06-15-2008 05:18 AM - edited 03-05-2019 11:38 PM
Hi, still new to the cisco world. can anyone please explain spanning tree that is vlan based and provide and example if possible .. Thanks
06-15-2008 06:17 AM
hello!
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 :
http://www.cisco.com/warp/public/473/147.html
Regards,
Niranjan.
(please rate helpful posts)
06-15-2008 06:57 AM
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
Thanks
06-15-2008 08:45 AM
alternatively, you could also configure PVRST,
if the intention is to create routed VLANs, then yes can terminates ur vlans as sub-ifs.
anotehr way is to create SVI or routed VLANs in switch itself as long is it is supported by IOS and H/W.
HTH
Sam
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