In an EIGRP setup in my study lab, I have routers G, H, and K all connected via TokenRing on subnet 10.3.3.0/24
Router K (a 2513) also has an Ethernet connection, to Router A, on subnet 10.5.5.0/24
Back in the TokenRing setup, G has a 9600bps serial link to Router J (184.108.40.206/24). And finally, J and A have a 9600bps serial link to each other, 220.127.116.11/24). (Each interface address ends with the number equaling its place in the alphabet, i.e A's interfaces' last octets are always .1; J's are always .10, G's are always .7 etc.
A snippet of K's routing table reads:
10.0.0.0/24 is subnetted, 2 subnets
C 10.3.3.0 is directly connected, TokenRing0
C 10.5.5.0 is directly connected, Ethernet0
18.104.22.168/24 is variably subnetted, 3 subnets, 2 masks
D 22.214.171.124/32 [90/2233856] via 10.3.3.7, 00:55:25, TokenRing0
D 126.96.36.199/24 [90/2233856] via 10.3.3.7, 00:55:25, TokenRing0
D 188.8.131.52/32 [90/23310336] via 10.5.5.1, 00:55:31, Ethernet0
184.108.40.206/24 is variably subnetted, 2 subnets, 2 masks
D 220.127.116.11/32 [90/2195456] via 10.5.5.1, 01:00:37, Ethernet0
D 18.104.22.168/24 [90/2195456] via 10.5.5.1, 01:00:37, Ethernet0
A thing I can't figure out is why Router G's serial interface (22.214.171.124/32) is appearing in K's routing table with A as its successor. K is one 4Mbps hop away from G; to get there via A it has to go over the Ethernet link (10Mbps, sure SOUNDS good) but then over a slow serial link to J and then yet another slow serial link to G. I haven't configured any eigrp variance either; so I might expect to see this sort of thing in the eigrp topology table, but surely not the routing table. What am I failing to understand here?