15-13
Redundancy (Switch 8212zl)
Management Module Switchover
Management Module Switchover
Events 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 Rese
t 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)
3500-5400-6200-8200-MCG-Jan08-K_13_01.book Page 13 Monday, January 28, 2008 10:04 AM