Appendix D. Border Gateway Protocol, Version 4 (BGP4)

This appendix covers the following topics:

  • BGP Multihoming

  • IBGP Versus EBGP

  • Common BGP Implementation

  • BGP Attributes

  • BGP Route Selection

  • BGP Peering

  • BGP Route Reflectors

  • BGP Confederations

  • BGP Administrative Distances

  • BGP Timers

The Border Gateway Protocol (BGP) is used to exchange routing information between Internet Service Provider (ISP) networks, and between ISP networks and customer networks. BGP also can be used as a routing protocol for large-scale enterprise networks. BGP often is the routing protocol used to exchange information between two or more autonomous networks.

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