[nsp] Bridging VLANs to WAN customers

[Stephen J. Wilcox]

On Mon, 28 Apr 2003, Robert A. Hayden wrote:

> I wanted to get some thoughts here.
> 
> We're currently rebuilding our legacy ATM network into a new ethernet/VLAN
> based network.  It's a slow process with 200 buildings to migrate over.
> However, it's purring along pretty well in general.
> 
> We also have about 30-40 WAN customers that we are currently serving with
> ATM links over T1 and T3 connections.  Given the immense desire to "do
> away"  with all of the ATM, I'm wondering what the current thinking is on
> how to extend Layer2 connectivity down to the other end of a T1
> connection.  Most of these connections will need at least 4 to 6 VLANs
> trunked down to them.
> 
> My first instinct, and I'm pretty sure this is NOT a good idea, was to use
> a 7200 of some kind to terminate the T1s and then build GRE tunnels over
> the T1 and put each tunnel into a bridge group along with the appropriate
> VLAN. -----  As I said, most likely NOT a good idea.

The trouble with the tunnels is they are cpu based, and use lots of it, you can 
only get a few Mbs before you start maxing out the box..

Steve

> The other thought would be some kind of an MPLS-based approach, but none
> of our core gear (6500s) are MPLS capable without the Sup720s and the
> edge equipment would have to be forklifted.
> 
> Any thoughts here?
> 
> - Robert
> 
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