In short, NO. You are correct. I am not looking at the PG right now but it probably meant full mesh inside each subAS.
EBGP between AS is just like regular eBGP...and we know a full mesh cannot possibly be supported between thousands of seperate eBGP domains (the internet...) ------Original Message------ From: Kim Pedersen Sender: [email protected] To: CCIE OSL Subject: [OSL | CCIE_RS] BGP confederations - Full mesh Sent: Jul 18, 2009 9:21 AM Hi All, I am doing some practice scenarios, and came across a question regarding confederation eBGP peers. My assumption is that based on the eBGP nature of confederations, individual "sub-as"'s dont need to be fully meshed. But according to the answer to that question, sub-as's need a full mesh between them, like normal iBGP. I am not talking about within a sub-as, where iBGP rules apply, but simply between these sub-as's. I have done a simple lab with R1, R2 and R3, being in the same "overall AS" 1, and with R4 in AS 777. R1, R2 and R3 is each in their own sub'as. R1 is connected to R2, which is connected to R3. No full mesh. R3 is connected to R4 in regular eBGP style, where it is receiving a route. Assuming i have fixed the next-hop issues regarding confederations not changing next-hop like regular eBGP, i see my route propagated all the way from R4 to R3 to R2 and finally in R1. So to conclude, is a full mesh required between sub-as's when using confederations? Sincerely, Kim Pedersen -- // Freedom Matters // Follow my progress on: http://kpjungle.wordpress.com _______________________________________________ For more information regarding industry leading CCIE Lab training, please visit www.ipexpert.com Regards, Joe Astorino - CCIE #24347 R&S Technical Instructor - IPexpert, Inc. Cell: +1.586.212.6107 Fax: +1.810.454.0130 Mailto: [email protected] _______________________________________________ For more information regarding industry leading CCIE Lab training, please visit www.ipexpert.com
