Fabric OS Administrator's Guide v7.0.0 (53-1002148-02, June 2011)

Fabric OS Administrator’s Guide 75
53-1002148-02
Route selection
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When the port-based policy is in force, you can enable DLS to optimize routing. When DLS is
enabled, it shares traffic among multiple equivalent paths between switches. DLS recomputes load
sharing when any of the following occurs:
• A switch boots up
• An E_Port goes offline and online
• An EX_Port goes offline
• A device goes offline
Setting DLS
1. Connect to the switch and log in as admin.
2. Enter the dlsShow command to view the current DLS setting.
One of the following messages appears:
• “DLS is set” indicates that DLS is turned on.
• “DLS is not set” indicates that DLS is turned off.
• ”DLS is set with Lossless enabled.” DLS is enabled with the Lossless feature. Load sharing
is recomputed with every change in the fabric, and existing routes can be moved to
maintain optimal balance. In Lossless mode, no frames are lost during this operation.
• "DLS is set by default with current routing policy. DLS is set with Lossless enabled." The
current routing policy (exchange-based) requires DLS to be enabled by default. In addition,
the Lossless option is enabled. Frame loss is prevented during a load sharing
recomputation. If you get this message, you cannot perform step 3, so you are done with
this procedure.
3. Enter the dlsSet command to enable DLS or enter the dlsReset command to disable it.
Example of setting and resetting DLS
switch:admin> dlsshow
DLS is not set
switch:admin> dlsset
switch:admin> dlsshow
DLS is set
switch:admin> dlsreset
switch:admin> dlsshow
DLS is not set
Static route assignment
A static route can be assigned only when the active routing policy is port-based routing. When
exchange-based routing is active, you cannot assign static routes.
Static routes are supported only on the Brocade 4100 and 5000 platforms.
Static routes are not supported on the Brocade 300, 5100, 5300, 5410, 5424, 5450, 5460, 5470,
5480, 6510, 7800, 8000, and VA-40FC switches, the Brocade DCX, DCX-4S, or DCX 8510
enterprise-class platforms (all 4 Gbps ASICs and later). Instead, use the traffic isolation zoning
feature to create a dedicated path for inter-switch traffic. For information about this feature, refer to
Chapter 12, “Traffic Isolation Zoning”.