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The Illustrated Network by Walter Goralski

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CHAPTER 15 Border Gateway Protocol

What You Will Learn

In this chapter, you will learn about the BGP and the essential role it plays on the Internet. With BGP, routing information is circulated outside the AS and to all routing domains. We’ll see how a simple routing policy change can make a destination unreachable.

You will learn about the differences between the Internet BGP (IBGP) and the Exterior Gateway Protocol (EBGP), and why both are needed. We’ll also look at BGP attributes and message formats.

The EGP used on the Internet is the Border Gateway Protocol (BGP). IGPs run between the routers inside a routing domain (single AS). BGP runs between different autonomous services (ASs). BGP runs on links between the border routers of these ...

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