The alarm indicates there was a mismatch for the installed DRAM size for the RE-S-1800x4.
Dynamic random-access memory (DRAM)is the total physical memory available
When there is a mismatch of available size we will received the below chassis alarm During issue time there will a difference observed between the installed DRAM size in MB for the RE-S-1800x4
Chassis alarm -
root@Juniper1800RE> show chassis alarms no-forwarding
1 alarms currently active
Alarm time Class Description
2024-02-29 02:57:00 IST Minor CPU DRAM size mismatch for Master and Backup RE
The below logs are observed during the issue time
Messages logs :
Feb 29 02:57:00 chassisd[8656]: CHASSISD_REPLICANT_RE_DRAM_SIZE_MISMATCH: RE CPU DRAM size mismatch detected, RE0:32704MB RE1:16320MB
Feb 29 02:57:00 alarmd[9569]: Alarm set: RE id=1073742185, color=YELLOW, class=CHASSIS, reason=CPU DRAM size mismatch for Master and Backup RE
Feb 29 02:57:00 craftd[8660]: Minor alarm set, CPU DRAM size mismatch for Master and Backup RE
Chassisd logs :
Feb 29 02:57:00 RE CPU DRAM size, RE1:16320
Feb 29 02:57:00 CHASSISD_REPLICANT_RE_DRAM_SIZE_MISMATCH: RE CPU DRAM size mismatch detected, RE0:32704MB RE1:16320MB
Feb 29 02:57:00 send: yellow alarm set, device Routing Engine 1, reason CPU DRAM size mismatch for Master and Backup RE
root@Juniper1800RE> show chassis routing-engine no-forwarding
Routing Engine status:
Slot 0:
Current state Master
Election priority Master
Temperature 31 degrees C / 87 degrees F
CPU temperature 27 degrees C / 80 degrees F
DRAM 32704 MB (32768 MB installed)
Memory utilization 7 percent
5 sec CPU utilization:
User 6 percent
Background 0 percent
Kernel 5 percent
Interrupt 1 percent
Idle 89 percent
1 min CPU utilization:
User 5 percent
Kernel 4 percent
Interrupt 0 percent
Idle 92 percent
5 min CPU utilization:
User 4 percent
Kernel 3 percent
15 min CPU utilization:
Idle 93 percent
Model RE-S-1800x4
Serial ID 9016241642
Start time 2024-02-29 02:51:55 IST
Uptime 9 days, 35 minutes, 8 seconds
Last reboot reason Router rebooted after a normal shutdown.
Load averages: 1 minute 5 minute 15 minute
0.52 0.41 0.36
Slot 1:
Current state Backup
Election priority Backup
CPU temperature 29 degrees C / 84 degrees F
DRAM 16320 MB (16384 MB installed)<-- This is the total physical memory available: 16GB
Memory utilization 14 percent
User 0 percent
Kernel 0 percent
Idle 100 percent
Serial ID 9016241540
Start time 2024-02-29 02:02:18 IST
Uptime 9 days, 1 hour, 24 minutes, 41 seconds
0.20 0.23 0.19
The below action was performed during the issue time to resolve the issue in a MW
Here in the above logs issue is reported for RE1 which is showing less DRAM size in chassisd logs
-We checked the RE1 alarm and confirmed the wrong DRAM size present in "show chassis routing-engine"
-Perform a offline/online of CB1 via CLI
-RE 1 will reboot
-If issue still persist after reboot for RE1
-A physical reseat for the RE 1 was performed.
-After the reseat of RE1 the alarm has been cleared
2024-03-12 : Article Created
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