The "Queue underrun indication" reports an overflow of fabric tokens.
When a "CPQ1 Queue underrun indication" event occurs, a message similar to the following is reported:
Mar 17 10:50:22 router fpc11 XMCHIP(0): CPQ1: Queue unrderrun indication - Queue 14
Indications:
The message will be logged continuously
Permanent impact for all traffic into the fabric on the reporting PFE
Packet drops are counted as fabric drop reported with command show pfe statistics traffic
This is a transient hardware or software defect.
{DIDYOUKNOWSERVICENOWTOKEN.EN_US}
Perform these steps to determine the cause and resolve the problem (if any). Continue through each step until the problem is resolved.
Collect the show command output.
Capture the output to a file (in case you have to open a technical support case). To do this, configure each SSH client/terminal emulator to log your session.
show log messages show log chassisd start shell network pfe <fpc#> show nvram show syslog messages exit
Analyze the show command output.
In the 'show log messages', review the events that occurred at or just before the appearance of the "CPQ1 Queue underrun indiction" message. Frequently these events help identify the cause.
No RMA required.
Junos OS has been enhanced within PR1265385 to report such condition and raise a Major CMERROR Alarm.
The generic pfe-disable event script will detect a permanent impact on packet forwarding condition that happens as a result of this event and invoke the pfe-disable action”. KB31867 - [Junos] Generic pfe-disable event script [juniper.net]
Contact your technical support representative if the issue is seen after FPC restart
This article is indexed in KB31893 - Primary Index of Articles for Troubleshooting PFE ASIC Syslog Events [juniper.net] ; tag XMCHIPTSG
2019-10-14: Article reviewed for accuracy; no changes required.
Note: KB Team - All changes to this article must be approved by the AI-Scripts Review team ( [email protected] ) before re-publishing.