RFC 1482 (rfc1482) - Page 1 of 11

Aggregation Support in the NSFNET Policy-Based Routing Database

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Network Working Group                                   Mark Knopper
Request for Comments: 1482                      Steven J. Richardson
                                                           June 1993

    Aggregation Support in the NSFNET Policy-Based Routing Database

Status of this memo

   This memo provides information for the Internet community.  It does
   not specify an Internet standard.  Distribution of this memo is


   This document describes plans for support of route aggregation, as
   specified in the descriptions of Classless Inter-Domain Routing
   (CIDR) [1] and the BGP-4 protocol [2], by the NSFNET Backbone Network
   Service.  Mechanisms for exchange of route aggregates between the
   backbone service and regional/midlevel networks are specified.
   Additionally, the memo proposes the implementation of an Aggregate
   Registry which can be used by network service providers to share
   information about the use of aggregation.  Finally, the operational
   impact of incorporating CIDR and aggregation is considered, including
   an analysis of how routing table size will be affected.  This impact
   analysis will be used to modify the deployment plan, if necessary, to
   maximize operational stability.

1. Introduction

   The Internet network service provider community and router vendors
   (as well as the IESG and various IETF working groups) have agreed
   that the time for deployment of route aggregation is upon us. This
   topic has been discussed in the BGP-D, NJM and ORAD working groups at
   several IETF meetings; it was a discussion topic of the NSFNET
   Regional Techs' Meetings in January and June, 1993; and it was also a
   topic of several meetings of the Federal Engineering Planning Group
   and Engineering and Operations Working Group of the Federal Network

   All have generally agreed that Summer, 1993 is the time to enable
   BGP-4 and CIDR aggregation.  Each of the parties is responsible for
   its own aspect of CIDR implementation and practice. This memo
   describes Merit's plans for support of route aggregation on the
   NSFNET, and a proposal for implementing a database of aggregation
   information for use by network providers.

Knopper & Richardson

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