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Cisco Bug: CSCvu41929 - there is link down event in syslog, but no link up event in syslog

Last Modified

Jul 01, 2020

Products (1)

  • Cisco MDS 9000 Series Multilayer Switches

Known Affected Releases

5.2(8h) 6.2(11c)

Description (partial)

Symptom:
MDS 9148S  port-channel 120 members(FC1/45-48)
  kickstart: version 6.2(11c)
  system:    version 6.2(11c)
fc1/45     1      E      on      trunking     swl   TE     8      120      
fc1/46     1      E      on      trunking     swl   TE     8      120      
fc1/47     1      E      on      trunking     swl   TE     8      120      
fc1/48     1      E      on      trunking     swl   TE     8      120      

The customer has a port FC1/48 which is member of  port-channel 120,that shows down in the logging log at 20:10:58 , customer said that when he logged in to MDS at 8:30 pm, he used the show interface brief command to find that the port was up ,but not show up in the logging log
2020 May 26 20:10:58.987 S-HHA4B-PRI-AS23 %PORT-CHANNEL-5-PORT_DOWN: port-channel120: fc1/48 is down <<<<<<<<<<<just show port down this time

052620 211557 819210 (5F2F0)  E_IPS_PM_DIS               IPS_LINK_UP       (0)
052620 201059 092160 (000B)  E_IPS_SYNC_ACQ             IPS_LINK_UP       (0)
052620 201058 986076 (0000)  E_IPS_SIG_LOSS_INTR        IPS_LINK_UP       (0)
052620 201058 986035 (8B6DC5C6)  E_IPS_SYNC_LOSS_INTR       IPS_LINK_UP       (0)

Conditions:
MDS9148s
6.2(11c)
MDS9513
5.2(8h)

fc1/48 @ 9148s went down because of signal loss @ 05/26/20 20:10:58.986076. the signal came back after 104 ms and the port was back online.
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