Global BPDU guard

Before entering the following command on a switch:

 

spanning-tree portfast bpduguard default

 

I assume you have to manually define you trunk ports otherwise it would see BPDU's coming in on a port connected to a switchport based on the global config assumes all non trunk ports are edge ports? But will it stop the port from going down if dynamic trunks are negotiating?

Comments

  • Best way to find out: Test it! :)

    If you were the one implementing code for this feature, what would you do? Would you assume that configuration is trusted or would you check the actual status of the port? How can you check the status of the port?

  • peetypeety ✭✭✭

    spanning-tree portfast bpduguard default

    I assume you have to manually define you trunk ports otherwise it would see BPDU's coming in on a port connected to a switchport based on the global config assumes all non trunk ports are edge ports? But will it stop the port from going down if dynamic trunks are negotiating?


    What's the second word in the command?  What does that mean to you with regards to this scenario?

    And Daniel has a good point: go lab this up. Your lab is there for your knowledge, and you'll learn through breaking stuff or otherwise putting tools to the test.

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