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Cisco Bug: CSCvi72453 - Down/disabled FC interfaces show random traffic rate along with 'errors/unknown class/too short'

Last Modified

Jun 14, 2018

Products (1)

  • Cisco Unified Computing System

Known Affected Releases

3.2(2b)A

Description (partial)

Symptom:
Down/disabled FC interfaces on the Fabric interconnect are showcasing fluctuating traffic rate along with incrementing 'errors/unknown class/too short' counters.

- We see that the packet rate on the down/disables FC interfaces fluctuates between 0 & 18325193792 bits/sec.
- The same rate is seen on both Rx & Tx at the same time on the interface and this is not expected.
- Furthermore we see there are specific counters like the 'errors', 'unknown class' & 'too short' showcasing huge values.


(nxos)# show int fc 1/5
fc1/5 is down (SFP not present)   <<<<<
    Hardware is Fibre Channel
    Port WWN is 20:05:00:de:fb:1f:4b:80
    Admin port mode is NP, trunk mode is on
    snmp link state traps are enabled
    Port vsan is 1
    Receive data field Size is 2112
    Beacon is turned off
    1 minute input rate 18325193792 bits/sec, 2290649224 bytes/sec, 572662306 frames/sec   <<<<<
    1 minute output rate 18325193792 bits/sec, 2290649224 bytes/sec, 572662306 frames/sec  <<<<<
      273838524794610 frames input, 1052438785966800 bytes
        0 discards, 21904333204500 errors              		<<<<<
        0 CRC,  142395345698430 unknown class              	<<<<<
        0 too long, 21904333204500 too short 				<<<<<

Conditions:
UCSM/NXOS:3.2.2c

(nxos)# show int fc 1/5
fc1/5 is down (SFP not present)

(nxos)# show run int fc 1/5
interface fc1/5
  switchport mode NP
  switchport trunk mode on
  switchport fill-pattern ARBFF speed 8000
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