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You are here: Home / Juniper / CHASSISD_FASIC_INPUT_DROP

CHASSISD_FASIC_INPUT_DROP

May 29, 2016 by Marques Brownlee

CHASSISD_FASIC_INPUT_DROP

The Packet Forwarding Engine divides packets into smaller units, known as cells, for more efficient processing. As the indicated F-chip on the indicated Control Board (CB) processed data, which was received from the indicated Packet Forwarding Engine (PFE) on the indicated Flexible PIC Concentrator (FPC), it dropped the indicated number of cells per second.

The isuse related to this syslog message is described in the following sections:

The CHASSISD_FASIC_INPUT_DROP message is logged, when the F-chip is reporting congestion.

When a CHASSISD_FASIC_INPUT_DROP event occurs, a message similar to the following is reported:

CHASSISD_FASIC_INPUT_DROP: Fchip (CB 1, ID 1): dropped 50 cells per second coming from Packet Forwarding Engine 2 on FPC 7
chassisd[4648]: CHASSISD_FASIC_INPUT_DROP: Fchip (CB 2, ID 0): dropped 50 cells per second coming from Packet Forwarding Engine 2 on FPC 2
chassisd[4361]: %DAEMON-3-CHASSISD_FASIC_INPUT_DROP: Fchip (CB 1, ID 1): dropped 51 cells per second coming from Packet Forwarding Engine 0 on FPC 2

The log message may also be seen with the generation of one or more alarms. Possible alarms include the following:

Alarm time Class Description
2009-01-21 15:53:46 CET Minor Check CB 1 Fabric Chip 1
2009-09-01 23:21:22 UTC Minor Check SIB 5 Fabric Chip

Associated log messages are also recorded in the syslog.

The cause for such a notification may be due to either congestion when the cells are dropped inside an F-chip as the available spaces to store the cells being used up or the F-chip hardware being in a state that is not processing the cells as expected.

Examine the following output to help determine the cause of this message (select the log set based on the platform):

All platforms:

show log messages
show chassis alarms
show pfe statistics error

M120:

show chassis fabric map
show chassis fabric summary
show chassis fabric plane
show chassis fabric plane-location

M320:

show chassis fabric fpcs
show chassis fabric sibs
show chassis fabric topology

MX-series:

show chassis fabric fpcs 
show chassis fabric map
show chassis fabric summary
show chassis fabric plane
show chassis fabric plane-location

T-series:

show chassis fabric fpcs 
show chassis fabric sibs
show chassis fabric topology

EX-series:

show chassis fabric fpcs

SRX-series:

show chassis fabric map
show chassis fabric plane-location

The above outputs will show which components are reporting F-chip errors. If a fabric plane has errors on two different Packet Forwarding Engines (PFEs), the issue is probably with the plane; which is the Control Board. If a PFE has errors on two different planes, the issue is probably the PFE; which is the FPC.

On some M-series and T-series platforms, additional information can be directly obtained from the fabric hardware, regarding where the F-chip errors are originating. If the system is referenced below, then collect the related listed output:

(Use only one of the following sets of commands)

start shell pfe network [unit#]
> show syslog messages
> show nvram
T-series:
> show sib fchips all
> show sib smfs_and_fchips all
> show sib stats totals detail all

> exit
Or
request pfe execute command "show syslog messages" target [unit#]
request pfe execute command "show nvram" target [unit#]
T-series:
request pfe execute command "show sib fchips all" target [unit#]
request pfe execute command "show sib smfs_and_fchips all" target [unit#]
request pfe execute command "show sib stats totals detail all" target [unit#]

Replace the above [unit#] entry with the Packet Forwarding Engine component for the router platform:

  • M10/M5: feb
  • M20: ssb#
  • M120: feb#
  • M40e/M160: sfm#
  • T-series: spmb#

The # character will need to be replaced with each installed component number for the router platform (i.e, sfm0, sfm1, sfm2, sfm3).

Perform the following procedure:

1. If the log message occurred only once or is sporadic, then the fabric hardware is performing as designed in handling temporary congestion of traffic.

2. If this issue is time critical or you need an root cause analysis, then open a case with your technical support representative to troubleshoot further. Otherwise the following steps can be used to attempt to resolve the issue.

3. Perform the following procedure during a maintenance window, as it will impact transit traffic:

  • Reset the associated components. Try the Control Board first and then the associated FPC.
  • Swap components on the system; that is, two Control Boards or FPC boards, to see if the issue follows that component.
  • If a known good spare component is available, swap the part to see if this resolves the issue.

4. If the F-chip messages continue at this point, open a case with JTAC for further investigation.

Related

Filed Under: Juniper Tagged With: CHASSISD_FASIC_INPUT_DROP, Control Board, Flexible PIC Concentrator, FPC, Packet Forwarding Engine, PFE

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