EIGRP feasible successor

wseyller

Can someone explain why the second link via f0/0 is not a feasible sucessor route. I used an acl to modify the RD of the route coming in from f0/0 to add 500,000. But when I look at the "show ip eigrp topology all-links" it looks to me like the advertised distance of the route through f0/0 is lower than the feasible distance of the successor which I thought should allow it to become a feasible successor.


show ip eigrp topology all-links
P 172.16.0.12/30, 1 successors, FD is 2195456, serno 44
via 172.16.0.2 (2681856/2169856), Serial1/1
via 172.16.0.6 (2695456/2669856), FastEthernet0/0
show ip eigrp topology
P 172.16.0.12/30, 1 successors, FD is 2195456
via 172.16.0.2 (2681856/2169856), Serial1/1

HappyBearIT

My assumption is it has something to do with your FD for the route still showing as 2195456 which is lower than the AD/RD of the route coming in from F0/0. It looks like your ACL modification is only half way working for some reason.

wseyller

I see what you saying about the 2195456. That used to be the feasible distance for the route going out f0/0 before the offset. This is in gns3. May try it on some real equipment to compare.