I would tend to disagree with this. VLANs are not intended to cross routed
boundaries. They evolved as a way to simplify adds/moves/changes on
switched campus networks. I doubt you'd often find it truly necessary that
two users in different cities be in the same VLAN.
VLANs are also, by definition, independent broadcast domains. It would not
make sense from that standpoint to place hosts from different subnets into
the same VLAN. To do so would undermine the security advantages of VLANs
and cause hosts in one subnet to see unnecessary broadcast traffic from
another subnet.
In VLAN-speak, "geographically diverse" usually means that the hosts are in
different physical locations--different floors or buildings--and on
different switches, yet still on the same logical subnet. It would never be
necessary to cross a routed boundary to get from host to host within the
same VLAN.
> Vlans are touted becuase they give the network admin the ability to join
> geographically dispersed hosts. The beauty of Vlans for example, is
being
> able to add hostA from NY with HostB from LA and HostC from Chicago to
the
> same broadcast domain is it not? Based upon this scenario alone it is
very
> likely that a single network would not span that distance using
addressing
> that falls on the same subnet, therefore it is quite likely that a vlan
> could/would consist of hosts from different subnets, and a subnet would
not
> necessarily have its own Vlan...
>
>
>
>
>
>
> >From: John Neiberger <[EMAIL PROTECTED]>
> >Reply-To: John Neiberger <[EMAIL PROTECTED]>
> >To: cablelink <[EMAIL PROTECTED]>
> >CC: [EMAIL PROTECTED]
> >Subject: Re: vlans and subnets
> >Date: Tue, 12 Sep 2000 07:18:32 -0700 (PDT)
> >
> >Yes, sort of. You are correct that a router would be needed to
> >communicate,
> >but your definition of the problem is incorrect. If they are in
different
> >subnets, you should not be placing them in the same VLAN. By
definition, a
> >VLAN is a separate subnet. In a switched environment, each subnet will
> >have
> >its own VLAN and then a router would be used to route between
VLAN/subnets.
> >
> >
> > > Hello everyone, a simple question:
> > >
> > > Assume that you have two PC's that belong to different subnets and
you
> > > connect them to a 2924 and assign them to the same vlan.If the first
PC
> > > pings the second one, because of the fact that they belong to a
> > > different subnet there has to be somewhere a router in order for the
> > > packet to go from one subnet to the other despite of the fact that
they
> > > belong to the same vlan, correct?
> > > Thanks for your time
> > >
> > > alexs
> > >
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