Another issue to consider is the fact that if IP telephony will ever be
implemented (Cisco's anyway), dot1q trunking has to be used, negating the
use of ISL. A recent implementation has emerged called MISTP (Multiple
Instance STP) that supposedly supports multiple spanning trees over the
dot1q protocol. Does it work in an IP telephony environment? I leave that
up to someone more qualified to answer.
Vijay Ramcharan
----- Original Message -----
From: "Erick B." <[EMAIL PROTECTED]>
To: "Brant I. Stevens" <[EMAIL PROTECTED]>; "Rik"
<[EMAIL PROTECTED]>
Cc: <[EMAIL PROTECTED]>
Sent: Thursday, March 29, 2001 3:28 AM
Subject: Re: trunking
>
> 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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