[c-nsp] Layer Two tunneling question (advice needed)

[Keegan Holley]

Mpls seems a bit much if you're not already running BGP, but l2pvn is an option if your hw supports it. I'm not sure 6500's support security vpns such as l2tp or IPSec.  If run into this limitation in the past. Have you thought about trunking and routing over the same interface.  It's kind of sloppy but it would work.  There are also dwdm/cwdm sfp's that may allow you to create a second logical gig interface on the same fiber.  

Sent from my iPhone

On Jan 3, 2011, at 7:23 PM, John Neiberger <jneiberger at gmail.com> wrote:

> I've never had to configure any sort of layer two tunneling, so I'm
> not really familiar with my options. I'm pretty sure there are many
> here who have done this, so I thought I'd ask. What we need to do is
> fairly simple. Here's a basic map:
> 
> 
> DeviceA ------ [6500] -------(fiber run to different site)--------
> [6500] ------- DeviceB
> 
> At the moment, the devices on each end are connected to layer three
> interfaces, not switchports, and the link between the 6500s is routed.
> We've run into a legacy issue and the solution is to put DeviceA and
> DeviceB on the same vlan. However, we do not want to change the
> routing between the 6500s. We really, *really* want to leave the
> routing in place. Switching to an all layer-two design causes some
> other headaches for us that you don't see because of my simplified
> diagram.
> 
> So, I think some sort of layer two tunneling is in order. What are our
> options if we want to make DeviceA and DeviceB think they're local to
> each other and in the same LAN? I've heard of L2TP and of various MPLS
> techniques that might solve this, but I've just never needed to use
> them and really know nothing about how they're configured or if
> they're even legitimate options.
> 
> Any thoughts?
> 
> Many thanks!
> John
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