Cisco Bug: CSCvi72453 - Down/disabled FC interfaces show random traffic rate along with 'errors/unknown class/too short'
Aug 07, 2018
- Cisco Unified Computing System
Known Affected Releases
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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