Description

Customer was observing below alarms and log messages post the upgrade went through successfully.

 

Router#MX960> show chassis alarms 

 

Mar 06 03:17:53

 

2 alarms currently active

Alarm time    Class Description

2024-03-04 03:05:53 +02 Minor CPU DRAM size mismatch for Master and Backup RE

2024-03-04 02:35:26 +02 Major CB 1 ESW PFE Port Fail

 

 

Mar 4 02:35:26.568 Router#MX960 alarmd[25230]: Alarm set: RE id=1073742185, color=YELLOW, class=CHASSIS, reason=CPU DRAM size mismatch for Master and Backup RE

Mar 4 02:35:26.568 Router#MX960 craftd[24581]: Minor alarm set, CPU DRAM size mismatch for Master and Backup RE

Mar 4 02:35:26.568 Router#MX960 chassisd[24578]: CHASSISD_REPLICANT_RE_DRAM_SIZE_MISMATCH: RE CPU DRAM size mismatch detected, RE0:16321MB RE1:8129MB

 

Symptoms

You will be observing the below output for DRAM size through CLI is showing different numbers. However you will see in the backend as 16GB for RE1.

 

root@Router#960> show chassis routing-engine | match DRAM 

Mar 06 04:04:27

 DRAM   16321 MB (16384 MB installed)

 DRAM   8129 MB (8192 MB installed)

 

root@Router#960> start shell 

Mar 04 03:34:24

% sysctl hw | egrep 'hw.(phys|user|real)'

hw.physmem: 17113362432

hw.usermem: 14861414400

hw.realmem: 17179869184

% exit 

 

Solution

 

With above CB1 related alarms ( ESW port fail) we shouldn't interpret it is a CB1 issue, we need to check for the additional boot log messages on RE1, where we observed HDD related errors as well.

 

Faulty RE got replaced and recovered the services

 

 

Modification History

2024-03-31 : Article Created