"FD is Infinity" Problem of EIGRP which Stops Advertising Routes

Refer the following scenario where AS 100 and AS 200 are BGP Autonomous Systems and EIGRP is configured on all 3 routers to be in a same EIGRP Autonomous System to advertise everything on every link (using network 0.0.0.0 command for ease of configuration on lab) for underlay routing.

R1 e0/0:192.168.12.1

R2 e0/0:192.168.12.2

R3 e0/0:192.168.13.3

L0 of R1: 1.1.1.1/32

Following are the BGP configuration of routers..

R1(config)#router bgp 100
R1(config-router)#network 1.1.1.1 mask 255.255.255.255
R1(config-router)#neighbor 192.168.12.2 remote-as 200

R2(config)#router bgp 100
R2(config-router)#neighbor 192.168.12.1 remote-as 100

Following are the EIGRP configuration of routers..

R1(config)#router eigrp 100
R1(config-router)#network 0.0.0.0

R2(config)#router eigrp 100
R2(config-router)#network 0.0.0.0

R2(config)#router eigrp 100
R2(config-router)#network 0.0.0.0

Following are the topology tables of the routers..

As you can see, R3 is not learning the 1.1.1.1/32 route from R2 because the FD is Infinity for that route on R2.

Let's examine the topology table entry in R2 for that route to get more info about it..

Looks like there is no Successor for the route. And of course the FD is Infinity, but it shows a composite metric..

To understand why it is showing this problem, let's create a debug and see what happens when the router is going to put it in it's IP routing table..

R2(config)#access-list 1 permit 1.1.1.1 /32
R1#debug ip routing 1

There is the reason, eBGP route has a lower Administrative Distance and the router is going to install it flushing the EIGRP route. Router makes it's EIGRP route to be a route with an Infinite value for it's Feasible Distande (FD) and will stop updating it to it's other neighbors..

If you run debug eigrp fsm (debug for EIGRP Finite State Machine) you will find the actual FD the router make to be this route an infinite..
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