From: Benedict Munyao (bmunyao@gmail.com)
Date: Mon May 21 2007 - 03:08:29 ART
While PVST would achieve the same root bridge selections per VLAN, there
will be a separate STP instance for each VLAN. I believe the scenario tests
you understanding of the use of fewer STP instances, to get the same STP
topologies.
HTH
Benedict Munyao
On 5/20/07, Engin <engin@sekom.com.tr> wrote:
>
> Hi all,
>
> Using below entries I found the same solution.
>
> SW1:spanning-tree vlan 3-7 root primary
> SW2:spanning-tree vlan 13-45 root primary
> SW3:spanning-tree vlan 52-67 root primary
> SW4:spanning-tree vlan 1,1001 root primary
>
> I think these entries per switch decreases the bridge priority from
> default
> of 32768 and for that specific VLANs corresping switches are root.
>
> Why do we need to use MST instances for VLAN ranges and apply mst priority
> for each instance?
>
> Thanks...
>
>
>
> Engin KARTAL
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