I have successfully set up hundreds of GRE tunnels and run EIGRP. I replaced a 7200 router with a 4500. The EIGRP neighbors will not come up. I can ping from physical interface to physical interface and from tunnel interface to tunnel interface. The only difference is the introduction of the 4500.
Here is a sample of the config.
ip address 10.250.3.78 255.255.255.252
ip summary-address eigrp 100 0.0.0.0 0.0.0.0 200
tunnel source 10.249.0.2
tunnel destination 10.249.2.78
ip route 10.249.0.2 255.255.255.255 10.249.0.1
ip address 10.250.3.77 255.255.255.252
ip summary-address eigrp 100 10.169.0.0 255.255.224.0 5
tunnel source 10.249.2.78
tunnel destination 10.249.0.2
ip route 10.249.2.78 255.255.255.255 10.249.2.77
Let me emphasize that the only difference between all the working configurations (besides IP addresses) is the introduction of the 4500.
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