EIGRP to BGP to EIGRP – Configuration Guide

bgpeigrpredistributionroutingvpn

I would like to ask if it is possible to implement eigrp routing sent through bgp?
enter image description here

I wanted to route from PC-1 to PC-2 using EIGRP. The connection between all of the three routers are through BGP protocol. PC-3 should not receive any routing to PC-1 and PC-2. T

The problem is now I can ping from PC-1 to RTR-3, however there is no route to PC-2. All of the redistribution route I found from internet is only from EIGRP to BGP. So is it possible from EIGRP to BGP to EIGRP back?

RTR-1

router bgp 10000
network 1.1.1.0 mask 255.255.255.252
neighbor 1.1.1.1 remote-as 10001

router eigrp 100
network 192.168.1.0 0.0.0.255
redistribute bgp 10000

RTR-2

router bgp 10001
network 1.1.1.0 mask 255.255.255.252
network 2.2.2.0 mask 255.255.255.252
network 192.168.3.0 mask 255.255.255.0
neighbor 1.1.1.2 remote-as 10000
neighbor 2.2.2.2 remote-as 10000

RTR-3

router bgp 10000
network 2.2.2.0 mask 255.255.255.252
neighbor 2.2.2.1 remote-as 10001

router eigrp 100
network 192.168.2.0 0.0.0.255
redistribute bgp 10000

Edit:

Is it feasible if I were also to use DMVPN/Site to Site tunnel network and advertise to IGP?

Best Answer

I think you are misunderstanding a fundamental concept of routing protocols. Routing protocols do not route packets. They exchange routing information (reachability) with other routers. You run a routing protocol on two or more routers so they can exchange routing information. If you only have one router, you don't need a rotuing protocol, because there is no one for that router to exchange information with.

So in your network, routers 1,2, and 3 exchange information via the BGP protocol -- they learn each other's networks. Router 1 and 3 do not talk directly with each other, so there is no point in running EIGRP on them -- it does absolutely nothing except waste CPU cycles.

On Router 1 and 2, add a network statement under the BGP configuration for the connected network:

network 192.168.x.0 mask 255.255.255.0

If you want Routers 1 and 3 to exchange information directly without getting Router 2 involved (for example, if router 2 was an ISP), then you can configure a tunnel between them (GRE, DMVPN, etc) so they can talk directly with each other as if Router 2 doesn't exist.

Related Topic