[c-nsp] Divide large PVST domain?

[Antonio Soares]

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-protoc
ol/24248-147.html

You just need to be careful because there are two MST flavors running on
cisco switches: pre-standard and standard.



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: terça-feira, 8 de Julho de 2014 10:09
To: cisco-nsp
Subject: [c-nsp] Divide large PVST domain?

Colleagues,

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?

Thanks in advance for any input.


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