Alert Type

PSN - Product Support Notification
Low/NotificationThe symptom may end up with unnecessary hardware swap/RMA
Low/NotificationAn FPC can be stuck in present state

Product Affected

MX240 MX480 MX960 MX304 MX2008 MX2010 MX2020 MX10003 MX10008 MX10016 PTX3000 PTX5000

Alert Description

When an FPC is automatically shutdown due to overtemp condition, some FPC models can be stuck in Present state.
Once an fpc runs into this condition, 'request chassis fpc <> online' will not be able to make it online.

When the issue happening, you may observe the following messages in /var/log/chassisd
 fpc_ok_to_start_generic: [FPC 0] gracefull offline in progress, returning false
 

Affected FPC models

MX240/MX480/MX960/MX2008/MX2010/MX2020
  • MPC7E
  • MPC8E  
  • MPC9E
  • MPC10E
  • MPC11E

MX10004/MX10008/MX10016
  • LC480
  • LC2101
  • LC9600

MX304

PTX3000
  • FPC3-SFF-PTX-1X
PTX5000
  •  FPC-P2
  •  FPC-P3

Solution

This is day-1 issue and tracked under PR1676008 Please refer to the PR for fixed Junos versions

As a short-term workaround once an FPC runs into this situation, restarting chassisd process with a CLI command on GRES enabled system will resolve the problem.
 restart chassis-control immediately
 (NOTE: Above command reboots all FPCs if GRES is disabled on the system)
 

Modification History

2022-09-09 ready to externally published
2022-08-24: publish internally 
2022-08-22: First draft. Still need to check affected FPC models