Brocade Communications Systems Brocade Superx Series Installation Guide download pdf (Page 108)

96 Brocade FastIron SX Series Chassis Hardware Installation Guide

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How Management module redundancy works

After the active and standby modules are determined, both modules boot from the source specified

for the active module. The active management module boots from the active management

module’s flash memory.

After the modules boot, the active module synchronizes the standby module’s flash code and

system-config file with its own.

During normal operation, the active module handles tasks such as obtaining network topology and

reachability information and determining the best paths to known destinations. The active module

also monitors the standby module.

The standby module functions in an active standby mode. Keeping the system-config and

running-config files on both modules synchronized allows the standby module to assume the role of

active module seamlessly if necessary.

During a switchover, the standby management module takes over the active role and re-initializes

all the interface modules in the system that are not CLI-disabled by the administrator. This may

cause a brief interruption of the traffic forwarding.

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.

When 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 role of active management module from

the currently active module to the standby module. For instance, when you want to remove the

current active management module for maintenance. For example, if the module in slot 10 is the

active module and the module in slot 9 is the standby module and you want the module in 9 to be

the active module and the module in 10 to be the standby module, you can perform a manual

switchover using the switch-over-active-role command.

For information about performing this task, refer to “Manually switching over to the standby

management module” on page 100.

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Brocade Communications Systems Brocade Superx Series Installation Guide Page 108