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[QFX/PTX] Alarm 'Minor FPC 2 Need bounce'

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Article ID: KB36755 KB Last Updated: 03 May 2021Version: 2.0
Summary:

The following alarm is seen when the make port speed changes:

user@router> show chassis alarms
2 alarms currently active
Alarm time               Class  Description
2021-03-29 16:20:32 PDT  Minor  FPC 2 Need bounce
2021-03-29 16:20:32 PDT  Minor  FPC 3 Need bounce
Symptoms:

The issue is confirmed when checking the message logs in chassisd:

Mar 29 16:20:32  tvp_pic_process_tpic_port_map FPC 3 PIC 0 Port speed configuration, requires FPC reboot, raising Alarm
Mar 29 16:20:32  ch_tvp_ng_send_alarm_request: fru_type=3, slot=0, reason=62
Mar 29 16:20:32  send: yellow alarm set, device FPC 3, reason FPC 3 Need bounce
Mar 29 16:20:32  tvp_pic_process_tpic_port_map FPC 2 PIC 0 Port speed configuration, requires FPC reboot, raising Alarm
Mar 29 16:20:32  ch_tvp_ng_send_alarm_request: fru_type=3, slot=0, reason=62
Mar 29 16:20:32  send: yellow alarm set, device FPC 2, reason FPC 2 Need bounce
Checking the interactive commands show the config changes that were made:
Mar 29 16:20:32  labbox mgd[86080]: UI_CMDLINE_READ_LINE: User 'test', command 'set chassis fpc 2 pic 0 port 20 speed 10g '
Mar 29 16:20:32  labbox mgd[86080]: UI_CMDLINE_READ_LINE: User 'test', command 'set chassis fpc 2 pic 0 port 21 speed 10g '
Mar 29 16:20:32  labbox mgd[86080]: UI_CMDLINE_READ_LINE: User 'test', command 'set chassis fpc 2 pic 0 port 22 speed 10g '
Mar 29 16:20:32  labbox mgd[86080]: UI_CMDLINE_READ_LINE: User 'test', command 'set chassis fpc 2 pic 0 port 23 speed 10g '
Mar 29 16:20:32  labbox mgd[86080]: UI_CMDLINE_READ_LINE: User 'test', command 'set chassis fpc 2 pic 0 port 24 speed 10g '
Cause:

Originally, this change will automatically reboot the FPC. However, the behavior has been changed so users can manually schedule a reboot later to the corresponding FPCs without affecting productivity. Change in port speed will only take effect after restarting the FPC.

Solution:

Restart the FPC during a maintenance window to avoid traffic impact and to make the port speed change effective.

Example for bouncing (restarting) an FPC:

request chassis fpc restart slot 0 
 

Modification History:
2021-05-03: Added example for restarting (bouncing) and FPC.
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