Re: OT: Layer 2 over Layer 3 for SPAN (Voice Recording)

Thanks for the feedback guys. But the solution i am looking for should be
over the implemented Layer3 solution that is deployed. Customer doesn't want
to change the Architecture from Layer3. they believe it is Cisco's best
practice while having IPT to reduce convergence time in case of failure of
one of the uplinks to the access switch. it makes sense shifting
Point-to-point interfaces configs to SVI's. but again we have different
Voice Vlan (subnets) for each floor across the campus network.

On Mon, Nov 2, 2009 at 6:57 AM, Dale Shaw <dale.shaw_at_gmail.com> wrote:

> Hi,
>
> On Sun, Nov 1, 2009 at 10:13 PM, Carlos G Mendioroz <tron_at_huapi.ba.ar>
> wrote:
> >
> > Just an idea that popped in my mind: what about keeping L2 just for
> > an RSPAN vlan ?
> > I.e., make your DA (distribution access) links L2 trunks, have your L3
> > traffic into a dedicated vlan (SVIs) and create the RSPAN vlan.
>
> As much as I love "no switchport", I agree that what Carlos is
> proposing is a very feasible solution, and doesn't significantly
> change your logical or physical topology. I've used this before, and
> even retro-fitted it into an existing network, where L2TPv3 etc.
> weren't options due to deployed platforms.
>
> If the requirement wasn't cross-campus, and cabling up some dedicated
> links was cheap/easy, you could create a dedicated L2 network for this
> purpose. It sounds like that wouldn't be the case for you, though.
>
> - Use a dedicated "L3" VLAN ID for every point-to-point link
> - Disable STP for each VLAN used for this purpose
> - Configure switchports as trunks and permit only the (common) RSPAN
> VLAN ID, and the dedicated "L3" VLAN ID
> - Ensure the dedicated "L3" VLAN ID is pruned off all other trunk links
>
> cheers,
> Dale

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Received on Sat Nov 07 2009 - 11:14:38 ART