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Checking for a MAC Rewrite Error Condition Blocking a Spanning-Tree Instance Interface

To check whether a spanning-tree instance interface is blocked due to a MAC rewrite error condition:

  1. Use the show interfaces operational mode command:

    user@host> show interfaces interface-name
  2. You can determine the status of the interface as follows:

    • If the value in the Physical interface includes Enabled, Physical link is Up and the value of the BPDU Error field is None, the interface is enabled
    • If the value in the Physical interface field is Enabled, Physical link is Down and the value in the BPDU Error field is Detected, the interface is blocked.

Published: 2010-05-11

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