iBGP and eBGP peering can be run on the same router.
When BGP is used between autonomous systems (AS), the protocol is referred to as External BGP (EBGP). If a service provider is using BGP to exchange routes within an AS, then the protocol is referred to as Interior BGP (IBGP).
router bgp 100
neighbor 126.96.36.199 remote-as 100 (this is an iBGP peer, same AS #)
neighbor 188.8.131.52 remote-as 200 (this is an eBGP peer, different AS #)
As for ASBR, this concept is used in OSPF to define a router that bring external routes into the OSPF domain.
router ospf 1
redistribute connected subnets (the redistribute command will automatically classify this router as ASBR).
In an SP context, routers run eBGP to routers in other ASes to receive routes from these other ASes and they also run iBGP between routers in the same AS in order to exchange the external information originally received via eBGP.
The only router that is likely to run only iBGP is the route reflector, which is used to alleviate the need for a full mesh between all BGP routers in an AS.
Hope this helps,
Harold Ritter Sr. Technical Leader CCIE 4168 (R&S, SP) firstname.lastname@example.org México móvil: +52 1 55 8312 4915 Cisco México Paseo de la Reforma 222 Piso 19 Cuauhtémoc, Juárez Ciudad de México, 06600 México
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