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New Member

SH IP EIGRP TOP ALL does not show all expected routes

I have five routers, essentially in a ring, each running EIGRP with the common Class B network (172.19.0.0). Two of them are 7206s and three are 2620s. They are running IOS from 12.0(2)XC2 up to 12.2(1).

I expect the output of a SHOW IP EIGRP TOPOLOGY ALL to show me two routes to each of the networks between routers. Some show two and some show only one. I cannot figure out why. Any ideas what to check next? Am I right that SHOW IP EIGRP TOPOLOGY ALL should show both routes, even non-feasible successors? I do not seem to have a backup route when any one of the connections goes bad, but I want a backup route.

Here is an example from one router. Three of the networks only have one route in the topology table.

P 172.19.191.0/30, 1 successors, FD is 2172416, serno 633

via 172.19.91.2 (2172416/2169856), FastEthernet0/0

P 172.19.219.4/30, 1 successors, FD is 2734080, serno 2

via Connected, Serial0/1

P 172.19.219.0/30, 1 successors, FD is 2698240, serno 642

via 172.19.91.2 (2698240/2695680), FastEthernet0/0

via 172.19.219.5 (3246080/2169856), Serial0/1

P 172.19.110.0/30, 1 successors, FD is 2177536, serno 639

via 172.19.91.2 (2177536/2174976), FastEthernet0/0

via 172.19.219.5 (3251200/2174976), Serial0/1

P 172.19.91.0/24, 1 successors, FD is 28160, serno 1

via Connected, FastEthernet0/0

2 REPLIES

Re: SH IP EIGRP TOP ALL does not show all expected routes

Check whether the feasibility condition for EIGRP is satisfied in case of those 3 networks. I see that costs of the other 3 networks for which, 2 routes are shown, are different in all the 3 cases. So chances are that, for those 3 networks, for which, 2 routes doesnt show up, the feasibility condition is not met.

To find out more on Feasible, Advertised distances, visit,

http://www.cisco.com/warp/public/103/eigrp-toc.html#feasibleandreported

New Member

Re: SH IP EIGRP TOP ALL does not show all expected routes

Thanks for responding. I believe that with the "ALL-LINKS" parameter, the command gives me even links that do not meet the feasibility condition. This is borne out by the output below from one of the other routers. Note, for example, the first network has FD of 2739200, and yet it shows a link with AD of 3248640, which does not meet the feasibility condition. Is there some other condition that must be met for a path to show up in the "topology all" table?

P 172.19.191.0/30, 1 successors, FD is 2739200, serno 2851

via 172.19.110.1 (2739200/2734080), Serial1/0

via 172.19.219.2 (3760640/3248640), Serial2/0:0

P 172.19.219.4/30, 1 successors, FD is 3246080, serno 2332

via 172.19.219.2 (3246080/2734080), Serial2/0:0

via 172.19.110.1 (3253760/3248640), Serial1/0

P 172.19.219.0/30, 1 successors, FD is 2178560, serno 474

via Connected, Serial2/0:0

P 172.19.110.0/30, 1 successors, FD is 62976, serno 2845

via Connected, Serial1/0

P 172.19.91.0/24, 1 successors, FD is 2741760, serno 2863

via 172.19.110.1 (2741760/2736640), Serial1/0

via 172.19.219.2 (3248640/2736640), Serial2/0:0

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