Description of the problem

An OSN3500, the version of the network element is 5.21.16.13, and the target version of the upgrade is 5.21.18.50P01. The upgrade tool used is DC, the version is V2R2C01SPC100, and the upgrade method is using the analog package. If SSN3GSCC01 is the primary master, SSN3GSCC02 is the backup master. After completing the activation steps, the standby master cannot be activated and reports COMMUN_FAIL

Processing

See Problem Causes and Solutions.

Root cause

With the old DC version, the backup master is directly synchronizing the software of the master, which software the master loads, the backup master will synchronize. If the backup master, the backup master will not be able to start normally after reset.

Solution

Emergency recovery measures are: replace the board. Complete solution for: DC V2R2C01SPC100 after version solution.

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