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Routing over a point to point ethernet connection

Here is the scenario. I have 2 data centers miles apart. They are on a Paetec  MPLS. I have a Lightower point to point Ethernet link between the two data centers as well.  At data center A, I have a Paetec managed router (192.168.2.1). The subnets behind that router are 192.168.2.0, 192.168.100.0 and 192.168.101.0. I also have a Cisco 1841 that is configured with fa0 addressed as 192.168.2.250 and fa1 as 10.5.5.1. Fa1 is the one end of the point to point Ethernet link to data center B.

At data center B, I have a Paetec managed router (10.0.2.1). The subnets behind that router are 10.0.2.0, 10.0.100.0 and 10.0.101.0. I also have a Cisco 1841 that is configured with fa0 addressed as 10.0.2.250 and fa1 as 10.5.5.2.

What I want to happen is any traffic headed from data center A destined for 10.0.100.0 or 10.0.101.0 to be routed through the point to point Ethernet link. I had Paetec add routes in their managed router to route any traffic headed for 10.0.100.0 and 10.0.101.0 to my Cisco 1841 (192.168.2.250).

I wanted to do the same for traffic destined for 192.168.100.0 and 192.168.101.0 from data center B. Paetec added the appropriate routes to the router at data center B.

Now, if I trace from data center A to 10.0.100.45, I see this:

1   <1 ms   <1 ms   <1 ms 192.168.2.1

2   <1 ms   <1 ms   <1 ms 192.168.2.250

3     4 ms     4 ms     4 ms 10.5.5.2

4     3 ms     3 ms     3 ms 10.0.2.1

So the routing seems to be ok. However after it hits 10.0.2.1, it gets lost after that.

Am I missing something? Is this a misconfiguration on Paetec’s routers?

I am attaching the configuration for the 1841 in Data Center A

1 REPLY

Re: Routing over a point to point ethernet connection

Looking at your EIGRP config I am thinking that it could be the auto-summary that is causing this issue.

When advertising the 10.0.0.0 network with auto-summary you will have a lot of issues especially if you have other 10.x networks in the other datacentre.

I suggest you do the:

no auto-summary

under the EIGRP.

____________

Please rate reply if answer helps

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