cisco 1 123.123.55.241
cisco 2 123.123.55.242
node 1 123.123.55.243
node 2 123.123.55.244
node 2 with bgp enabled only on that node
show ip bgp 123.123.55.208
BGP routing table entry for 123.123.55.208/28
Paths: (1 available, best 1, table Default-IP-Routing-Table)
Advertised to non peer-group peers:
123.123.55.241 123.123.55.242 123.123.55.243
Local
0.0.0.0 from 0.0.0.0 (192.168.1.4)
Origin IGP, localpref 100, weight 32768, valid, sourced, local, best
Last update: Mon Oct 15 13:03:04 2012
node 2 after enabling bgp also on node 1
show ip bgp 123.123.55.208
BGP routing table entry for 123.123.55.208/28
Paths: (2 available, best 2, table Default-IP-Routing-Table)
Advertised to non peer-group peers:
123.123.55.241 123.123.55.242 123.123.55.243
Local
123.123.55.243 from 123.123.55.243 (192.168.1.3)
Origin IGP metric 0, localpref 100, valid, internal
Last update: Mon Oct 15 16:48:03 2012
Local
0.0.0.0 from 0.0.0.0 (192.168.1.4)
Origin IGP, localpref 100, weight 32768, valid, sourced, local, best
Last update: Mon Oct 15 13:03:04 2012
and here the output from node 1
show ip bgp 123.123.55.208
BGP routing table entry for 123.123.55.208/28
Paths: (2 available, best 2, table Default-IP-Routing-Table)
Advertised to non peer-group peers:
123.123.55.241 91.241.55.242 91.241.55.244
Local
123.123.55.244 from 91.241.55.244 (192.168.1.4)
Origin IGP metric 0, localpref 100, valid, internal
Last update: Mon Oct 15 16:48:08 2012
Local
0.0.0.0 from 0.0.0.0 (192.168.1.3)
Origin IGP, localpref 100, weight 32768, valid, sourced, local, best
Last update: Mon Oct 15 16:48:02 2012
Both nodes shows the route as best path although the route is in the kernel table from node 1
sh ip route kernel
K 123.123.54.195/32 is directly connected, tmm0
K 123.123.54.196/32 is directly connected, tmm0
K 123.123.54.198/32 is directly connected, tmm0
K 123.123.54.199/32 is directly connected, tmm0
K 123.123.54.200/32 is directly connected, tmm0
K 123.123.54.201/32 is directly connected, tmm0
K 123.123.54.202/32 is directly connected, tmm0
K 123.123.54.203/32 is directly connected, tmm0
K 123.123.54.204/32 is directly connected, tmm0
K 123.123.54.205/32 is directly connected, tmm0
K 123.123.54.207/32 is directly connected, tmm0
K 123.123.54.208/32 is directly connected, tmm0
K 123.123.54.209/32 is directly connected, tmm0 <---- SNAT
K 123.123.54.210/32 is directly connected, tmm0
K 123.123.54.212/32 is directly connected, tmm0
K 123.123.54.213/32 is directly connected, tmm0
K 123.123.55.132/32 is directly connected, tmm0
K 123.123.55.133/32 is directly connected, tmm0
K 123.123.55.135/32 is directly connected, tmm0
K 123.123.55.136/32 is directly connected, tmm0
K 123.123.55.210/32 is directly connected, tmm0
K 123.123.55.211/32 is directly connected, tmm0