Revised Validation Procedure for BGP Flow Specifications
draft-ietf-idr-bgp-flowspec-oid-10

Document Type Active Internet-Draft (idr WG)
Last updated 2019-08-09
Replaces draft-djsmith-bgp-flowspec-oid
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Network Working Group                                          J. Uttaro
Internet-Draft                                                      AT&T
Updates: 5575bis (if approved)                                J. Alcaide
Intended status: Standards Track                             C. Filsfils
Expires: February 9, 2020                                       D. Smith
                                                                   Cisco
                                                            P. Mohapatra
                                                        Sproute Networks
                                                          August 8, 2019

        Revised Validation Procedure for BGP Flow Specifications
                   draft-ietf-idr-bgp-flowspec-oid-10

Abstract

   This document describes a modification to the validation procedure
   defined in [RFC5575bis] for the dissemination of BGP Flow
   Specifications.  [RFC5575bis] requires that the originator of the
   Flow Specification matches the originator of the best-match unicast
   route for the destination prefix embedded in the Flow Specification.
   This allows only BGP speakers within the data forwarding path (such
   as autonomous system border routers) to originate BGP Flow
   Specifications.  Though it is possible to disseminate such Flow
   Specifications directly from border routers, it may be operationally
   cumbersome in an autonomous system with a large number of border
   routers having complex BGP policies.  The modification proposed
   herein enables Flow Specifications to be originated from a
   centralized BGP route controller.

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
   Task Force (IETF).  Note that other groups may also distribute
   working documents as Internet-Drafts.  The list of current Internet-
   Drafts is at https://datatracker.ietf.org/drafts/current/.

   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at any
   time.  It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on February 9, 2020.

Uttaro, et al.          Expires February 9, 2020                [Page 1]
Internet-Draft    Revised Flowspec Validation Procedure      August 2019

Copyright Notice

   Copyright (c) 2019 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
   Provisions Relating to IETF Documents
   (https://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
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   described in the Simplified BSD License.

Table of Contents

   1.  Requirements Language . . . . . . . . . . . . . . . . . . . .   2
   2.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   3.  Motivation  . . . . . . . . . . . . . . . . . . . . . . . . .   3
   4.  Revised Validation Procedure  . . . . . . . . . . . . . . . .   5
     4.1.  Revision of Route Feasibility . . . . . . . . . . . . . .   5
     4.2.  Revision of AS_PATH Validation  . . . . . . . . . . . . .   6
   5.  Other RFC5575bis Considerations . . . . . . . . . . . . . . .   7
   6.  Topology Considerations . . . . . . . . . . . . . . . . . . .   8
   7.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   9
   8.  Security Considerations . . . . . . . . . . . . . . . . . . .   9
   9.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  10
   10. Normative References  . . . . . . . . . . . . . . . . . . . .  10
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  11

1.  Requirements Language

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
   document are to be interpreted as described in RFC 2119 [RFC2119].

2.  Introduction

   [RFC5575bis] defined a new BGP [RFC4271] capability that can be used
   to distribute traffic Flow Specifications amongst BGP speakers in
   support of traffic filtering.  The primary intention of [RFC5575bis]
   is to enable downstream autonomous systems to signal traffic
   filtering policies to upstream autonomous systems.  In this way,
   traffic is filtered closer to the source and the upstream autonomous
   system(s) avoid carrying the traffic to the downstream autonomous
   system only to be discarded.  [RFC5575bis] also enables more granular
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