Brocade Multi-Service IronWare Switching Configuration Guide (Supporting R05.6.00) - Manual (Page 81)

Multi-Service IronWare Switching Configuration Guide 51
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How management module redundancy works
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failover. Brocade devices support Layer 3 hitless failover with restart for high-availability routing in
protocols such as BGP and OSPF. With these high-availability features enabled, when a device
experiences a failover or restart, forwarding disruptions are minimized, and route flapping
diminished to provide continuous service.
Management module switchover
The following events cause the standby management module to become the active module, which
is called a switchover:
• The active module becomes unavailable
• You perform a manual switchover
• You remove and replace the active management module
The following sections explain how the switchover occurs for each event.
Unavailable active module
The following events cause an active module to become unavailable and a switchover to occur:
• An active module experiences a problem significant enough to cause a reset of the module
• The active module loses power
Before a switchover occurs, the active module resets itself and sends an interrupt signal to the
standby module. The standby module then becomes the active module and the interface modules
continue to forward traffic.
The new active module begins to manage the system. When the original active module becomes
available again or is replaced, it assumes the role of standby module.
Manual switchover
In some situations, you may want to manually switch the active module to the standby module. You
can perform a manual switchover using the switchover command. For information about
performing this task, refer to
“Manually switching over to the standby management module” .
When the switchover occurs, the standby module becomes active and the active module becomes
standby.
Removal and replacement of a management module
For information about how to remove and replace a management module, refer to “Replacing a
Management Module” in the appropriate installation guide.
This section explains how management module redundancy is affected when you remove and
replace an active or standby management module.
Removal and replacement of an active management module
If you remove the active management module, the standby module automatically assumes the
active role. When you insert a replacement module in the slot from which the original active module
was removed, the replacement module assumes the standby role. This module boots from a source
specified for the active module, for example:
• The flash memory on the active management module