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Cisco Bug: CSCvu36162 - Cat9400 SFP port link up take long time and peer interface link up earlier more than 30sec

Last Modified

Jul 27, 2020

Products (1)

  • Cisco Catalyst 9400 Series Switches

Known Affected Releases

16.12.3

Description (partial)

Symptom:
Catalyst9407R with C9400-LC-48S inserting.
when we insert 48 SFPs into C9400-LC-48S, even though almost ports without cabling,
after 9400 reload, we can check SFP port on  C9400-LC-48S link up 2 mins later than SFP inserted logs.
As a result, the peer port up earlier for about 30s~1 mins than 9400 side.

9407 side:
Mar 18 20:31:16.872 JST: %TRANSCEIVER-6-INSERTED: Chassis 2 R0/0: iomd: transceiver module inserted in GigabitEthernet2/1/0/23 
<snip>
Mar 18 16:30:40.003 JST: %TRANSCEIVER-6-INSERTED: Chassis 2 R0/0: iomd: transceiver module inserted in GigabitEthernet2/1/0/48
Mar 18 20:33:07.986 JST: %LINK-3-UPDOWN: Interface GigabitEthernet2/1/0/23, changed state to up 
Mar 18 20:33:08.986 JST: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet2/1/0/23, changed state to up

peer side:
Mar 18 20:32:11.021 JST: %LINK-3-UPDOWN: Interface GigabitEthernet2/0/25, changed state to up 
Mar 18 20:32:12.027 JST: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet2/0/25, changed state to up

Conditions:
many SFP modules are inserted and some port without cable
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