This is a simple lab which demonstrates the requirements of bgp external peerings
we have got two routers on 172.16.1.0/24 subnet
R1->172.16.1.1 ,r2->172.16.1.2
R1
Router bgp 1
neighbor 172.16.1.2 remote-as 2
R2
Router bgp 2
neighbor 172.16.1.1 remote-as 1
lets see the routers BGP process and some debug messages
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when we configure peer with wrong AS-number you can see the below output happen
R1
router bgp 1
neighbor 172.16.1.2 remote-as 2
R2
router bgp 2
neighbor 172.16.1.1 remote-as 11-> this should be 1
More to come with E-bgp peering with EBGP-MULTIHOP And other ways of doing things
Regards
Rakesh
