Cisco Bug: CSCvt36085 - Port-channel member goes error disabled during ISSU but still is sent frames which are discarded
Jun 25, 2020
- Cisco MDS 9000 Series Multilayer Switches
Known Affected Releases
Symptom: Port-channel member not removed from port-channel frame scheduling when it fails during ISSU. When this occurs the port is down but output discards are incrementing on the interface. <pre> fc3/1 is down (Error disabled - bit error rate too high) <<<<<< Port is down Hardware is Fibre Channel, SFP is short wave laser w/o OFC (SN) Port WWN is 20:81:00:2a:6a:65:5a:80 Admin port mode is E, trunk mode is on snmp link state traps are enabled Port vsan is 1 Receive data field Size is 2112 Beacon is turned off Belongs to port-channel214 5 minutes input rate 0 bits/sec,0 bytes/sec, 0 frames/sec 5 minutes output rate 0 bits/sec,0 bytes/sec, 0 frames/sec 7047445326214 frames input,13677158732739772 bytes 1370 discards,2624 errors 1248 invalid CRC/FCS,0 unknown class 0 too long,6 too short 2274764298912 frames output,3998839305943640 bytes 505582 discards,0 errors <<<<<< Output discards increasing 4 input OLS,6 LRR,3 NOS,0 loop inits 12 output OLS,6 LRR, 1 NOS, 0 loop inits Last clearing of "show interface" counters :never </pre> Note: In the reported case, the port that failed during ISSU was in "Error disabled" prior to the ISSU. The ISSU process itself reinitialized the port and brought it up. However, since there was still an underlying physical link issue the port failed quickly do to " bit error rate too high". Reference the following bug for more information on an "Error disabled" port being reinitialized during ISSU: CSCuq78930 Error disabled ports reinitialized after supervisor switchover Conditions: Ongoing ISSU or ISSD.
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