BGP or Illustrated Course Guide

BGP

Author: Iljitsch Van Beijnum

Every second, millions of hosts send billions of packets across the Internet to other hosts, with nothing more than the destination IP address to guide them along the way. Internet service providers (ISPs) use the Border Gateway Protocol (BGP) to inform each other which IP address goes where. BGP is also useful for end-user organizations who want reliable connections to the Internet over two or more ISPs.

BGP is the routing protocol that exchanges routing information across the Internet and is the only protocol that can deal with a network of the Internet's size. It's also the only protocol that can deal well with multiple connections to unrelated routing domains. In the event of a network outage, BGP recomputes the path so packets can avoid the problem area and keep flowing.

BGP is a guide to all aspects of BGP: the protocol, its configuration and operation in an Internet environment, and how to troubleshoot it. The book also describes how to secure BGP, and how BGP can be used to combat Distributed Denial of Service (DDoS) attacks. Although the examples throughout this book are for Cisco routers, the techniques discussed can be applied to any BGP-capable router.

Table of Contents:

	Preface
1	The Internet, Routing, and BGP	1
2	IP Addressing and the BGP Protocol	15
3	Physical Design Considerations	36
4	IP Address Space and AS Numbers	61
5	Getting Started with BGP	75
6	Traffic Engineering	95
7	Security and Integrity of the Network	128
8	Day-to-Day Operation of the Network	147
9	When Things Start to Go Down: Troubleshooting	162
10	BGP in Larger Networks	188
11	Providing Transit Services	213
12	Interconnecting with Other Networks	228
A	Cisco Configuration Basics	243
B	Binary Logic, Netmasks, and Prefixes	250
C	Notes on the IPv4 Address Space	256
	Glossary	259
	Index	265

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