Brocade Fabric OS Administrators Guide (Supporting Fabric OS v7.3.0) - Manual (Page 108)

Dynamic Load Sharing
The Fabric OS Dynamic Load Sharing (DLS) feature for dynamic routing path selection is required by
the exchange-based and device-based routing policies. When using these policies, DLS is enabled by
default and cannot be disabled. In other words, you cannot enable or disable DLS when the exchange-
based routing policy is in effect.
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
Use the following procedure to set DLS.
1. Connect to the switch and log in using an account with admin permissions.
2. Enter the dlsShow command to view the current DLS setting.
One of the following messages appears:
• "DLS is set with Lossless disabled" indicates that DLS is turned on.
• "DLS is not set with Lossless disabled" 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 with Lossless disabled
switch:admin> dlsset
switch:admin> dlsshow
DLS is set with Lossless disabled
switch:admin> dlsreset
switch:admin> dlsshow
DLS is not set with Lossless disabled
Dynamic Load Sharing
108 Fabric OS Administrators Guide
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