R3102-R3103-HP 6600/HSR6600 Routers High Availability Configuration Guide

5
Configuring active and standby switchover
This feature is supported only by 6604/6608/6616 routers.
If a device has two MPUs, the MPU that forwards and processes packets is called the active MPU,
and the MPU that is in the standby state is called the standby MPU. The system uses the main board
with a smaller slot number as the active MPU, and the other main board as the standby MPU. The
standby MPU keeps its configuration the same as the active MPU through the synchronization function.
When the active MPU fails, the standby MPU becomes the active MPU to process services to ensure
the normal operation of the device. This switchover process is called an active and standby
switchover.
Active and standby switchover functions in the following two ways:
 Automatic active and standby switchover. If the active MPU fails or is removed, the system
automatically performs an active and standby switchover to enable the standby MPU to function
as the active MPU.
 Manual active and standby switchover, which is an active and standby switchover performed at
the command line interface.
Configuring active and standby switchover
 When the device is operating in standalone mode, you can use the features and functions in this
chapter to restart the standby main processing unit (MPU) to perform an active and standby
switchover, thus to implement redundant backup between the active MPU and the standby MPU;
when the device is operating in IRF mode, which applies to distributed devices–in IRF mode, you
can only use the display switchover state command to view the backup state of the main boards,
and other functions and commands do not take effect. For introduction to IRF, see IRF
Configuration Guide.
 Active/standby switchover configuration tasks must be performed at the CLI of the active MPU.
The system can automatically propagate the configuration to the standby MPU.
Active and standby switchover configuration task
list
Task
Remarks
Ignoring version check of the standby MPU
Optional
Restarting the standby MPU
Optional
Manually performing an active and standby switchover
Optional