Extensions to RT-Constrain in Hierarchical Route Reflection Scenarios
draft-ietf-idr-rtc-hierarchical-rr-03

Document Type Active Internet-Draft (idr WG)
Last updated 2017-07-03
Replaces draft-dong-idr-rtc-hierarchical-rr
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Network Working Group                                            J. Dong
Internet-Draft                                                   M. Chen
Intended status: Standards Track                     Huawei Technologies
Expires: January 4, 2018                                       R. Raszuk
                                                            Bloomberg LP
                                                            July 3, 2017

 Extensions to RT-Constrain in Hierarchical Route Reflection Scenarios
                 draft-ietf-idr-rtc-hierarchical-rr-03

Abstract

   The Route Target (RT) Constrain mechanism specified in RFC 4684 is
   used to build a route distribution graph in order to restrict the
   propagation of Virtual Private Network (VPN) routes.  In network
   scenarios where hierarchical route reflection (RR) is used, the
   existing RT-Constrain mechanism cannot guarantee a correct route
   distribution graph.  This document describes the problem scenario and
   proposes a solution to address the RT-Constrain issue in hierarchical
   RR scenarios.

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].

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
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   This Internet-Draft will expire on January 4, 2018.

Dong, et al.             Expires January 4, 2018                [Page 1]
Internet-Draft  RT-Constrain in Hierarchical RR Scenario       July 2017

Copyright Notice

   Copyright (c) 2017 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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   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Problem Statement . . . . . . . . . . . . . . . . . . . . . .   2
   3.  Potential Solutions . . . . . . . . . . . . . . . . . . . . .   3
     3.1.  Add-path Based Solution . . . . . . . . . . . . . . . . .   4
     3.2.  Disjoint Alternate Path Solution  . . . . . . . . . . . .   4
   4.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   5
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .   5
   6.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   5
   7.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   5
     7.1.  Normative References  . . . . . . . . . . . . . . . . . .   5
     7.2.  Informative References  . . . . . . . . . . . . . . . . .   6
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   6

1.  Introduction

   The Route Target (RT) Constrain mechanism specified in [RFC4684] is
   used to build a route distribution graph in order to restrict the
   propagation of Virtual Private Network (VPN) routes.  In network
   scenarios where hierarchical route reflection (RR) is used, the
   existing advertisment rules of RT membership information as defined
   in section 3.2 of [RFC4684] cannot guarantee a correct route
   distribution graph.

   This document describes the problem scenario and proposes a solution
   to address the RT-Constrain issue in hierarchical RR scenarios.

2.  Problem Statement

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