I currently have a couple sites that connect to an MPLS that uses BGP. I'm trying to figure out how the MPLS provider is getting my routes from Location 1, 2, and 3 to the other locations. Right now all of my locations have this setup for BGP: So the router bgp 65531 is the same at all of my locations. The remote-as is always the same and the only change is the IP for the neighbor.
router bgp 65531
no synchronization
bgp log-neighbor-changes
redistribute connected
redistribute static
neighbor 10.101.0.50 remote-as 13576
neighbor 10.101.0.50 soft-reconfiguration inbound
no auto-summary
So if Location 1 is 192.168.1.0/24 and location 2 is 192.168.2.0/24 and location 3 is 192.168.3.0/24 how are these routes getting into the tables of the other locations. If I add a subinterface to my router at location 1 of 192.168.100.0/24 it will show up in the routing table at location 2 and 3. So on the router that this all connects to how are thing distributing these networks to my other locations? I've got 3 routers in a lab here setup. 1 of them is acting as the MPLS and the other two are connected via serial links to it. So the MPLS currently has:
router bgp 13576
syncronization
bgp log-neighbor-changes
redistribute connected
neighbor 10.101.0.49 remote-as 65531
neighbor 10.101.0.54 remote-as 65531
So the Location 1 and 2 routers have the same output as I llisted up above here. I for some reason figured the routes from location 1 and 2 would exchange but they are not. They do however exchange and show up on the MPLS router..they just don't quite make it to the location routers?
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OK so it appears the whole as-overide thing is part of the VRF thing. I'm not quite sure on how to configure the VRF. I've made a few attempts but nothing that works. The commands say:
rd 100:1 but they don't explain what 100:1 is? AS:?
then they do:
route target import 100:1 and again what is that?
Is there a better way I could set this up to make it work? Single Serial port with sub-interfaces. Anyway to make this lab distribute routes from one end to another. My end goal is that i'm going to have to redistribute EIGRP into this bgp and this bgp into the eigrp to provide a redundant solution between the two locations.
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by: lrmoorePosted on 2007-09-25 at 15:26:59ID: 19959545
>So the router bgp 65531 is the same at all of my locations.
The ISP is using "as override" and stripping the AS number. I'm not sure how to emulate that in a lab environ. You can try
neighbor 10.101.0.49 as-override
neighbor 10.101.0.54 as-override
reference:
http://www.cisco.com/en/US
Typically I recommend each MPLS remote site have a unique BGP AS number. AT&T will work with you to accomodate. It just makes more sense and gives you more control.
>If I add a subinterface to my router at location 1 of 192.168.100.0/24 it will show up in the routing table at location 2 and 3.
Yes it shoule, because you have redistribute connected
no, because you are in a lab environment and don't have the override feature enabled