From: Rich Collins (nilsi2002@gmail.com)
Date: Fri Oct 26 2007 - 21:59:31 ART
Hi Tarun,
Thanks for that link. I had a feeling that it would be backward compatible
with PVST+.
Also it was interesting to see what this P2p Peer(STP) really means:
Access1#show spanning-tree vlan 10
Fa3/0/2 Altn BLK 19 128.108 *P2p Peer(STP)*
*
!--- Type P2p Peer(STP) represents that the neighbor switch runs PVST.
*
I had one other compatibility question: I had a case of a third party
switch supporting RSTP. I didn't have access to it. Would both MST and
rapid-pvst+ be compatible or negotiate a common STP mode?
Thanks
Rich
On 10/26/07, Tarun Pahuja <pahujat@gmail.com> wrote:
>
> Rich,
> The following document would answer all your questions:
>
>
> http://www.cisco.com/en/US/products/hw/switches/ps708/products_configuration_example09186a00807b0670.shtml
>
> Basically, if you try to mix rapid-pvst+ with pvst+ you will not able
> to take full advantage of rapid-pvst+. Majority of PVST+ enhancements
> are already built into rapid-pvst+.
>
> You can run both in the network during the migration phase, but you
> would not able to enjoy faster convergence offered by rapid-pvst+.
>
> HTH,
> Tarun
>
> On 10/25/07, Rich Collins <nilsi2002@gmail.com> wrote:
> > Hi Tarun,
> >
> > I don't have immediate access to any switches so I was wondering as
> Nicky
> > asked whether there are any other caveats with mixing PVST+ and RSTP
> > switches together (other than UplinkFast and BackboneFast)?
> >
> > thanks
> > Rich
> >
> > On 10/24/07, Tarun Pahuja <pahujat@gmail.com> wrote:
> > >
> > > Nicky,
> > >
> > > Rapid-PVST uses the existing configuration for PVST+; however,
> Rapid-PVST
> > > uses RSTP to provide faster convergence. Independent VLANs run their
> own
> > > RSTP instance.
> > >
> > > Dynamic entries are flushed immediately on a per-port basis upon
> receiving
> > a
> > > topology change.
> > > UplinkFast and BackboneFast configurations are ignored in Rapid-PVST
> mode;
> > > both features are included in RSTP.
> > >
> > > HTH,
> > > Tarun Pahuja
> > > CCIE#7707(R&S,Security,SP,Voice,Storage),CCSI
> > >
> > >
> > > On 10/24/07, nicky noname <cisco2study@gmail.com> wrote:
> > > >
> > > > Hello,
> > > > Hello,
> > > >
> > > > I am wondering if people have played much with Rapid PVST+. I plan
> to
> > lab
> > > > it
> > > > up today, but It would be good to hear of possible problems running
> > PVST+
> > > > and rapid PVST+ side by side. I have been reading about it and it
> seems
> > to
> > > > be pretty straight forward. You need to enable the spanning tree
> mode
> > > > globally though right.......you can't just do this for one vlan.
> > > > .......and
> > > > what happens when you want each switch to be backup roots for each
> other
> > (
> > > > one is running in PVST+ and the other in Rapid PVST+)..........can
> you
> > do
> > > > that?
> > > >
> > > > Thanks
> > > >
> > > >
> > _______________________________________________________________________
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> > >
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