Aggregation Support in the NSFNET Policy-Based Routing Database (RFC1482)
Original Publication Date: 1993-Jun-01
Included in the Prior Art Database: 2019-Feb-10
Internet Society Requests For Comment (RFCs)
M. Knopper: AUTHOR [+1]
This document describes plans for support of route aggregation, as specified in the descriptions of Classless Inter-Domain Routing (CIDR)  and the BGP-4 protocol , by the NSFNET Backbone Network Service. This memo provides information for the Internet community. It does not specify an Internet standard.
Network Working Group Mark Knopper Request for Comments: 1482 Steven J. Richardson Merit/NSFNET 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 unlimited.
This document describes plans for support of route aggregation, as specified in the descriptions of Classless Inter-Domain Routing (CIDR)  and the BGP-4 protocol , 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.
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 Council.
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 [Page 1]
RFC 1482 Routing Aggregation Support July 1993
2. Aggregation Support by the Backbone Service
The NSFNET backbone service includes a Policy-Based Routing Database system which currently holds the set of network numbers that are accepted by the backbone service with a list of Autonomous System numbers from which announcements of these network numbers are expected. In order to implement CIDR, the database system will be modified to allow aggregation of routing information to be configured.
The NSFNET will (initially) not support de-aggregation on its outbound announcements. See section 2.3.
2.1 Current Configuration Capabilities
2.1.1 Inbound Announcements
An example of the way a network number is currently configured is as follows:
35 1:237 2:233 3:183 4:266 5:267 6:1225
This shows that network number 35 (ie. 126.96.36.199, a class A net number) is configured on the T3 backbone such that routing announcements are expect...