RE: MST Revision number

Hello Garth,

Reading through 802.1q (at
http://standards.ieee.org/getieee802/download/802.1Q-2005.pdf) I find these
statements regarding the revision number:

"choice of Configuration Names and Revision Levels (see below) can be used
to guarantee that the MST Configuration Identifiers will differ if the VID
to spanning tree allocation differs within a single administrative domain"

"Appropriate use of the Configuration Name and Revision Level portions of
the identifier can remove the possibility of an accidental match between MST
Configuration Identifiers that are derived from different configurations
within a single administrative domain"

It appears to be a way to make it less likely that Configuration Identifiers
from different domains will match by coincidence. Of course, if everybody
uses '1' ...

HTH,

Bob Sinclair CCIE 10427 CCSI 30427
CIERS2 Online Instructor
www.tinyurl.com/ciers2online

> -----Original Message-----
> From: nobody_at_groupstudy.com [mailto:nobody_at_groupstudy.com] On Behalf Of
> Garth Bryden
> Sent: Tuesday, September 07, 2010 12:46 AM
> To: Cisco certification
> Subject: MST Revision number
>
> Hello Group,
>
> I'm doing some MST research and I am pretty comfortable with it except
> I
> dont understand the purpose of the MST revision number?
>
> In most configurations I have seen it is just set to "1" and it seems
> to me
> the only purpose it has is to influence the outcome of the md5 hash to
> ensure integrity between all switches within an mstp region?
>
> Is anybody able to explain?
>
> Many thanks.
>
> Garth
>
>
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Received on Tue Sep 07 2010 - 10:00:31 ART