Sorry, the bgp output stuffs up before, so here's a repost ;) Hey all, I'm probably missing some fairly simple concept here. I have setup 4 routers as follows:-
RTB / RTD --- RTA \ RTC Both RTB & RTC are connected (via Eth) to a network called 172.17.1.0 /24. RTA & RTD are both in AS2 RTB & RTC are both in AS1 The connection between RTA & RTD is via Ethernet RouterA#sh ip bgp BGP table version is 9, local router ID is 25.25.25.2 Status codes: s suppressed, d damped, h history, * valid, > best,i -internal Origin codes: i - IGP, e - EGP, ? - incomplete Network Next Hop Metric LocPrf Weight Path *> 10.1.1.0/30 10.1.1.2 0 0 1 i * 10.1.2.2 0 1 i *> 10.1.2.0/30 10.1.1.2 0 1 i * 10.1.2.2 0 0 1 i *> 25.25.25.0/24 0.0.0.0 0 32768 i *> 172.17.1.0/24 10.1.1.2 0 0 1 i * 10.1.2.2 0 0 1 i RouterA#sh running-config router bgp 2 network 25.25.25.0 mask 255.255.255.0 neighbor 10.1.1.2 remote-as 1 neighbor 10.1.2.2 remote-as 1 neighbor 25.25.25.1 remote-as 2 maximum-paths 6 When I lookup RTD's BGP table (shown below), for the route 172.17.1.0/24, instead of via 10.1.1.2 or 10.1.2.2, it is 25.25.25.2. Ok - here's what I'm confused about. Since I thought that in EBGP peering, the next hop is usually the IP address of the neighbor that announced the route, but IBGP peering preserve the Next-hop attribute learned from EBGP peers. So in the case, if I haven't use next-hop-self on RTA, I would think the EBGP next hop in RTD's BGP table would be either 10.1.1.2 or 10.1.2.2, but why is the EBGP next-hop is 25.25.25.2? RouterD#sh ip bgp BGP table version is 6, local router ID is 172.16.0.2 Status codes: s suppressed, d damped, h history, * valid, > best,i -internal Origin codes: i - IGP, e - EGP, ? - incomplete Network Next Hop Metric LocPrf Weight Path *>i10.1.1.0/30 25.25.25.2 0 100 0 1 i*>i10.1.2.0/30 25.25.25.2 100 0 1 i*>i25.25.25.0/24 25.25.25.2 0 100 0 1 i *>i172.17.1.0/24 25.25.25.2 0 100 0 1 i Thanks, H. Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=47219&t=47219 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]