I built 6 routers in a test lab, each one had a L3 /24 connection into a L2 VLAN on a test switch. 2 of the routers provide onward links into our company network/internet and the other 4 will be remote sites only with connections via the 2 main sites.
In the lab it was fine all 6 routers could see the full routing table. Since then I have started to ship the remote routers out to their final locations, the 1st one conencted up OK and can still see the full routing table.
The 2nd one is connected to the network OK, I can reach the internet via one of the main sites and I can connect / ping the router OK.
But it will not connect to the EIGRP process. I have checked and the EIGRP config is exactly the same as the working router, latency back to the main 2 routers is under 30msec.
In 'show ip eigrp events' I do see this message, which none of the other routers show.
i/f delayed net add: 10.x.x.x Vlan10
i/f delayed net add: 10.y.y.y GigabitEthernet0
router eigrp 10
network 10.x.x.0 0.0.15.255
I am using the same summary on all the routers, this worked in the lab and is still working on the other 3 routers that are currently connected.