New switch addition and STP

Unanswered Question
May 28th, 2008

Hi folks,

if I have 2 switches with only one link between them and no redundancy then add a new switch which has a lower BID than the other 2 switches over a single link do all my ports on all my switches transition into the listening then learning stage?

What would happen if the new switch has a higher BID?



This should be in another forum, I'll close this and move it.

I have this problem too.
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Spanning tree would hold a root bridge election - the switch with the higest ID will win.

if you have configured the switch ports as normal layer 2 - then they will go thru the port spanningtree process.... If you have configured them for portfast - they wont. if you have configured them as a trunk they will not.

How are you actually planning to cable the new switch?


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