Redundancy (Switches 8200zl)

Management Module Switchover

Management Module SwitchoverEvents that Cause a Switchover

There are a number of events that can cause the active management module to switchover to the standby management module when redundancy is enabled:

The active management module crashes

The standby management module does not receive a heartbeat from the active management module

The redundancy switchover command is executed

The active management module is hotswapped out

The MM Reset button on the active management module is pressed

The MM Shutdown button on the active management module is pressed

The boot or boot active command is executed

The reload command is executed

There is a hardware failure on the active management module

In all of these cases the standby management module takes control and performs the actual switchover. The reason for the switchover is entered in log messages on the newly active management module and to any configured Syslog servers.

When Switchover Will not Occur

There are some events for which a switchover is not triggered:

When a boot system command is executed

When the Clear button on the System Support module is pressed

When redundancy is disabled, unless there is a hardware failure and the system is rebooted.

Consequences of Switchover

When a switchover occurs, the standby management module completes its boot process and reloads all the interface modules. The following information is not saved:

Port Counter information (counters are reset)

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