Dear Rene,
Thanks for the information. Yes that is correct.
However, I simulated a similar lab like yours but I have not connected R4 and R5 that you have done, only to see if those router can communicate with R1. And i found out that if i don’t connect R4 and R5 to each other as redundant link then those two router do not need the “bgp confederation peer” and “bgp confederation identifier” commands. Also I found out that those two commands are mandatory for R2 and R3. Since, R2 is connecting External AS router R1 and Internal “sub-as” router R3 and R3 is connecting internal “sub-as” router R2 so these R2 and R3 routers need those commands.
I truly appreciate your help to clear my concept on BGP confederation…
Regards,
--
Ahammad