                                                          Stiletto Port Blades, 2 CP
                                                          Blades, 4 Power Supplies, 3
                                                          Blowers, 1 Cable Management
                                                          Pillar, Fabric OS, Advanced
                                                          Web Tools, Advanced Zoning,
                                                          Fabric Watch, Performance
                                                          Monitoring, Trunking.
------------------------------------------------------------------------------------------------------
[*]                               [*]                     Rack Mounting Kit 14U, FRU        [*]
------------------------------------------------------------------------------------------------------
[*]                               [*]                     Switch Blade 16 port, 2GB         [*]
------------------------------------------------------------------------------------------------------
[*]                               [*]                     Chassis Door, Includes            [*]
                                                          Plastic and Metal door
                                                          Components and IBM Front
                                                          Badge
------------------------------------------------------------------------------------------------------
[*]                               [*]                     Control Processor Blade           [*]
------------------------------------------------------------------------------------------------------
[*]                               [*]                     Stiletto Port Blade Slot          [*]
                                                          Filler Panel, SW12000, FRU
------------------------------------------------------------------------------------------------------
[*]                               [*]                     CP Blade Slot Filler Panel        [*]
------------------------------------------------------------------------------------------------------
[*]                               [*]                     Power Supply, 180-264VAC,         [*]
                                                          1000W, FRU
------------------------------------------------------------------------------------------------------
[*]                               [*]                     Blower Assembly, FRU              [*]
------------------------------------------------------------------------------------------------------
[*]                               [*]                     Cable Management Pillar, FRU      [*]
------------------------------------------------------------------------------------------------------
</TABLE>

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

                                       2
<PAGE>
<TABLE>
<S>                               <C>                     <C>                               <C>
------------------------------------------------------------------------------------------------------
[*]                               [*]                     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           [*]
------------------------------------------------------------------------------------------------------
[*]                               [*]                     Panel Card, Rear LED status       [*]
------------------------------------------------------------------------------------------------------
[*]                               [*]                     Power Plug, Switch and            [*]
                                                          Distribution Panel
------------------------------------------------------------------------------------------------------
[*]                               [*]                     Remote Switch software            [*]
------------------------------------------------------------------------------------------------------
[*]                               [*]                     Extended Fabric software          [*]
------------------------------------------------------------------------------------------------------
[*]                               [*]                     Fabric Manager 3.x                [*]
------------------------------------------------------------------------------------------------------
</TABLE>

3.      Add the following after the pricing table in Section 2.1, "Pricing":

"Supplier shall provide Buyer with a price reduction proposal by April 12, 2002
for Part Number 18P5017 (SW12000 Switch Blade 16 port, 2Gb). Buyer has the
option to either accept or reject Suppliers proposal, in the case Buyer does not
accept Suppliers proposal, the unit price in effect will be referenced by a
"***" for only the SW12000 (32 port, 64 port, and 128 port) core switch and
SW12000 switch blade."

4.      Delete Section 2.4, Lead Time, and replace with the following:

"Product lead time is [*] prior to Delivery date with the exception of the
following: a) the first initial production release purchase order for a new
Product will be [*] prior to delivery date and b) part number 18P5005 (SW12000)
and part number 18P5017 (SW12000, Switch Blade 16-port, 2Gb) will be [*] from
purchase order date to Delivery subject to the terms as set forth in Section
4.0, Replenishment Logistics Attachment."

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

                                       3
<PAGE>
5.      Add after the first sentence in Section 4.0, "Replenishment Logistics
        Attachment" the following:

        "Supplier and Buyer will agree to terms and conditions under which the
        parties will enter into a Replenishment Logistics for the SW12000
        products, which both parties agree in good faith to negotiate and
        incorporate into this Agreement by April 19, 2002."

6.      Add after the second sentence in Section 9.3, "Post Warranty Services,"
        "Pricing" as follows:

        "The post Warranty repair pricing for the following products will be
        provided by Supplier no later than April 30, 2002 for the following FRU
        part numbers 18P5017, 18P5035, 18P5037, 18P5039, and 18P5128, subject to
        the agreement of both parties, repair pricing will be amended into to
        this Agreement."

Please have your authorized representative indicate acceptance thereof by
signing both copies of the Amendment and returning one copy to the attention of
Karen Takahashi at 5600 Cottle Road, San Jose, California 95193.

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:                                            By:
   ----------------------------------------       ------------------------------
Authorized Signature           Date            Authorized Signature        Date

                                               Mr. Jay Kidd
------------------------------------------     ---------------------------------
Type or Print Name                             Type or Print Name

                                               Vice President Product Marketing
------------------------------------------     ---------------------------------
Title & Organization                           Title & Organization
</TABLE>

                                       4<PAGE>
                                                                    Exhibit 10.4

May 16, 2001

Brocade Communications Systems, Inc.
1901 Guadalupe Parkway
San Jose, CA  95131

Attention:  Mr. Patrick Johnston

Subject: Amendment 1 to SOW#4900SJ0003 of the IBM/Brocade Goods Agreement
ROC-P-68

Dear Patrick:

This letter serves as Amendment Number 1 to SOW#4900SJ0003 of the Goods
Agreement ROC-P-68 which the parties thereto do mutually agree to amend as
follows:

1.      Section 2.1, Pricing, add the following to the pricing table.

<TABLE>
<CAPTION>
---------------------------------------------------------------------------------------------------
           IBM P/N                     BROCADE P/N                 DESCRIPTION          UNIT PRICE
---------------------------------------------------------------------------------------------------
<S>                            <C>                          <C>                         <C>
[*]                            [*]                          Fabric Switch SW2040        [*]
---------------------------------------------------------------------------------------------------
[*]                            [*]                          Fabric Watch License        [*]
---------------------------------------------------------------------------------------------------
</TABLE>

The parties acknowledge that they have read this Amendment, understand it, and
agree to be bound by its terms and conditions. Further, they agree that this
Amendment and the subject Agreement 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.

Please have your authorized representative indicate acceptance thereof by
signing both copies of the Amendment and returning one copy to the attention of
Karen Takahashi at 5600 Cottle Road, San Jose, California 95193.

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

By:                                             By:
   ----------------------------------------        --------------------------------
   Authorized Signature          Date              Authorized Signature       Date

-------------------------------------------     -----------------------------------
Type or Print Name                              Type or Print Name

-------------------------------------------     -----------------------------------
Title & Organization                            Title & Organization
</TABLE>

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

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