Brocade FastIron Ethernet Switch Stacking Configuration Guide - Manual (Page 113)

Hitless switchover can be used by a system administrator, for example, to perform maintenance on a
controller that has been functioning as the active controller.
For a description of the events that occur during a hitless stacking switchover, refer to What happens
during a hitless stacking switchover or failover on page 102.
For a description of this feature’s impact on major system functions, refer to Supported hitless stacking
protocols and services on page 97.
For examples of hitless stacking switchover operation, refer to Hitless stacking switchover examples on
page 111.
Executing a hitless stacking switchover
The following must be in effect before a hitless switchover (switch over to the standby controller) is
allowed:
• Hitless stacking is enabled
• The stack has a standby controller
• The standby controller has learned the protocols
• The standby controller has the same priority as the active controller
• More than 120 seconds have passed since the previous switchover or failover
You can use the show stack command to view whether or not these properties are in effect.
To perform a switchover, enter the following command:
device# stack switch-over
Standby unit 8 will become active controller, and unit 1 will become standby
Are you sure? (enter 'y' or 'n'): y
Unit 1 is no longer the active controller
Syntax: stack switch-over
Hitless stacking switchover examples
This section illustrates hitless stacking failover and switchover operation during a CLI-driven switchover
or priority change.
Executing a hitless stacking switchover
FastIron Ethernet Switch Stacking Configuration Guide 111
53-1003090-02