Configuration Guide User guide

342 FastIron Configuration Guide
53-1002494-02
Hitless stacking
Syntax: show stack
Hitless stacking failover
Hitless stacking failover provides automatic failover from the Active Controller to the Standby
Controller without resetting any of the units in the stack and with sub-second or no packet loss to
hitless stacking-supported services and protocols.
For a description of the events that occur during a hitless failover, refer to “What happens during a
hitless stacking switchover or failover” on page 333.
For a description of this feature’s impact on major system functions, refer to Table 56 on page 330.
For an example of hitless failover operation, refer to “Hitless stacking failover example” on
page 343.
For feature limitations and configuration notes, refer to “Hitless stacking configuration notes and
feature limitations” on page 333.
Enabling hitless stacking failover
To enable hitless stacking failover, enter the following command at the global CONFIG level of the
CLI:
Brocade(config)#hitless-failover enable
The command takes effect immediately. Hitless switchover is allowed, and in the event of a failover,
the standby controller will take over the active role without reloading the stack.
Syntax: [no] hitless-failover enable
Use the no form of the command to disable hitless stacking once it has been enabled.
Brocade#show stack
alone: standalone, D: dynamic config, S: static config
ID Type Role Mac Address Pri State Comment
2 S FCX648S member 0000.0000.0000 0 reserve
3 S FCX624 standby 0024.3876.2640 200 remote Ready, active if reloaded
5 S FCX624 member 00e0.5200.0400 128 remote Ready, standby if reloaded
8 S FCX648 active 0024.3877.7980 128 local Ready, member if reloaded
active standby
+---+ +---+ +---+
-2/1| 8 |2/2--2/2| 3 |2/1--2/1| 5 |2/2-
| +---+ +---+ +---+ |
| |
|-------------------------------------|
Standby u3 - No hitless failover. Reason: hitless-failover not configured