Registry and Extensions for P-Multicast Service Interface Tunnel Attribute Flags
RFC 7902

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Internet Engineering Task Force (IETF)                          E. Rosen
Request for Comments: 7902                        Juniper Networks, Inc.
Updates: 6514                                                   T. Morin
Category: Standards Track                                         Orange
ISSN: 2070-1721                                                June 2016

                      Registry and Extensions for
          P-Multicast Service Interface Tunnel Attribute Flags

Abstract

   The BGP-based control procedures for Multicast Virtual Private
   Networks (MVPNs) make use of a BGP attribute known as the
   "P-Multicast Service Interface (PMSI) Tunnel" attribute.  The
   attribute contains a one-octet "Flags" field.  The purpose of this
   document is to establish an IANA registry for the assignment of the
   bits in this field.  Since the "Flags" field contains only eight
   bits, this document also defines a new BGP Extended Community,
   "Additional PMSI Tunnel Attribute Flags", that can be used to carry
   additional flags for the "P-Multicast Service Interface (PMSI)
   Tunnel" attribute.  This document updates RFC 6514.

Status of This Memo

   This is an Internet Standards Track document.

   This document is a product of the Internet Engineering Task Force
   (IETF).  It represents the consensus of the IETF community.  It has
   received public review and has been approved for publication by the
   Internet Engineering Steering Group (IESG).  Further information on
   Internet Standards is available in Section 2 of RFC 7841.

   Information about the current status of this document, any errata,
   and how to provide feedback on it may be obtained at
   http://www.rfc-editor.org/info/rfc7902.

Rosen & Morin                Standards Track                    [Page 1]
RFC 7902               PMSI Tunnel Attribute Flags             June 2016

Copyright Notice

   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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   publication of this document.  Please review these documents
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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.  Extending the "PMSI Tunnel" Attribute "Flags" Field . . . . .   3
   3.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   5
   4.  Security Considerations . . . . . . . . . . . . . . . . . . .   6
   5.  Normative References  . . . . . . . . . . . . . . . . . . . .   6
   Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . . .   7
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   7

1.  Introduction

   A BGP attribute, "P-Multicast Service Interface (PMSI) Tunnel"
   attribute is defined in [RFC6514].  This attribute, referred to as
   the "PMSI Tunnel" attribute in this document, contains a one-octet
   "Flags" field.  Only one flag is defined in that RFC, but there is
   now a need to define additional flags.  However, that RFC did not
   create an IANA registry for the assignment of bits in the "Flags"
   field.  This document creates a registry for that purpose.  In
   addition, there may be a need to define more than eight flags.
   Therefore this document defines a new BGP Extended Community,
   "Additional PMSI Tunnel Attribute Flags", that can be used to carry
   additional flags for the "PMSI Tunnel" attribute.  A registry is also
   created for this Extended Community, allowing IANA to assign flag
   bits from the Extended Community's six-octet value field.

   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 [RFC2119].

Rosen & Morin                Standards Track                    [Page 2]
RFC 7902               PMSI Tunnel Attribute Flags             June 2016

2.  Extending the "PMSI Tunnel" Attribute "Flags" Field

   In [RFC6514], only a single octet in the "PMSI Tunnel" attribute is
   defined to carry bit flags.  This allows eight flags, which is
   unlikely to be sufficient for all future applications.

   This document defines a new Transitive Opaque Extended Community
   ([RFC4360] [RFC7153]), "Additional PMSI Tunnel Attribute Flags".  It
   also defines a new bit flag in the "PMSI Tunnel" attribute "Flags"
   field, called the "Extension" flag.

   The "Additional PMSI Tunnel Attribute Flags" Extended Community MUST
   NOT be carried by a given BGP UPDATE message unless the following