Brocade Multi-Service IronWare Switching Configuration Gui Manual de usuario descargar pdf (Pagina 81)

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Multi-Service IronWare Switching Configuration Guide 51

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How management module redundancy works

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

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