Introduction to BGP
Lesson 4: Fundamental BGP Concepts
Border Gateway Protocol (BGP) advertises, learns, and chooses the best paths inside the global Internet. When two ISPs connect, they typically use BGP to exchange routing information. Collectively, the ISPs of the world exchange the Internet’s routing table using BGP. And enterprises sometimes use BGP to exchange routing information with one or more ISPs, allowing the enterprise routers to learn Internet routes.
One key difference when comparing BGP to the usual IGP routing protocols is BGP’s robust best-path algorithm. BGP uses this algorithm to choose the best BGP path (route) using rules ...
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