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Internetworking Technologies Handbook, Fourth Edition by Cisco Systems, Inc.

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Chapter 41. Border Gateway Protocol

Objectives

  • Understand the purpose of the Border Gateway Protocol.

  • Explain BGP attributes and their use in route selection.

  • Examine the BGP route selection process.

Introduction

The Border Gateway Protocol (BGP) is an interautonomous system routing protocol. An autonomous system is a network or group of networks under a common administration and with common routing policies. BGP is used to exchange routing information for the Internet and is the protocol used between Internet service providers (ISP). Customer networks, such as universities and corporations, usually employ an Interior Gateway Protocol (IGP) such as RIP or OSPF for the exchange of routing information within their networks. Customers connect to ISPs, ...

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