Brocade Fabric OS Command Reference Manual (53-1000240-01, November 2006)

2-138 Fabric OS Command Reference Manual
Publication Number: 53-1000240-01
dlsSet
2
Note: Enter commands in lowercase only; mixed case is for readability.
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 generally based on the incoming port and the destination domain. This means that all the
traffic coming in from a port (either an E_Port or an Fx_Port) directed to the same remote domain is
routed through the same output E_Port.
To optimize fabric routing, when there are multiple equivalent paths to a remote domain, traffic is shared
among all thse paths. Regardless of the setting of the DLS option, when ports come up, new routes are
always added to optimize load sharing. Furthermore, when DLS is enabled, load sharing recomputed
after 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 might be moved to maintain optimal balance. This
can 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.
The DLS option is on by default.
N
ote
DLS is not supported in certain routing policies. Refer to aptPolicy for more information on routing
policies.
N
ote
The execution of this command is subject to Admin Domain restrictions that may be in place.
Operands none
Examples To enable the dynamic load sharing option:
See Also aptPolicy, dlsReset, dlsShow, iodReset, iodSet, iodShow, uRouteShow, topologyShow
switch:admin> dlsset
switch:admin> dlsshow
DLS is set