RFC 1164 (rfc1164) - Page 2 of 23

Application of the Border Gateway Protocol in the Internet

Alternative Format: Original Text Document
< Previous
Next >
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
< Previous
Next >