For analysis of the problem we analyzed the alarms log for both the NE’s of site A and site B. It was found that there are alarms of RLOS, APS_INDI and MS_APS_INDI_EX on the site A node but on the site of siteB there were no such alarms of protection switching. Then I checked the MSP configuration of the site B node. When I queried the MSP switching status of site B site then it gave me error on T2000 as shown in attached Figure-2.
After that I used the command line to check the status of the issue and it gave me error on the navigator also shown in attached Figure-3. The software version of the nodes was 220.127.116.11. I checked the issues of this particular version. But I could not found any problem of MSP. On further investigation it was found that problem occurred due to the 24 bytes memory block overwrite problem. These overwrite the class’s v-ptr which reset the SCC on saving the database and finally cause the configuration database abnormal. After that some of the configurations like enable MSP protocol didn’t send to EXCS Board. The 24 bytes block was based on dynamic allocate memory, then we changed the method to static allocate which could solve this problem.