OSPFv2 Extensions for Bit Index Explicit Replication (BIER)
RFC 8444

Document Type RFC - Proposed Standard (November 2018; No errata)
Last updated 2018-11-14
Replaces draft-psenak-ospf-bier-extensions
Stream IETF
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Reviews
Stream WG state Submitted to IESG for Publication (wg milestone: Mar 2018 - Published as propose... )
Document shepherd Reshad Rahman
Shepherd write-up Show (last changed 2018-02-01)
IESG IESG state RFC 8444 (Proposed Standard)
Consensus Boilerplate Yes
Telechat date
Responsible AD Alvaro Retana
Send notices to Reshad Rahman <rrahman@cisco.com>, aretana.ietf@gmail.com
IANA IANA review state Version Changed - Review Needed
IANA action state RFC-Ed-Ack
Internet Engineering Task Force (IETF)                    P. Psenak, Ed.
Request for Comments: 8444                                      N. Kumar
Category: Standards Track                                   IJ. Wijnands
ISSN: 2070-1721                                                    Cisco
                                                             A. Dolganow
                                                                   Nokia
                                                           T. Przygienda
                                                                J. Zhang
                                                  Juniper Networks, Inc.
                                                               S. Aldrin
                                                            Google, Inc.
                                                           November 2018

      OSPFv2 Extensions for Bit Index Explicit Replication (BIER)

Abstract

   Bit Index Explicit Replication (BIER) is an architecture that
   provides optimal multicast forwarding through a "BIER domain" without
   requiring intermediate routers to maintain multicast-related, per-
   flow state.  BIER also does not require an explicit tree-building
   protocol for its operation.  A multicast data packet enters a BIER
   domain at a Bit-Forwarding Ingress Router (BFIR) and leaves the BIER
   domain at one or more Bit-Forwarding Egress Routers (BFERs).  The
   BFIR adds a BIER packet header to the packet.  The BIER packet header
   contains a BitString in which each bit represents exactly one BFER to
   forward the packet to.  The set of BFERs to which the multicast
   packet needs to be forwarded is expressed by the set of bits in the
   BIER packet header.

   This document describes the OSPF protocol extension (from RFC 2328)
   that is required for BIER with MPLS encapsulation (which is defined
   in RFC 8296).  Support for other encapsulation types and the use of
   multiple encapsulation types are outside the scope of this document.

Psenak, et al.               Standards Track                    [Page 1]
RFC 8444               OSPFv2 Extensions for BIER          November 2018

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
   https://www.rfc-editor.org/info/rfc8444.

Copyright Notice

   Copyright (c) 2018 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
   carefully, as they describe your rights and restrictions with respect
   to this document.  Code Components extracted from this document must
   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Psenak, et al.               Standards Track                    [Page 2]
RFC 8444               OSPFv2 Extensions for BIER          November 2018

Table of Contents

   1. Introduction ....................................................3
   2. Flooding of the BIER Information in OSPF ........................4
      2.1. BIER Sub-TLV ...............................................4
      2.2. BIER MPLS Encapsulation Sub-TLV ............................5
      2.3. Flooding Scope of BIER Information .........................7
   3. Security Considerations .........................................8
   4. IANA Considerations .............................................9
   5. References ......................................................9
      5.1. Normative References .......................................9
      5.2. Informative References ....................................10
   Acknowledgments ...................................................11
   Authors' Addresses ................................................11

1.  Introduction

   Bit Index Explicit Replication (BIER) is an architecture that
   provides optimal multicast forwarding through a "BIER domain" without
   requiring intermediate routers to maintain any multicast-related,
   per-flow state.  Neither does BIER explicitly require a tree-building
   protocol for its operation.  A multicast data packet enters a BIER
   domain at a Bit-Forwarding Ingress Router (BFIR) and leaves the BIER
   domain at one or more Bit-Forwarding Egress Routers (BFERs).  The
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