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Catalyst 6500/6000 standby supervisor engine module is not online, or status indicates Unknown


Core issue

If the standby supervisor engine module is not coming online (indicated by the status of other or faulty in the output of the show module command, or indicated by amber status LED), it may be due to one of the common reasons indicated in this document.


To resolve this problem, perform these steps:

  1. Console into the standby supervisor engine to determine whether it is in ROM Monitor (ROMmon) or in continuous reboot.

    As an example, this output shows the supervisor engine in slot2 in ROMmon mode.

    tpa_data_6513_01#show module

    Mod Ports Card Type                              Model              Serial No.

    --- ----- -------------------------------------- ------------------ -----------

      1    2  Catalyst 6000 supervisor 2 (Active)    WS-X6K-S2U-MSFC2   SAD0628035C

      2    0  Supervisor-Other                       WS-X6K-S2U-MSFC2   Unknown

      3   16  Pure SFM-mode 16 port 1000mb GBIC      WS-X6816-GBIC      SAL061218K3

      4   16  Pure SFM-mode 16 port 1000mb GBIC      WS-X6816-GBIC      SAL061218K8

      5    0  Switching Fabric Module-136 (Active)   WS-X6500-SFM2      SAD061701YC

      6    1  1 port 10-Gigabit Ethernet Module      WS-X6502-10GE      SAD062003CM

    Mod MAC addresses                       Hw    Fw           Sw           Status

    --- ---------------------------------- ------ ------------ ------------ -------

      1  0001.6416.0342 to 0001.6416.0343   3.9   6.1(3)       7.5(0.6)HUB9 Ok     

      2  0000.0000.0000 to 0000.0000.0000   0.0   Unknown      Unknown      Faulty

      3  0005.7485.9518 to 0005.7485.9527   1.3   12.1(5r)E1   12.1(13)E3,  Ok     

      4  0005.7485.9548 to 0005.7485.9557   1.3   12.1(5r)E1   12.1(13)E3,  Ok     

      5  0001.0002.0003 to 0001.0002.0003   1.2   6.1(3)       7.5(0.6)HUB9 Ok     

      6  0002.7ec2.95f2 to 0002.7ec2.95f2   1.0   6.3(1)       7.5(0.6)HUB9 Ok     

    Mod Sub-Module                  Model           Serial           Hw     Status

    --- --------------------------- --------------- --------------- ------- -------

      1 Policy Feature Card 2       WS-F6K-PFC2     SAD062802AV      3.2    Ok    

      1 Cat6k MSFC 2 daughterboard  WS-F6K-MSFC2    SAD062803TX      2.5    Ok    

      3 Distributed Forwarding Card WS-F6K-DFC      SAL06121A19      2.1    Ok    

      4 Distributed Forwarding Card WS-F6K-DFC      SAL06121A46      2.1    Ok    

      6 Distributed Forwarding Card WS-F6K-DFC      SAL06261R0A      2.3    Ok    

      6 10GBASE-LR Serial 1310nm lo WS-G6488        SAD062201BN      1.1    Ok

    If so, console into the standby supervisor engine to recover from this situation. For recovery procedures, refer to Recovering a Catalyst 6500/6000 Running Cisco IOS System Software from a Corrupted or Missing Boot Loader Image or ROMmon Mode.

  2. Make sure that both supervisor engines are running the same Cisco IOS  Software level.

    Check whether the active and standby supervisor engines are running the same Cisco IOS Software release. If not, it is possible that the standby supervisor may not come online. For example, if the active supervisor engine is running RPR+ mode (available since Cisco IOS Software Release 12.1[11]EX) and the standby supervisor engine is running a version prior to RPR/RPR+ mode (such as Cisco IOS Software Release 12.1[8b]E9), the second supervisor engine fails to come online, as the redundancy mode is EHSA (by default). The standby supervisor engine would fail to negotiate with the active supervisor engine.

  3. Make sure the supervisor engine module is properly seated in the backplane connector.

    Make sure that the supervisor engine's installation screw is completely tightened.

    For more information, refer to the Catalyst 6500 series switch module installation note.

  4. Determine whether the standby supervisor engine is faulty.

    To do so, issue the redundancy reload peer command from the active supervisor engine. Through the console to the standby supervisor engine, observe the boot up sequence to identify any hardware failures.

  5. If the standby supervisor engine still does not come online, run this Generic Online Diagnostics (GOLD) test.

    Issue the diagnostic start module test complete command to retest the module in the runtime environment and to observe if the module still shows failure status. If so, capture the log from the above troubleshooting steps and create a service request with Cisco Technical Support.

    For more information on using the online diagnostic testing command line interface, refer to article How to run GOLD diagnostic tests on Catalyst 6500/6000 series switches to troubleshoot hardware issues.


Problem Type

Supervisor issues

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