Can't seem to nail this issue down. Have a fairly simple setup
R1 and R2 are Cisco 3550 EMI (L3) switches 12.2.
R3 is Cisco 3660 Enterprise 12.3
R1 is in BGP AS 100
R2 & R3 are in BGP AS 200 adn EIGRP AS 300
R1 & R2 Running BGP
R2 & R3 Running EIGRP
Can ping between all routers (R1>R2, R1>R3, R2>R1, R2>R3in all directions except R3 to R1. It appears that the packets are getting routed properly to R2, but no response is getting back to R3.
I'm pulling my hair out. Nothing fancy in the configs is going on. Any ideas for a cause?