RFC 1164 (rfc1164) - Page 2 of 23
Application of the Border Gateway Protocol in the Internet
Alternative Format: Original Text Document
RFC 1164 BGP - Application June 1990
5.1 Overview.............................................. 17
5.2 Methods for Achieving Stable Interactions............. 17
5.2.1 Propagation of BGP Information via the IGP.......... 18
5.2.2 Tagged Interior Gateway Protocol.................... 18
5.2.3 Encapsulation....................................... 19
5.2.4 Other Cases......................................... 19
6. Implementation Recommendations......................... 20
6.1 Multiple Networks Per Message......................... 20
6.2 Preventing Excessive Resource Utilization............. 20
6.3 Processing Messages on a Stream Protocol.............. 21
6.4 Processing Update Messages............................ 21
7. Conclusion............................................. 22
References................................................ 22
Security Considerations................................... 22
Authors' Addresses........................................ 22
1. Acknowledgements
The authors would like to thank Guy Almes (Rice University), Kirk
Lougheed (cisco Systems), Hans-Werner Braun (Merit/NSFNET), Sue Hares
(Merit/NSFNET), and the Interconnectivity Working Group of the
Internet Engineering Task Force (chaired by Guy Almes) for their
contributions to this paper.
2. Introduction
The Border Gateway Protocol (BGP), described in RFC 1163, is an
interdomain routing protocol. The network reachability information
exchanged via BGP provides sufficient information to detect routing
loops and enforce routing decisions based on performance preference
and policy constraints as outlined in RFC 1104 [2].
This memo uses the term "Autonomous System" throughout. The classic
definition of an Autonomous System is a set of routers under a single
technical administration, using an interior gateway protocol and
common metrics to route packets within the AS, and using an exterior
gateway protocol to route packets to other ASs. Since this classic
definition was developed, it has become common for a single AS to use
several interior gateway protocols and sometimes several sets of
metrics within an AS. The use of the term Autonomous System here
stresses the fact that, even when multiple IGPs and metrics are used,
the administration of an AS appears to other ASs to have a single
coherent interior routing plan and presents a consistent picture of
what networks are reachable through it. From the standpoint of
exterior routing, an AS can be viewed as monolithic: reachability to
networks directly connected to the AS must be equivalent from all
border gateways of the AS.
Interconnectivity Working Group