[nsp] Bridging VLANs to WAN customers

[Brad Bonin]

A couple of options:

1.  Depending upon the other end of the WAN connection, you could use
L2TPv3 to tunnel your L2 Ethernet traffic.  L2TPv3 is not supported on
routers below 7200.

2.  You can simply use bridgegroups.  I've helped another customer
migrate servers between data centers without changing the IP addresses
by bridging the two VLANs over an ATM connection.  We configured
approximately 10 bridge-groups and had over 15Mbps bridged traffic.  The
router we used was a 7507/RSP4 on one end and a 6509/MSFCII on the other
end.

If you are dealing with just a couple of VLANs and a couple of T-1's, I
don't really see a problem.  Just cut over in stages and pay attention
to your cpu.

brad

-----Original Message-----
From: cisco-nsp-bounces at puck.nether.net
[mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Robert A. Hayden
Sent: Monday, April 28, 2003 9:44 PM
To: cisco-nsp at puck.nether.net
Subject: [nsp] Bridging VLANs to WAN customers


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 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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