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importance of the cost in root switch election

Posted on 2011-02-12
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Medium Priority
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Last Modified: 2012-05-11
I would like to know when the cost of the link comes into consideration in the root switch election.
If I understand the elements of root switch election are:

-priority
-mac address

we can have a tie in priority but never with mac address.
so what  about the cost? is it an element that considered in the root bridge election?

thanks

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Question by:jskfan
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6 Comments
 
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SeeMeShakinMyHead earned 2000 total points
ID: 34878234
link cost does not come into play for what switch is root or secondary, it comes into play on what port is selected as the root port back to the primary.
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Expert Comment

by:SeeMeShakinMyHead
ID: 34878235
not primary, root bridge that is.
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Expert Comment

by:SeeMeShakinMyHead
ID: 34878243
Also, I prefer to set the priorities statically (in increments of 4096 from 0 being root).  I like to control the elections and since an election will never be 0, I can control the root).
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Author Comment

by:jskfan
ID: 34878649
switch A = Root ---

Switch B mac=bbbb-bbbb-bbbb
Switch C mac=cccc-cccc-cccc

priority of B and C is the same.

in this case the link going from C to B is the blocked----if the link cost is all the same.

what if the link cost going from B to C to A is lower than the cost from B to A

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by:SeeMeShakinMyHead
SeeMeShakinMyHead earned 2000 total points
ID: 34878872
Then it would go from B to C to A then.  
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Author Closing Comment

by:jskfan
ID: 34878885
thanks
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