Unanswered Question
Feb 14th, 2007

Hi all, is there a rule for how many switches you can have for reach sopanning tree root ?

I have this problem too.
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royalblues Wed, 02/14/2007 - 09:37

There is no hard and fast rule but all the spanning tree parameters are based on a diameter of 7 switches from the root

HTH, rate if it does


carl_townshend Wed, 02/14/2007 - 12:12

what do we do if there are more than 7 bridges here ?, would we use another vlan so this then has another instance of a root ?

You can change the diameter number as part of a CLI command at the root bridge.

Switch(config)# spanning-tree vlan vlan-id root

{primary | secondary} [diameter diameter]

I would however ensure that all spanning-tree timers are adequate for the diameter you configure. (debug)

The out-of-the-box spanning tree timer defaults are based on a tree diameter of less than or equal to 7.

carl_townshend Wed, 02/14/2007 - 16:28

would this be if they were daisy chained twicw together? how about if they all plugged into 1 dist switch ?


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