Encapsulation for Bit Index Explicit Replication in MPLS and non-MPLS Networks
draft-ietf-bier-mpls-encapsulation-07

Document Type Active Internet-Draft (bier WG)
Last updated 2017-06-28 (latest revision 2017-06-05)
Replaces draft-wijnands-mpls-bier-encapsulation
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Internet Engineering Task Force                        IJ. Wijnands, Ed.
Internet-Draft                                       Cisco Systems, Inc.
Intended status: Standards Track                           E. Rosen, Ed.
Expires: December 7, 2017                         Juniper Networks, Inc.
                                                             A. Dolganow
                                                                   Nokia
                                                             J. Tantsura
                                                              Individual
                                                               S. Aldrin
                                                            Google, Inc.
                                                               I. Meilik
                                                                Broadcom
                                                            June 5, 2017

 Encapsulation for Bit Index Explicit Replication in MPLS and non-MPLS
                                Networks
                 draft-ietf-bier-mpls-encapsulation-07

Abstract

   Bit Index Explicit Replication (BIER) is an architecture that
   provides optimal multicast forwarding through a "multicast domain",
   without requiring intermediate routers to maintain any per-flow state
   or to engage in an explicit tree-building protocol.  When a multicast
   data packet enters the domain, the ingress router determines the set
   of egress routers to which the packet needs to be sent.  The ingress
   router then encapsulates the packet in a BIER header.  The BIER
   header contains a bitstring in which each bit represents exactly one
   egress router in the domain; to forward the packet to a given set of
   egress routers, the bits corresponding to those routers are set in
   the BIER header.  The details of the encapsulation depend on the type
   of network used to realize the multicast domain.  This document
   specifies a BIER encapsulation that can be used in an MPLS network,
   or with slight differences, in a non-MPLS network.

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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   Drafts is at http://datatracker.ietf.org/drafts/current/.

   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at any

Wijnands, et al.        Expires December 7, 2017                [Page 1]
Internet-Draft           BIER MPLS Encapsulation               June 2017

   time.  It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on December 7, 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
   Provisions Relating to IETF Documents
   (http://trustee.ietf.org/license-info) in effect on the date of
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   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  BIER Header . . . . . . . . . . . . . . . . . . . . . . . . .   4
     2.1.  In MPLS Networks  . . . . . . . . . . . . . . . . . . . .   5
       2.1.1.  Encapsulation Initial Four Octets . . . . . . . . . .   5
         2.1.1.1.  The BIER-MPLS Label . . . . . . . . . . . . . . .   5
         2.1.1.2.  Other Fields of the Initial Four Octets . . . . .   7
       2.1.2.  Remainder of Encapsulation  . . . . . . . . . . . . .   7
       2.1.3.  Further Encapsulating a BIER Packet . . . . . . . . .  10
     2.2.  In Non-MPLS Networks  . . . . . . . . . . . . . . . . . .  11
       2.2.1.  Encapsulation Initial Four Octets . . . . . . . . . .  11
         2.2.1.1.  The BIFT-id . . . . . . . . . . . . . . . . . . .  11
         2.2.1.2.  Other Fields of the Initial Four Octets . . . . .  11
       2.2.2.  Remainder of Encapsulation  . . . . . . . . . . . . .  12
       2.2.3.  Further Encapsulating a BIER Packet . . . . . . . . .  13
   3.  Imposing and Processing the BIER Encapsulation  . . . . . . .  14
   4.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  16
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