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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)
Intended RFC status (None)
Expired & archived
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Stream WG state WG Document
Document shepherd (None)
IESG IESG state Expired
Consensus boilerplate Unknown
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This Internet-Draft is no longer active.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.)