This article explains how to deal with the major alarm PEM <X> Watchdog Not supported

You will observe the below alarm on the device

4 alarms currently active

Alarm time              Class Description

2024-07-25 13:02:07 PDT Major PEM 3 Watchdog Not supported

2024-07-25 13:02:07 PDT Major PEM 2 Watchdog Not supported

2024-07-25 13:02:07 PDT Major PEM 1 Watchdog Not supported

2024-07-25 13:02:07 PDT Major PEM 0 Watchdog Not supported

Generally, Junos detects the thermal event health events and takes the required action as per user configuration. However, if a thermal health event causes Junos to go down, the PSM watchdog feature detects it and shuts down the router.

https://www.juniper.net/documentation/us/en/software/junos/cli-reference/topics/ref/statement/watch-dog-edit-chassis.html

Please note that PEM firmware upgrade is required for the PSM watchdog feature. When you configure the watchdog feature on a PSM with outdated firmware, the system will raise a Watchdog Not Supported alarm.

Hence will suggest you to upgrade the firmware by using the below command.

> request system firmware upgrade pem slot <slot-no>

https://www.juniper.net/documentation/us/en/software/junos/cli-reference/topics/ref/command/request-system-firmware-upgrade.html

Current Firmware :

root@RE0> show system firmware

Part            Type             Tag Current              Available            Status

                                      version              version

FPC 0                             0  0.0.0                71.63d               OK

Routing Engine 0                  0  0.0.0                0                    OK

Power Supply 0  PSU AC           1  0.3.96               0.3.98               OK

Power Supply 1  PSU AC           1  0.3.96               0.3.98               OK

Power Supply 2  PSU AC           1  0.3.96               0.3.98               OK

Power Supply 3  PSU AC           1  0.3.96               0.3.98               OK