R3303-HP HSR6800 Routers High Availability Configuration Guide

5
Configuring active and standby switchover
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 MPU with a smaller
slot number as the active MPU, and the other MPU 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 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
• The tasks in this chapter can be performed only when the device is operating in standalone mode.
In IRF mode, only the display switchover state command takes effect. For more information about
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
Ignoring version check of the standby MPU
When the standby MPU attempts to start up, the system by default examines its software version against
the software version on the active MPU for inconsistency. If the versions of the active MPU and standby
MPU are not consistent, the standby MPU cannot be started.
To disable the system from examining the software version of the standby MPU: