All my 3548s do.....
And the 4000s also do wehn you add teh L3 mod to it.
It's just that the lower end (no L3) don't...
--- "The.Rock" <[EMAIL PROTECTED]> wrote:
> the catalyst 3548's don't either.
>
> ""Rik"" <[EMAIL PROTECTED]> wrote in message
> 99ftpt$p2n$[EMAIL PROTECTED]">news:99ftpt$p2n$[EMAIL PROTECTED]...
> > ISL is Cisco proprietary whereas 802.1Q is an open
> standard. Cisco is
> > moving away from ISL, however. In fact, some of
> the newer equipment no
> > longer supports it, such as the Cat4000 switches.
> >
> > Dot1Q adds less bits to the frame, but the way in
> which it adds them makes
> > it somewhat less efficient. ISL adds several more
> bits to ends of the
> > frame, making it easier to view the trunking info
> bits, but the higher
> > number of bits makes the MTU that much higher as
> well. Dot1Q doesn't have
> > such a pronounced effect on MTU as does ISL.
> >
> > I typically use Dot1Q these days. Knowing that
> Cisco is moving away from
> > ISL and the fact that other vendor's equipment
> supports Dot1Q makes it a
> > more sensible choice for future compatibility.
> >
> > Rik
> >
> >
> > ""Lopez, Robert"" <[EMAIL PROTECTED]> wrote
> in message
> >
>
[EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
> > >
> > > What are the differences between isl and 802.1q
> trunking. If I'm in a
> > total
> > > cisco switched environment, should I always use
> isl? What would be a
> > good
> > > reason to use 802.1q? Which one is more favored
> over the other?
> > >
> > > Robert
> > >
> > >
> > >
> > > Robert M. Lopez
> > > Network Planning
> > > Ann Arbor Data Center
> > > Pfizer Global Research & Development
> > >
> > >
> > >
> > > _________________________________
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> >
> >
> > _________________________________
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> >
>
>
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=====
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