OSPFv3 Extensions for BIER
draft-psenak-bier-ospfv3-extensions-02

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Last updated 2018-11-14
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Network Work group                                        P. Psenak, Ed.
Internet-Draft                                            N. Nainar, Ed.
Intended status: Standards Track                            IJ. Wijnands
Expires: May 18, 2019                                Cisco Systems, Inc.
                                                       November 14, 2018

                       OSPFv3 Extensions for BIER
                 draft-psenak-bier-ospfv3-extensions-02

Abstract

   Bit Index Explicit Replication (BIER) is an architecture that
   provides multicast forwarding through a "BIER domain" without
   requiring intermediate routers to maintain multicast related per-flow
   state.  Neither does BIER 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 router
   adds a BIER header to the packet.  Such header contains a bit-string
   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 according set of bits set in BIER
   packet header.

   This document describes the OSPFv3 [RFC8362] protocol extensions
   required for BIER with MPLS encapsulation [RFC8296].  Support for
   other encapsulation types is outside the scope of this document.  The
   use of multiple encapsulation types is outside the scope of this
   document.

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
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   This Internet-Draft will expire on May 18, 2019.

Psenak, et al.            Expires May 18, 2019                  [Page 1]
Internet-Draft         OSPFv3 Extensions for BIER          November 2018

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
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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Flooding of the BIER Information in OSPFv3  . . . . . . . . .   3
     2.1.  BIER Sub-TLV  . . . . . . . . . . . . . . . . . . . . . .   3
     2.2.  BIER MPLS Encapsulation Sub-TLV . . . . . . . . . . . . .   5
     2.3.  Flooding scope of BIER Information  . . . . . . . . . . .   6
   3.  Security Considerations . . . . . . . . . . . . . . . . . . .   7
   4.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   8
   5.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   9
   6.  Normative References  . . . . . . . . . . . . . . . . . . . .   9
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  10

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 BFIR router adds a BIER header to the packet.  The BIER header
   contains a bit-string 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 setting the bits that
   correspond to those routers in the BIER header.

   BIER architecture requires routers participating in BIER to exchange
   BIER related information within a given domain.  BIER architecture
   permits link-state routing protocols to perform distribution of such
   information.  [RFC8444] proposes the OSPFv2 protocol extensions to
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