BGP Design and Implementation by Randy Zhang

By Randy Zhang

In case you wanna be a grasp in BGP expertise, this ebook could be a needs to. It explains in designated the BGP know-how and provides a complicated point.

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Wherever appropriate, updated information is provided. Specifically, this chapter tries to achieve the following objectives: • Provide an overview of Cisco’s implementation of BGP, such as BGP processes in IOS. A case study on how to estimate BGP memory use in Cisco routers is presented near the end of this chapter. • Review fundamental BGP components, such as BGP attributes, the BGP decision process, BGP capabilities exchange, the Routing Information Base (RIB), and so on. • Discuss some of the basic BGP concepts, such as iBGP and BGP and IGP routing exchange.

Because fully meshed networks tend to limit scalability because of the number of sessions that must be maintained on each router and the number of updates that must be generated, route reflection and confederation are two methods that increase the scalability of BGP networks. Detailed discussions of these methods are included in Chapter 7, “Scalable iBGP Design and Implementation Guidelines,” Chapter 8, “Route Reflection and Confederation Migration Strategies,” and Chapter 10. Aggregation of routes is another tool that BGP uses to reduce the number of prefixes to be advertised and increase stability.

Provides information about how to traverse a given AS or reach a given location. Provides information about what is available at a location, without indicating how to reach it. After you examine the differences between iBGP and IGPs, it is also important to understand the fundamental differences between iBGP and eBGP (see Table 2-2). book Page 24 Wednesday, November 12, 2003 5:19 PM 24 Chapter 2: Understanding BGP Building Blocks Table 2-2 Comparison of iBGP and eBGP iBGP eBGP Peering inside an AS must consist of a full mesh, because an iBGP speaker is not allowed to pass on prefixes learned from one iBGP peer to another iBGP peer.

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