Brocade Fabric OS Command Reference Guide v6.1.0 (53-1000599-02, June 2008)

Fabric OS Command Reference 117
53-1000599-02
dlsSet
2
dlsSet
Enables the dynamic load sharing (DLS) option.
Synopsis dlsset
Description Use this command to turn on DLS when a fabric change occurs.
Routing is based on the incoming port and the destination domain. This means that all traffic
coming in from a port (either from an E_Port or an Fx_Port) and directed to the same remote
domain is routed through the same output E_Port.
Dynamic Load Sharing (DLS) optimizes fabric routing. When DLS is enabled and there are multiple
equivalent paths to a remote domain, traffic is distributed among all these paths. Regardless of the
setting of the DLS option, when a port comes online, its new route (selected out-port) is chosen to
optimize load sharing. Whether pre-existing routes are recomputed or rebalanced is determined by
the given DLS settings.
Furthermore, when DLS is enabled, load sharing is recomputed after any one of the following
events:
• A change in the fabric occurs.
• A local E_Port goes up or down.
• A local Fx_Port goes down.
During load sharing recomputation, existing routes may be moved to maintain optimal load
balance. This may cause momentary frame loss along these routes.
In contrast, if DLS is turned off (using dlsReset), load sharing calculations are used only to place
new routes. Once placed, existing routes are never moved from one output E_Port to another
unless the original output E_Port is no longer a recognized path to the remote domain. Optimal
balance is rarely achieved with this setting.
Notes DLS is not supported in certain routing policies. If supported, the DLS option is on by default. Refer
to aptPolicy help for more information on routing policies.
The execution of this command is subject to Admin Domain restrictions that may be in place. Refer
to chapter 1, "Understanding Admin Domain Restrictions" and Appendix A, "Command Availability"
for details.
Operands none
Examples To enable the dynamic load sharing option:
switch:admin> dlsset
switch:admin> dlsshow
DLS is set
See Also aptPolicy, dlsReset, dlsShow, iodReset, iodSet, iodShow, uRouteShow, topologyShow