Description of the problem

Huawei Metro1000V3 transmission device initialization configuration is restored after power down and reboot. (The command used is cfg-init-all)

Processing

Analyze the database recovery process when the network element is powered down and restarted as follows:

The master first checks whether there is any configuration data in the DRDB library. If there is, the data is recovered from the DRDB library for verification; if the data in the DRDB library is corrupted, it is recovered from FDB0 and FDB1. When recovering, if there is data in both FDB0 and FDB1, first compare the backup time of the two libraries and prioritize the recovery of the newer library. If there is data in only one library, the data cannot be recovered automatically. Therefore, when performing a database backup, not only FDB0 but also FDB1 should be backed up. otherwise, when the DRDB library is destroyed, the data cannot be recovered from the FDB library. At this time, if you want the network element to use the configuration data in the FDB library, you need to restore the data in the FDB library to the DRDB library by manual methods.

Therefore, after using the initialization command to clear the configuration, it can be understood that what is cleared is the data on the running memory, and at this time, the network element is immediately powered down, and it will be recovered from FDB0 and FDB1.

The solution is as follows

1. Wait for 30 minutes, and the network element will back up the data from the DRDB library to FDB0 and FDB1.

2、Run the following two commands to achieve the effect of 1.

:dbms-copy-all:drdb,fdb0.

:dbms-copy-all:drdb,fdb1.

The problem is solved by following solution 2 in the field.

Root Cause

Did not wait 30 minutes for the network element to power down and reboot, it will restore the configuration data from FDB0 and FDB1.

Solution

You also need to run the following two commands to back up empty data.

:dbms-copy-all:drdb,fdb0.

:dbms-copy-all:drdb,fdb1.

Suggestions and Summary

It is recommended to turn on the automatic backup and periodic backup functions of the network element to prevent the configuration from being lost when the network element is powered down.

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