[c-nsp] Quick spanning-tree and bridge-group question

Sam Stickland sam_mailinglists at spacething.org
Fri Jul 4 14:06:23 EDT 2008


Peter Rathlev wrote:
>
> Isn't port priority the last thing the Spanning Tree Algorithm looks at?
> AFAIK the selection of root port should be, in order: Root Bridge ID,
> Port Path Cost, Sending Bridge ID and at last Sending Port ID, which is
> Port Priority and Port Index.
>
> Are the three ports all pointing towards the root bridge?
>   
Yes, all three ports are pointing towards the root.  You are right, I 
had remembered the order wrong. At least something like this causes it 
to sink it. (I would test it but I'm having trouble convincing one of 
the other routers to change it's bridge identifier on the BVI :| )

Sam


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