BGP usage scenarios

BGP usage scenarios are network configurations that

  • enable ISPs to exchange customer and ISP routes between autonomous systems using External BGP (EBGP),

  • allow service providers to exchange routes within an autonomous system using Interior BGP (IBGP), and

  • support IPv6 prefix routing over IPv6 networks.

BGP implementation contexts

Customer networks, such AS universities and corporations, usually employ an Interior Gateway Protocol (IGP) such AS OSPF for the exchange of routing information within their networks. Customers connect to ISPs, and ISPs use BGP to exchange customer and ISP routes. 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).

BGP can also be used for carrying routing information for IPv6 prefix over IPv6 networks.