4500 Tracking Spanning Tree TCN (Topology Change Notifications)

Discussion in 'Cisco' started by Amy L., Jun 3, 2004.

  1. Amy L.

    Amy L. Guest

    I came across this document -

    It mentions that on 4000, 5000, and 6000's are able to show port and
    ID of the bridge that last sent the topology change.

    It says the command is "show spantree statistics" however this is not
    a valid command on a 4500 (IOS).

    Does anyone know what the correct command would be?


    Here is the paragraph I am refering to.

    Tracking the Source of a TCN
    In itself, a topology change is not a bad thing, but as a good network
    administrator, it is better to know where they are coming from in
    order to be sure they are not related to a real problem. Identifying
    the bridge that issued the topology change is not an easy task, though
    not technically very complex.

    Most bridges only count the number of TCNs they have issued or
    received. The Catalyst 4000, 5000, and 6000 are able to show the port
    and the ID of the bridge that sent the last topology change they
    received. Starting from the root, it is then possible to go downstream
    to the initiator bridge. See information on the command for more

    If you have the output of a show spantree statistics command from your
    Cisco device, you can use Output Interpreter to display potential
    issues and fixes. To use Output Interpreter , you must be a registered
    customer, be logged in, and have JavaScript enabled.
    Amy L., Jun 3, 2004
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