[c-nsp] Divide large PVST domain?

[Antonio Soares]

Check this article:

http://slaptijack.com/networking/max-spanning-tree-stp-diameter/


Regards,

Antonio Soares, CCIE #18473 (RS/SP)
amsoares at netcabo.pt
http://www.ccie18473.net

-----Original Message-----
From: cisco-nsp [mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of
Victor Sudakov
Sent: Tuesday, July 08, 2014 12:40 PM
To: Antonio Soares
Cc: 'cisco-nsp'
Subject: Re: [c-nsp] Divide large PVST domain?

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
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