Dynamic Load Sharing - HP SN3000B Administrator's Manual

Dynamic Load Sharing

The exchange-based routing policy depends on the Fabric OS Dynamic Load Sharing (DLS) feature
for dynamic routing path selection. When using the exchange-based routing policy, 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:
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•
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Setting 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.
3. Enter the dlsSet command to enable DLS or enter the dlsReset command to disable it.
Example of setting and resetting DLS
Fabric OS Administrator's Guide
53-1002446-01
A switch boots up
An E_Port goes offline and online
An EX_Port goes offline
A device goes offline
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
this procedure.
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
Route selection
step 3, so you are done with
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