H3C Technologies H3C SR6600-X - Manual (Page 82)

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Task Command Remarks
Display the current alarm
information of the transceiver
module in a specified interface.
display transceiver alarm interface
[ interface-type interface-number ] Available for all transceiver
modules.
For more information about the transceiver module displaying commands, see H3C SR6600/SR6600-X
Routers Command References.
Active and standby switchover for MPUs
CAUTION:
Do not execute any command on the standby MPU.
A router can be configured with two MPUs of the same model, one acting as the active MPU and the
other as the standby MPU. The standby MPU uses the synchronization function to keep its configuration
consistent with the current configuration of the active MPU. When the active MPU fails, the standby MPU
immediately takes over using the same configuration as the previous active MPU, and guarantees that the
router operates correctly. The process is called an active and standby switchover.
An active and standby switchover is triggered in the following conditions:
• The active MPU fails.
• The active MPU is unplugged.
• Remotely performing an active and standby switchover through SNMP.
• Manually executing the command for active and standby switchover.
Active/standby switchover is implemented in the following workflow:
1. The standby MPU automatically connects to and controls the system bus, and at the same time, the
former active MPU disconnects from the system bus.
2. The standby MPU becomes an active MPU, and the former active MPU automatically reboots and
becomes a standby MPU.
You can use the slave switchover command to trigger an active and standby switchover. For more
information about the command, see H3C SR6600/SR6600-X Routers High Availability Command
Reference.
When the standby MPU is started, the active MPU performs initial synchronization for the standby MPU.
During the synchronization process, if you press Enter on the configuration terminal, the system prompts
that you cannot execute any command on the active MPU or standby MPU. After the initial
synchronization process is complete, you can execute configuration commands on the active MPU, and
the configurations of the active MPU are real-time synchronized (copied) to the standby MPU, so that the
active MPU and the standby MPU can have the same configurations.