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RFC 4271

"A Border Gateway Protocol 4 (BGP-4)", January 2006

Canonical URL:
http://www.rfc-editor.org/rfc/rfc4271.txt
This document is also available in this non-normative format: PDF.
Status:
DRAFT STANDARD
Obsoletes:
RFC 1771
Updated by:
RFC 6286, RFC 6608, RFC 6793
Authors:
Y. Rekhter, Ed.
T. Li, Ed.
S. Hares, Ed.
Stream:
IETF
Source:
idr (rtg)

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Abstract

This document discusses the Border Gateway Protocol (BGP), which is an inter-Autonomous System routing protocol. The primary function of a BGP speaking system is to exchange network reachability information with other BGP systems. This network reachability information includes information on the list of Autonomous Systems (ASes) that reachability information traverses. This information is sufficient for constructing a graph of AS connectivity for this reachability from which routing loops may be pruned, and, at the AS level, some policy decisions may be enforced. BGP-4 provides a set of mechanisms for supporting Classless Inter-Domain Routing (CIDR). These mechanisms include support for advertising a set of destinations as an IP prefix, and eliminating the concept of network "class" within BGP. BGP-4 also introduces mechanisms that allow aggregation of routes, including aggregation of AS paths. This document obsoletes RFC 1771. [STANDARDS-TRACK]


For the definition of Status, see RFC 2026.

For the definition of Stream, see RFC 4844.


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