To answer your original question: Because even though confederation sub-AS peerings are "eBGP" they operate much more like iBGP
1) the AD will be 200 2) the next-hop will not change as it will in a normal eBGP peering 3) certain BGP community values operate differently (no-export) Because the next-hop will not change by default, it is sometimes necessary to do it yourself. On Fri, Apr 9, 2010 at 4:41 PM, Fabio Mendes <[email protected]> wrote: > Could someone clarify a little question about BGP Confederations, please ? > Well, here is the thing: Odom's CCIE R&S Cert Guide v4, page 412, figure > 4-10 and example 10-14 have something I cannot grasp. > If sub-ASes use eBGP rules to inform about updates between themselves, why > should I use the neighbor next-hop-self command, between different sub-ASes > ? > The update flying inside AS 123 without change the NEXT_HOP received by > R1(sub-AS 65001) and R3 (sub-AS 65023). > > Where is the catch ? > > -- > > CCNA - Cisco Certified Network Associate > CCNP - Cisco Certified Network Professional > > "A bird that you set free may be caught again, but a word that escapes your > lips will not return." Jewish Proverb > > _______________________________________________ > For more information regarding industry leading CCIE Lab training, please > visit www.ipexpert.com > > -- Regards, Joe Astorino - CCIE #24347 Sr. Technical Instructor - IPexpert Mailto: [email protected] Telephone: +1.810.326.1444 Live Assistance, Please visit: www.ipexpert.com/chat eFax: +1.810.454.0130 IPexpert is a premier provider of Self-Study Workbooks, Video on Demand, Audio Tools, Online Hardware Rental and Classroom Training for the Cisco CCIE (R&S, Voice, Security & Service Provider) certification(s) with training locations throughout the United States, Europe, South Asia and Australia. Be sure to visit our online communities at www.ipexpert.com/communities and our public website at www.ipexpert.com _______________________________________________ For more information regarding industry leading CCIE Lab training, please visit www.ipexpert.com
