[c-nsp] pvst and mst

[Alexander Koch]

On Thu, 17 March 2005 23:24:43 +1000, David J. Hughes wrote:
>  From our experience, dodge MST.  Rapid PVST can happily co-exist with 
> "standard" PVST so your legacy Cisco switches will be well supported.  
> Migration from PVST to RPVST is a much more pleasant experience (and a 
> lot easier to revert if it all goes pear shaped).

David,

thanks for your feedback. What do you do though with some
64-ish and more VLANs in a ring setup, knowing you can only
take some 3 or 4 more VLANs until the max number of instances
for pvst is reached? The 3508 and 2950 are both at 64 (not
counting the 1002-1005 stuff) max, and that number is pretty
close.

Also mst does not work on 3508. Can you say 'argh'? ;-)

Alexander

> On 17/03/2005, at 11:16 PM, Alexander Koch wrote:
> 
> > Hello folks,
> >
> > hopefully someone can clue me in that knows the whole story.
> >
> > We have a mixture of 3508 and 2950 Cisco switches in some
> > sports of our network and the number of VLANs increased a
> > lot lately. Now, the 3508 cannot do MST or rapid-pvst if I
> > am not mistaken. That being said I have basically two Q's:
> >
> > 1. Can psvt and mst co- exist? I get told they can, it has
> > to do with setting all ports (default) to portfast except
> > the trunks, and then mst and pvst can live fine with each
> > other. Obviously we need that thing to work with the 3508.
> >
> > 2. Is there a sane way to switch from pvst to mst, without
> > losing management completely? ,-) It probably is related
> > to the 1st question, yes, but how does one migrate from a
> > to b here the easiest way?