802.1q doesn't support multiple spanning trees, but
many vendors have added their own support which may or
may not interoperate well with other vendors. YMMV.
802.1s will which is at draft 9 (march 9 2001). To my
knowledge, I don't know of any vendors with support
for it at this time in it's draft form nor do I know
how different it is from PVST, etc.
--- "Brant I. Stevens" <[EMAIL PROTECTED]>
wrote:
> This may seem like nit-picking, but it isn't
> actually a revision of
> 802.1Q that supports
> PVST, but rather, the vendor gear that supports PVST
> with the use of
> 802.1Q... Nortel
> Passport (Accelar) switches support this as well...
>
> -Brant
>
> Rik wrote:
>
> > Actually, most newer revisions of Dot1Q support
> PVST as well.
> >
> > Rik
> >
> > ""ciscosis"" <[EMAIL PROTECTED]> wrote in
> message
> > 001301c0b3b7$aba8b000$593d839b@nes2s50667">news:001301c0b3b7$aba8b000$593d839b@nes2s50667...
> > > ISL has a number of advantages over dot1q, for
> example it supports per
> > vlan
> > > spanning tree (PVST) which allows a separate
> spantree instance per Vlan
> > > which makes networks more scalable and more
> stable than dot1q based.
> > >
> > > It is Cisco proprietary but it interoperates
> with dot1q (common spanning
> > > tree) compliant switches (using Cisco protocol
> PVST+)
> > >
> > > If you are building a large cisco switched
> network with alot of Vlans and
> > > are worried about issues such as spanning tree
> convergence/ stability
> > > /reliability .. definately go for ISL
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