From: Ronnie Angello (ronnie.angello@gmail.com)
Date: Fri Jan 12 2007 - 22:21:01 ART
Since all VLANs in an MSTP instance share the same STP topology, a topology
change in one VLAN will affect all VLANs within that particular instance.
Ronnie
On 1/12/07, marc fernandez <mag08036@yahoo.com> wrote:
>
> Ronnie,
>
> In PVST+ if you remove a vlan, other vlans
> spanning-tree
> is not affected.
>
> In MST, if you remove one vlan from say instance 2
> (even vlans) will all of the vlans that belong to that
> instance be affected by the change?
>
> In other words will only the single vlan be affected
> or will the whole instance (all vlans part of that
> instance) have to go thru spanning-tree reconvergence?
>
> -marc
>
> --- Ronnie Angello <ronnie.angello@gmail.com> wrote:
>
> > There would be little or no manual configuration
> > necessary because PVST+ is
> > enabled by default (Cisco switches). For basic
> > optimization, root bridge
> > placement and configuration of spanning-tree
> > portfast on access ports would
> > need to be done either way. You wouldn't have to
> > configure separate STP
> > instances and assign vlans to them. PVST+ is less
> > scalable though since
> > your switch will run a separate STP instance for
> > every single VLAN.
> >
> > Once you have configured a significant number of
> > vlans and you have need for
> > optimal configuration with load balancing vlans over
> > trunks, then you should
> > consider MSTP. If load balancing vlans is
> > absolutely necessary for you,
> > even with just a few vlans, this can be done with
> > less configuration via
> > MSTP.
> >
> > Ronnie
> >
> >
> > On 1/12/07, marc fernandez <mag08036@yahoo.com>
> > wrote:
> > >
> > > In a real life scenario. What would be the pros
> > and
> > > cons, advantages or disadvantages in PVST+ vs.
> > MST
> > > if the topology only had a few vlans as apposed to
> > > hundreds of vlans.
> > >
> > > Regards,
> > >
> > > Marc
> > > mag08036@yahoo.com
> > >
> > >
> > >
> > >
> > >
> >
>
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>
>
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This archive was generated by hypermail 2.1.4 : Thu Feb 08 2007 - 23:46:56 ART