> >Telling people they need a router between them makes people think that
> >VLANs have some magical layer three capabilities which leads to the
> >above question. Do people ever ask if you need a router between your
> >layer 2 broadcast domains? No. Because it used to be obvious. If you
> >want to route, you need a router. VLANs and the similarly misunderstood
> >Layer 3 switch haven't changed that caveat.
> >
>And the question often is, "what problem are you trying to solve by
>routing between VLANs?" There certainly are reasons, in a campus
>environment, to bridge between VLANs with a L2 switch, such as the
>VLAN users in one or more buildings and the servers for that VLAN in
>a separate central computer room.
What are you guys talking about with this bridging between VLANs? Are you
talking about, for example, a Cisco router configured to do bridging? Or
are you talking about doing this, for example, on Cisco switches? If you
have implemented VLANs how do you bridge between them on a switch? Why
don't you just combine them into one VLAN?
Sorry, if I'm being dense. I'm just trying to learn.
Priscilla
> >
> >>> > Can I have multiple subnets on the same VLAN?
> >
> >>Yes, but they won't communicate without a router. A station trying to
> >>communicate with a station in a different subnet ARPs for its default
> >>gateway. Sure there are exceptions with strangely behaving IP stacks
> >and
> >>errors with subnet mask configurations, etc., but let's consider the
> >>typical case.
> >
> >This is my point. To route, you need a router. VLANs haven't changed
> >this whatsoever.
> >
> >I simply find that too many people misunderstand the VLAN concept
> >simply because vendor marketing has confused the issue and numerous
> >pieces of literature make the layer 3 to VLAN binding without properly
> >developing the difference.
> >
> >Nit picky I know, but its a pet peeve.
> >
> >Pete
>
>I personally regard VLANs, first and foremost, as a means of
>multiplexing a LAN.
________________________
Priscilla Oppenheimer
http://www.priscilla.com
Message Posted at:
http://www.groupstudy.com/form/read.php?f=7&i=13902&t=13465
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