From router1: sh ip bgp 62.36.0.0 BGP routing table entry for 62.36.0.0/19, version 9184414 Paths: (4 available, best #1, table Default-IP-Routing-Table) Advertised to update-groups: 2 16338 16338 12479, (aggregated by 12479 62.36.192.55), (received & used) 62.100.100.229 from 62.100.100.229 (62.81.121.136) Origin IGP, metric 4294967294, localpref 100, valid, external, atomic-aggregate, best Community: 1070727170 42612 174 12479, (aggregated by 12479 62.36.192.55), (received & used) 10.1.1.253 (metric 2) from 10.1.1.253 (10.1.1.253) Origin IGP, metric 0, localpref 100, valid, internal, atomic-aggregate 42612 6453 5511 12479, (aggregated by 12479 62.36.192.55) 195.219.117.13 from 195.219.117.13 (66.110.0.80) Origin IGP, localpref 100, valid, external, atomic-aggregate 6453 5511 12479, (aggregated by 12479 62.36.192.55), (received-only) 195.219.117.13 from 195.219.117.13 (66.110.0.80) Origin IGP, localpref 100, valid, external, atomic-aggregate From router 2 sh ip bgp 62.36.0.0 BGP routing table entry for 62.36.0.0/19, version 11636907 Paths: (3 available, best #2, table Default-IP-Routing-Table) Advertised to update-groups: 2 16338 16338 12479, (aggregated by 12479 62.36.192.55), (received & used) 10.1.1.249 (metric 2) from 10.1.1.249 (10.1.1.249) Origin IGP, metric 4294967294, localpref 100, valid, internal, atomic-aggregate 42612 174 12479, (aggregated by 12479 62.36.192.55) 149.6.150.69 from 149.6.150.69 (38.28.4.32) Origin IGP, metric 0, localpref 100, valid, external, atomic-aggregate, best Community: 11424364 11425271 174 12479, (aggregated by 12479 62.36.192.55), (received-only) 149.6.150.69 from 149.6.150.69 (38.28.4.32) Origin IGP, metric 0, localpref 100, valid, external, atomic-aggregate Community: 11424364 11425271 You can see as router 1 has a best route to 62.36.0.0 through 16338 (42612 is our own AS) and router2 through 174. So a packet entering an interface in router1 will exit to 62.36.0.0 through it, and if it enters router2, it exits through it. Both routers have an equal best route, so both have it implemented. That is what I meant in the other post. BUT: from router 1 sh ip bgp 212.172.0.0 BGP routing table entry for 212.172.0.0/16, version 9184131 Paths: (3 available, best #2, table Default-IP-Routing-Table) Advertised to update-groups: 2 16338 16338 1273 3257 12312, (received & used) 62.100.100.229 from 62.100.100.229 (62.81.121.136) Origin IGP, metric 4294967294, localpref 100, valid, external Community: 83449328 83449525 213454752 213454753 213455801 1070727171 42612 6453 3257 12312 195.219.117.13 from 195.219.117.13 (66.110.0.80) Origin IGP, localpref 100, valid, external, best 6453 3257 12312, (received-only) 195.219.117.13 from 195.219.117.13 (66.110.0.80) Origin IGP, localpref 100, valid, external and from router 2: sh ip bgp 212.172.0.0 BGP routing table entry for 212.172.0.0/16, version 12108320 Paths: (3 available, best #1, table Default-IP-Routing-Table) Not advertised to any peer 42612 6453 3257 12312, (received & used) 10.1.1.249 (metric 2) from 10.1.1.249 (10.1.1.249) Origin IGP, metric 0, localpref 100, valid, internal, best 42612 174 3257 12312 149.6.150.69 from 149.6.150.69 (38.28.4.32) Origin IGP, metric 21001, localpref 100, valid, external Community: 11424364 11425276 174 3257 12312, (received-only) 149.6.150.69 from 149.6.150.69 (38.28.4.32) Origin IGP, metric 21001, localpref 100, valid, external Community: 11424364 11425276 You can see as in this case the best route is unique, through 6453, router 1, and this is the one passed to router2, and elected as best. No one of the routes from router 2 are passed to router 1, I suppose because they are worse than the best from this one. My concerns were with this case, cause I didn't see the routes from router 2 in router 1, as I saw in the first case.