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Cisco Bug: CSCvs14641 - SFPs no longer recognized after OIR

Last Modified

Oct 06, 2020

Products (1)

  • Cisco Catalyst 9500H Series Switches

Known Affected Releases


Description (partial)

A C9500 High Performance switch will suddenly stop detecting new SFPs added.

Logs are seen upon insertion-removal but SFP is not see on "show inventory" nor interface goes to err-disabled:

*Nov 15 20:11:42.137: %TRANSCEIVER-6-REMOVED: R0/0: iomd: Transceiver module removed from TwentyFiveGigabitEthernet1/0/2
*Nov 15 20:11:51.151: %TRANSCEIVER-6-INSERTED: R0/0: iomd: transceiver module inserted in TwentyFiveGigabitEthernet1/0/2

------------------ show interfaces status ------------------
Port      Name               Status       Vlan       Duplex  Speed Type
Twe1/0/2                     notconnect   routed       auto   auto unknown

Any SFP already working on the C9500H will start failing after removal-insertion of the SFP.

Working SFPs will not display idprom information on an affected switch. These SFPs will not be detected if removed-reinserted:

------------------ show interfaces status ------------------
Port      Name               Status       Vlan       Duplex  Speed Type
Twe1/0/3  Link to police-fw2 connected    trunk        full   1000 1000BaseLX SFP

C9500H#show idprom int tw1/0/3 de 
%No Transceiver present in Twe1/0/3


On an SFP not being recognized, following errors will appear on IOMD traces after inserting the SFP:

[iomd] [7766]: UUID: 0, ra: 0, TID: 0 (ERR): Verify Checksum failed: sum:e1 checksum:ff
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