Like I said, "fast routing". None of this takes away from the fact that
some device has to perform a layer 3 path determination and a forwarding
decision.
Vendors can play games with where this information is sent and how other
devices can take advantage of that information to forward packets without
having "true" layer 3 capability themselves, but the bottom line is that
there is still a layer 3 device that is the brains behind the operation.
You can call it a router or you can call it a layer 3 switch but its still
fundamentally the same.
My point is that there is not a fundamental difference between what vendors
like to call "layer 3 switching" and routing, its all the same principles,
just applied a little differently. It's the same as comparing a layer 2
switch and a bridge. A layer 2 switch is fundamentally just a multi-port
bridge with asics and port buffers. Sure, there are a lot of features that
switches have that bridges don't, but that doesn't take away from the fact
that they are built and function on the same basic concepts.
Networking is built on simple concepts, there's no reason to make it seem
more complicated than it is. Vendors like to come up with new terms for the
same technologies that have existed for years to make something seem new and
different when its just an evolutionary change, not revolutionary.
-Kent
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of
William V. Wollman
Sent: Friday, July 21, 2000 4:15 PM
To: [EMAIL PROTECTED]
Subject: Re: LAN design
And depending on the network topology you can even skip a few
layer 2 hops and 1 layer 3 hop when compare to traditional
routing.
Tony Olzak wrote:
> But the performance is still much faster than manually routing everything.
> After the first couple of packets, the switch doesn't need to go through
the
> router to reach the other subnet. So, in fact, it is really like layer 3
> switching.
>
> "Kent Hundley" <[EMAIL PROTECTED]> wrote in message
>
news:[EMAIL PROTECTED]
> icrosoft.com...
> > Ron,
> >
> > layer 3 switching = routing
> >
> > "layer 3 switching" is just a marketing term thought up by sales droids
to
> > confuse the masses. At most, layer 3 switching means "fast routing and
> > fowarding". You have asics and software enhancements, but the basic
> > foundation its still a layer 3 path determination and forwarding based
on
> > that information, i.e what we called routing in the old days.
> >
> > Hope that sheds some light.
> >
> > -Kent
> >
> > -----Original Message-----
> > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of
> > Ron Stark
> > Sent: Friday, July 21, 2000 10:06 AM
> > To: [EMAIL PROTECTED]
> > Subject: LAN design
> >
> >
> > Hi people,
> >
> > I have a design question that I was wondering if someone could shed some
> > light
> > on. With all the talk of layer3 switching these days, is it a good idea
to
> > switch at the core? Shouldn't the core be routed?
> >
> > Thanks - Ron
> >
> >
> > ___________________________________
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