spanning tree that is vlan based

Unanswered Question
Jun 15th, 2008

Hi, still new to the cisco world. can anyone please explain spanning tree that is vlan based and provide and example if possible .. Thanks

I have this problem too.
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n.nandrekar Sun, 06/15/2008 - 06:17


Vlan based spanning tree is nothign but PVST ( per vlan spanning tree) - cisco proprietary, or

MSTP (multiple spanning tree protocol) - 802.1s

PVST runns a spanning tree protocol instance for each vlan. Thus for each vlan, there is a set of root bridge, designated, root and blocked ports. Each vlan cvan have a different root bridge/ or different blocked link. A link blocked for 1 vlan can be made active for another vlan allowing, utilizing bandwidth optimally.

MSTP is similar to PVST but instead of running 1 spanning tree instance for each vlan, 1 instance is run for a group of vlans. So there can be multiple groups of vlans and for each group there is 1 instance again allowing utilization of links while maintaining redundancy.

The following links will give you more idea :



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cisco steps Sun, 06/15/2008 - 06:57

Thanks Niranjan.

So if I have one interface going from router to switch I need to creatd subinterfaces for each vlan ? assuming I need to create more then 3 vlans



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