Configuration Guide User guide

FastIron Configuration Guide 103
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Hitless management on the FSX 800 and FSX 1600
NOTE
Since both the standby and active management modules run the same code, a command that
brings down the active management module will most likely bring down the standby management
module. Because all configuration commands are synchronized from active to standby
management module in real time, both management modules will reload at almost the same time.
This in turn will cause the system to reset all interface modules (similar to the behavior when the
reboot command is executed) and will cause packet loss associated with a system reboot.
NOTE
If the new active management module becomes out-of-sync with an interface module, information
on the interface module can be overwritten in some cases, which can cause an interruption of traffic
forwarding.
How a Hitless switchover or failover impacts system functions
Fora description of the feature’s impact to major system functions, refer to Table 18 on page 99.
Enabling hitless failover on the FSX 800 and
FSX 1600
Hitless failover is disabled by default. When disabled, the following limitations are in effect:
• If a failover occurs, the system will reload. The following message will display on the console
prior to a reload.
STBY:- - - - Active Hitless Failover is disabled. Re-setting the system - -
• Manual switchover (CLI command switch-over-active-role) is not allowed. If this command is
entered, the following message will display on the console:
Switch-over is not allowed. Reason: hitless-failover not configured.
NOTE
Hitless OS upgrade is not impacted by this option and is supported whether or not hitless failover is
enabled.
NOTE
Synchronization between the active management module and standby management module will
occur whether or not hitless failover is enabled.
To enable hitless failover, enter the following command at the Global CONFIG level of the CLI:
Brocade(config)#hitless-failover enable
The command takes effect immediately. Manual switchover is allowed, and in the event of a
failover, the standby management module will take over the active role without reloading the
system.
Syntax: [no] hitless-failover enable
Use the no form of the command to disable hitless failover once it has been enabled.