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Topology for two gateways and MPLS in a single LAN

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Last Modified: 2012-05-10
Hi Experts,
We are about to move on to deploy MPLS (with SIP, internet). The MPLS will co-exist with the currently-existing Verizon internet T1 which will be disconnected while the 3 year contract expires next year. I'm very confused about how the two gateways are going to co-exist. Please help me figure if this topology is going to work.
As you can see on the attached file, there will be two gateways -- each from different ISP. Each firewall will be the gateway and handle NAT.
In this case, in order to make the two gateways available to all computers inside the LAN, should I connect Switch-1 and Switch-2? Does it make sense? If not, then how to have pc-A connect to the MPLS?

Stone-MPLS-with-Verizon-T1.JPG
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Yes connect switches and in your Asa add routes to your 2610 for mpls subnets.
Most Valuable Expert 2011

Commented:
With a single-subnet LAN you should have done this below.  It requires creating an additonal Internal LAN Segment (example 10.10.10.x and 10.10.11.x).  The MPLS Router would have the LAN Interface set to run on the second IP Segment.



Simple-Single-Subnet-LAN-with-se.jpg

Author

Commented:
pwindell:
Thank you for the idea. But Cisco1841 has two ports -- port0/1 for SIP & Internet should be connected to Firewall while port 0/0 for MPLS should be to the LAN switch. All traffice to MPLS will be routed to my branch office site . Then what is your Second Internal Segment for?

With your idea, I come out with the following modified diagram. I kind of feel something not very right as the 10.10.10.2 become meaningless. And 10.10.11.x doesn't seem right either. Can you help?
Thanks bunch.
Stone-MPLS-with-Verizon-T1-2.jpg
Most Valuable Expert 2011
Commented:
This one is on us!
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Author

Commented:
It should be PIX515E instead of 2610 in my diagram.
We ended up use two firewalls in this project to keep in only one subnet 10.10.10.0.

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