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Management module switchover
The following events cause the standby management module to become the active
module, which is called a switchover:
v The active module becomes unavailable
v You perform a manual switchover
v 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:
v An active module experiences a problem significant enough to cause a reset of
v 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.
To read additional information about performing this task, see "Manually switching
over to the standby management module" on page 80.
When the switchover occurs, the standby module becomes the active module.
Starting in software release 05.0.00, hitless switchover is supported. For more
information, see "Layer 2 hitless switchover" on page 83.
Removal and replacement of a management module
To read additional information about how to remove and replace a management
module, see "Replacing a management module" on page 91.
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 role of the active module. After you insert a replacement module in the
slot from which the original active module was removed, the replacement module
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Ethernet Switch s-series Installation and User Guide
the module.
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