I was doing an EIGRP activity and encountered the following problem. I condfigured eigrp on the three routers and when verifying the routing table I realized that routers 1 and 2 have the same routing entries, with parent and child routes, but on router 3 I just found the parent route to network 172.16.0.0 but no child routes (that is, the LANs of the other routers 172.16.2.0. and 172.16.1.0) on the routing table of router 3. Router 3 can indeed ping both routers lan interfaces so there seems to be no connectivity problem, but i was just wondering why the routing table of R3 does not show the lans of router 1 and 2. Any tips?
Did you use a wildcard mask? Did you include the no auto-summary command? Remember, you don't want to summarize to "early" in your plans, because you may also advertise networks that don't exist. I thought I'd answer because I'm studying for my CCNA right now.