[c-nsp] Divide large PVST domain?

[Victor Sudakov]

Antonio Soares wrote:
> > 
> > I have a train of about 20 C3560X switches connected successively. 
> > I know such a diameter is not good for STP, however, when I place the root
> > bridge in the middle of the train, PVST still works more or less reliably.
> > 
> > However, if I wanted to divide this single STP domain into several smaller
> > ones, which way is best?
> > 
> > I can define three geographical areas between which no loop is physically
> > possible and which cannot have any redundant links between one another.
> > 
> > Should I just configure a bpdufilter on the border switches to separate the
> > areas, or is there a smarter way, maybe going for MST instead of PVST?

> MST is the way to go. It was designed with that in mind. Check this:
> 
> http://www.cisco.com/c/en/us/support/docs/lan-switching/spanning-tree-protocol/24248-147.html

"Cisco recommends that you place as many switches as possible into a
single region; it is not advantageous to segment a network into
separate regions"

I wonder if MST has any limits on the network diameter.


-- 
Victor Sudakov,  VAS4-RIPE, VAS47-RIPN
sip:sudakov at sibptus.tomsk.ru