In this case we do not know the AS # for R2 (Backbone). The backbone is configured to neighbor with R1. On R1 configure the neighbor using any AS#
Example on R1:
router bgp 100
neighbor 10.0.0.2 remote-as 300
The following message appears:
R1#
*Apr 23 13:23:41.335: %BGP-3-NOTIFICATION: sent to neighbor 10.0.0.2 passive 2/2 (peer in wrong AS) 2 bytes 0190
Convert the hexadecimal value of 0190 to decimal which equals 400. This is the AS number of the backbone router. Modify the neighbor statement with AS#400
router bgp 100
neighbor 10.0.0.2 remote-as 400
*Apr 23 13:25:47.635: %BGP-5-ADJCHANGE: neighbor 10.0.0.2 Up
R1(config-router)#do sh ip bgp summary
BGP router identifier 10.0.0.1, local AS number 100
BGP table version is 3, main routing table version 3
2 network entries using 240 bytes of memory
3 path entries using 156 bytes of memory
2/2 BGP path/bestpath attribute entries using 248 bytes of memory
1 BGP AS-PATH entries using 24 bytes of memory
0 BGP route-map cache entries using 0 bytes of memory
0 BGP filter-list cache entries using 0 bytes of memory
BGP using 668 total bytes of memory
BGP activity 2/0 prefixes, 3/0 paths, scan interval 60 secs
Neighbor V AS MsgRcvd MsgSent TblVer InQ OutQ Up/Down State/PfxRcd
10.0.0.2 4 400 6 6 3 0 0 00:01:13 2
R1(config-router)#do sh ip bgp
BGP table version is 3, local router ID is 10.0.0.1
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,
r RIB-failure, S Stale
Origin codes: i - IGP, e - EGP, ? - incomplete
Network Next Hop Metric LocPrf Weight Path
* 10.0.0.0/24 10.0.0.2 0 0 400 i
*> 0.0.0.0 0 32768 i
*> 192.168.0.0 10.0.0.2 0 0 400 i
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