> > >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, Priscilla, lack of precision. I tend to think of a
hierarchical VLAN domain as bridging between, say, the workgroup
switches in a building, the building aggregation switch (and handler
of building-level servers), and the campus core switch(es).
In other words, the VLAN remains one broadcast domain, but has
bridges/switches within it, microsegmenting and aggregating.
>
>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=13908&t=13465
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