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BGP stands for a Border Gateway Protocol. The lastest BGP version is 4. It is referred as BGP-4. BGP-4 is one of the Exterior Gateway Protocols and de-fact standard of Inter Domain routing protocol. BGP-4 is described in RFC1771 - A Border Gateway Protocol 4 (BGP-4).

Many extentions are added to RFC1771. RFC2858 - Multiprotocol Extensions for BGP-4 provide multiprotocol support to BGP-4.