Spanning tree issue

Unanswered Question
Sep 16th, 2007

Hi all,

-Existing Switch C port 2 is blocked because of High MAC address compared with switch B

-All switch are connected via fast ethernet

-Switch A is root with priority 4096


-Switch B port 2 set spanning tree cost to 500

why switch B port 2 still in forward state and why it will not change to block state ?

I have this problem too.
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glen.grant Sun, 09/16/2007 - 07:34

Not knowing the whole spanning tree structure and cost of your links , spanning tree thinks that where it is currently blocked is the highest cost back to the root so that is where it blocked the loop . It will only block one port in your whole setup and it has done that and eliminated the loop . I won't get into the whole spanning tree thing , best bet is just just go to the main cisco page and search on " configuring spanning tree " .

Francois Tallet Sun, 09/16/2007 - 21:45

Try doing the same cost configuration on switch B port 1;-) The configured cost is only added on the root port.




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