AS Path Based Outbound Route Filter for BGP-4
draft-ietf-idr-aspath-orf-13

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IDR                                                             S. Hares
Internet-Draft                                                    Huawei
Intended status: Standards Track                                K. Patel
Expires: June 22, 2017                                             Cisco
                                                       December 19, 2016

             AS Path Based Outbound Route Filter for BGP-4
                    draft-ietf-idr-aspath-orf-13.txt

Abstract

   This document defines a new Outbound Router Filter type for BGP,
   termed "Aspath Outbound Route Filter", that can be used to perform
   aspath based route filtering.  This ORF-type supports aspath based
   route filtering as well as regular expression based matching, for
   address groups.

Status of This Memo

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   This Internet-Draft will expire on June 22, 2017.

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   Copyright (c) 2016 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
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   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  ASpath ORF-Type . . . . . . . . . . . . . . . . . . . . . . .   2
   3.  ASpath ORF encoding . . . . . . . . . . . . . . . . . . . . .   3
   4.  Capability Specification for Cooperative route filtering with
       ASpath  . . . . . . . . . . . . . . . . . . . . . . . . . . .   3
   5.  ASpath ORF Matching . . . . . . . . . . . . . . . . . . . . .   6
   6.  Error handling  . . . . . . . . . . . . . . . . . . . . . . .   6
   7.  Security Considerations . . . . . . . . . . . . . . . . . . .   6
   8.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   6
   9.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   6
   10. Security Considerations . . . . . . . . . . . . . . . . . . .   7
   11. Normative References  . . . . . . . . . . . . . . . . . . . .   7
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   7

1.  Introduction

   The Cooperative Outbound Route Filtering Capability defined in
   [RFC5292] provides a mechanism for a BGP speaker to send to its BGP
   peer a set of Outbound Route Filters (ORFs) that can be used by its
   peer to filter its outbound routing updates to the speaker.

   This documents defines a new ORF-type for BGP, termed "ASpath
   Outbound Route Filter (ASpath ORF)", that can be used to perform AS
   Path based route filtering.  The ASpath ORF supports AS path route
   filtering as well as the regular expression based matching for
   address groups.

2.  ASpath ORF-Type

   The ASpath ORF-Type allows one to express ORFs in terms of regular
   expression and AS path numbers.  That is, it provides AS path based
   route filtering, including regular expression based matching.

   Conceptually an ASpath ORF entry consists of the fields <Sequence,
   Match, Length, Aspath>.

      The "Sequence" field is a number that specifies the relative
      ordering of the entry.

      The "Match" field specifies whether this entry is "PERMIT" (value
      0), or "DENY" (value 1).

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      The "Length" field indicates the length of AS path regular
      expression string.
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