On MX960 Series routers, you may observe that the craft interface RED Alarm LED is ON but after checking the device and logs, you find that there is no active alarm.

This article indicates that restarting the craftd process during a Maintenance Window should help resolve the alarm although no service impact is expected while restarting craftd.

The craft interface RED alarm LED is ON on MX960 but no active alarm is seen in the logs.

From the messages logs, you can see that the last RED alarm was for PEM1 and that the alarm was cleared, but craftd failed to change the status for the LED, resulting in the following error: "craftd[24004] fpm led error: Operation not permitted"

Jun 8 23:56:15 mx960-re0 alarmd[26704]: Alarm cleared: Pwr supply id=251658597, color=RED, class=CHASSIS, reason=PEM 1 Too many I2C Failures
Jun 8 23:56:15 mx960-re0 craftd[24004]: Major alarm cleared, PEM 1 Too many I2C Failures
:
Jun 8 23:56:15 mx960-re0 craftd[24004]: iic_smb_read_generic: failed reading data (ret = -1) [Operation not permitted]
Jun 8 23:56:15 mx960-re0 craftd[24004]: fpm led error: Operation not permitted
Jun 8 23:56:15 mx960-re0 craftd[24004]: iic_smb_read_generic: failed reading data (ret = -1) [Operation not permitted]
Jun 8 23:56:15 mx960-re0 craftd[24004]: fpm led error: Operation not permitted

To resolve this issue, we recommend that you restart craftd by using the following command:

cli> start shell user root
<=need the root password 
# kill `cat /var/run/craftd.pid`

Note: There is no known service impact for restarting craftd but we recommend that you perform this during a Maintenance Window.

2023-07-19: Initial version