Network Management

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  • 1.  Spanning Tree Root Bridge

    Posted Mar 28, 2022 01:18 PM
    I have two switches configured with MSTP.

    I set EDGE1 as STP priority 15 and the CoreRouter as STP priority 0.

    However I am still receiving errant BPDU's on the Uplink from EDGE1 to the CoreRouter.

    I've attached 3 logs:

    1. STP debug run from the core router
    2. Sanitized Core Router config with STP info
    3. Sanitized Edge Switch config with STP info

    Why does the Edge Switch insist on being the root switch?
    Why am I seeing BPDU's on the uplink from Edge1 to the Core Router?

    ------------------------------
    Aaron Piazza
    ------------------------------

    Attachment(s)

    txt
    STP Debug.txt   1 KB 1 version
    txt
    Core Router.txt   1 KB 1 version
    txt
    Edge1.txt   1 KB 1 version


  • 2.  RE: Spanning Tree Root Bridge
    Best Answer

    Posted Mar 29, 2022 06:20 AM
    Hi,

    Do you have bdpu-protection enabled? Can you share the output of show spanning-tree bpdu-protection?

    ------------------------------
    Ayman Mukaddam
    ------------------------------

    Original Message


  • 3.  RE: Spanning Tree Root Bridge

    Posted Mar 29, 2022 08:52 AM
    Good call.. I did not have BPDU protection enabled, however I did have BPDU-Filter enabled on the Router interface that connects to the Switch.

    ------------------------------
    Aaron Piazza
    ------------------------------

    Original Message


  • 4.  RE: Spanning Tree Root Bridge

    Posted Mar 29, 2022 05:20 PM
    Take a look at this post about errant bpdu received on a port.

    https://community.arubanetworks.com/blogs/esupport1/2020/06/15/aruba-2920-switch-how-is-the-spanning-tree-errant-bpdu-trap-enabled

    ------------------------------
    Luciano Carvalho
    ------------------------------

    Original Message


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