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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