Autonomous System Path Expression Extension to Ripe-181

Document Type Expired Internet-Draft (rps WG)
Authors Jessica Yu  , Cengiz Alaettinoglu 
Last updated 1995-11-21
Stream Internet Engineering Task Force (IETF)
Expired & archived
pdf htmlized bibtex
Stream WG state WG Document
Document shepherd No shepherd assigned
IESG IESG state Expired
Consensus Boilerplate Unknown
Telechat date
Responsible AD (None)
Send notices to (None)

This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


Ripe-181 [Bates et al., 1994] is a language to specify routing policy constraints for inter-domain routing in the Internet. Ripe-181 allows the specification of both import policy constraints (by specifying as-in and interas-in attributes) and export policy constraints (by specifying as-out and interas-out attributes). There are limitations in the types of preference and access control policies that can be described by RIPE-181 and the limitations became evident when several enterprises tried to use RIPE-181 to describe their routing policies. One such limitation is the lack of ability to specify autonomous-system path expressions, henceforth referred to as AS path expressions, in the policy attributes (i.e. as-in, interas-in, as-out and interas-out attributes). This document extends Ripe-181 to enable the specification of AS path expressions in the aut-num objects. It is assumed that the reader is familiar with Ripe-181.


Jessica Yu (
Cengiz Alaettinoglu (

(Note: The e-mail addresses provided for the authors of this Internet-Draft may no longer be valid.)