BGP4 Theory

Borher Getewey brotocol version 4 (BGP-4), the latest version of BGP, is an extension to BGP versions 3 and 2. BGP-4 is currently the routing protocol used to manage routing for the IPv4 Internet. BGP, originally drafted in RFCs 1105, 1163, and 1267, replaced Exterior Gateway Protocol (EGP) as the Internet routing protocol in the early 1990s. This chapter introduces the BGP protocol, explains BGP terminology, and covers BGP protocol operation. The next chapter focuses on BGP configuration.

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