Active And Standby Switchover Configuration; Introduction To Active And Standby Switchover - H3C S9500E Series Configuration Manual

Active and standby switchover configuration

The switch operates in IRF or standalone (the default) mode. For more information about the IRF mode,
•
see IRF in the IRF Configuration Guide.
When the device works in standalone mode, you can use the features and functions in this manual to
•
restart the SMB to perform an active and standby switchover, to implement redundant backup between
the AMB and the SMB. When the device works 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.

Introduction to active and standby switchover

If a device has two main boards, the main board that forwards and processes packets is called
the AMB, and the main board that is in the standby state is called the SMB. The system uses the
main board with a smaller slot number as the AMB, and the other main board as the SMB. The
SMB keeps its configuration the same as the AMB through the synchronization function. When
the AMB fails, the SMB becomes the AMB 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 AMB fails or is disconnected, the system
automatically performs an active and standby switchover to enable the SMB to function as
the AMB.
•
Manual active and standby switchover, which is an active and standby switchover
performed at the command line interface. For example, when you upgrade a device, you
can upgrade the SMB first, and then perform an active and standby switchover to upgrade
the AMB, to upgrade the entire device. This greatly reduces the interruption time of services.
When you upgrade the device by performing an active and standby switchover, the current
software version must be gracefully upgraded (that is, the differences between the new version
and the current version are relatively small.); otherwise, the SMB may not be started. To upgrade
a device by performing an active and standby switchover:
Download the newest software version to the AMB and SMB.
1.
Specify the boot file to be used at the next startup of the AMB and SMB as the newest
2.
software version.
Ignore version check for the SMB.
3.
Manually restart the SMB to upgrade the SMB.
4.
Manually perform an active and standby switchover. Then the SMB becomes the AMB,
5.
taking over from the original AMB, and the original AMB automatically restarts, using the
new version to upgrade the device.
17