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Checking the Status of Spanning-Tree Instance Interfaces

On an MX Series router with a spanning-tree protocol enabled, the detection of a possible bridging loop from spanning-tree protocol operation can raise a bridge protocol data unit (BPDU) error condition on the affected spanning-tree instance interface.

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

  1. To check the status of spanning-tree instance interface, use the show interfaces command.

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

    • If the BPDU Error field is none, the interface is enabled.
    • If the BPDU Error field is Detected and the link is down, the interface is blocked.

Published: 2010-05-11

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