Types of Border Gateway Protocol
- External BGP: It is used to interchange routing information between the routers in different autonomous systems, it is also known as eBGP(External Border Gateway Protocol). The below image shows how eBGP interchange routing information.
eBGP
- Internal BGP: It is used to interchange routing information between the routers in the same autonomous system, it is also known as iBGP(Internal Border Gateway Protocol). Internal routers also ensure consistency among routers for sharing routing information. The below image shows how iBGP interchange routing information.
iBGP
Border Gateway Protocol (BGP)
The protocol can connect any internetwork of the autonomous system using an arbitrary topology. The only requirement is that each AS have at least one router that can run BGP and that is the router connected to at least one other AS’s BGP router. BGP’s main function is to exchange network reachability information with other BGP systems. Border Gateway Protocol constructs an autonomous systems graph based on the information exchanged between BGP routers.
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