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

I don't follow your argument.
The proposed solution wil NOT change anything in your L3 deplyment,
and everything would be just the same. You would only have a L2
SPAN network. Any other way, AFAIK, will put strain in your switches
because your traffic will be processor switched by them.

Your call, but please explain :)
-Carlos

Saud Malik @ 7/11/2009 5:14 -0300 dixit:
> 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
> <mailto:dale.shaw_at_gmail.com>> wrote:
>
> Hi,
>
> On Sun, Nov 1, 2009 at 10:13 PM, Carlos G Mendioroz
> <tron_at_huapi.ba.ar <mailto: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
>
>

-- 
Carlos G Mendioroz  <tron_at_huapi.ba.ar>  LW7 EQI  Argentina
Blogs and organic groups at http://www.ccie.net