Here is the current topology in GNS3:There's a tunnel in between R3 & R4 for the iBGP, R3 & R5 are eBGP, R4 and R6 are eBGP. R1-R4 are within the OSPF AS 1190. The BGP works, R3 and R4 can detect the other BGPs shown here:Below is the BGP output for ...