Generic Route Constraint Distribution Mechanism for BGP
draft-zzhang-idr-bgp-rt-constrains-extension-01

Document Type Active Internet-Draft (individual)
Authors Zhaohui Zhang  , Jeffrey Haas 
Last updated 2021-01-11
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idr                                                             Z. Zhang
Internet-Draft                                                   J. Haas
Updates: 4684 (if approved)                             Juniper Networks
Intended status: Standards Track                        January 11, 2021
Expires: July 15, 2021

        Generic Route Constraint Distribution Mechanism for BGP
            draft-zzhang-idr-bgp-rt-constrains-extension-01

Abstract

   This document defines a mechanism based upon Constrained Route
   Distribution for BGP (RFC 4684) that works with various types of BGP
   Community-like Path Attributes.  Similar to RFC 4684, this mechanism
   can be used to build a route distribution graph to limit the
   propagation of BGP Routes.  Unlike RFC 4684, this mechanism is not
   restricted to BGP Extended Communities (RFC 4360).

Requirements Language

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and
   "OPTIONAL" in this document are to be interpreted as described in BCP
   14 [RFC2119] [RFC8174] when, and only when, they appear in all
   capitals, as shown here.

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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   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on July 15, 2021.

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Copyright Notice

   Copyright (c) 2021 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
     1.1.  Constrained Route Distribution  . . . . . . . . . . . . .   3
     1.2.  Brief Summary of Constrained Route Distribution Procedure   3
     1.3.  Need for a Generic Route Constraint Distribution
           Mechanism . . . . . . . . . . . . . . . . . . . . . . . .   4
   2.  Community-like Attributes . . . . . . . . . . . . . . . . . .   5
     2.1.  Definition of Community-like Attributes . . . . . . . . .   5
     2.2.  Prefix Structure of BGP Community-like Attributes . . . .   5
   3.  Specification . . . . . . . . . . . . . . . . . . . . . . . .   7
     3.1.  NLRI Definition . . . . . . . . . . . . . . . . . . . . .   7
     3.2.  NLRI Length Encoding  . . . . . . . . . . . . . . . . . .   7
     3.3.  Operation . . . . . . . . . . . . . . . . . . . . . . . .   8
   4.  Examples  . . . . . . . . . . . . . . . . . . . . . . . . . .   8
     4.1.  IPv6 Specific Extended Communities  . . . . . . . . . . .   8
     4.2.  Large BGP Communities . . . . . . . . . . . . . . . . . .   9
     4.3.  Bitmask Route Target  . . . . . . . . . . . . . . . . . .  10
       4.3.1.  AS Number Bitmask Route Target  . . . . . . . . . . .  11
       4.3.2.  IPv6 Address Bitmask Route Target . . . . . . . . . .  11
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .  11
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  11
   7.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  12
   8.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  12
     8.1.  Normative References  . . . . . . . . . . . . . . . . . .  12
     8.2.  Informative References  . . . . . . . . . . . . . . . . .  13
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  14

1.  Introduction

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1.1.  Constrained Route Distribution

   In BGP/MPLS Layer 3 VPNs [RFC4364], Route Target Extended Communities
   [RFC4360] are used to control VPN membership.  Networks providing VPN
   services may be large.  In such networks, VPN routes for a given VPN
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