An Optional Encoding of the BIFT-id Field in the non-MPLS BIER Encapsulation
draft-ietf-bier-non-mpls-bift-encoding-00

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Last updated 2018-04-16
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BIER Working Group                                          IJ. Wijnands
Internet-Draft                                             Cisco Systems
Intended status: Informational                                     X. Xu
Expires: October 15, 2018                                  Alibaba Group
                                                              H. Bidgoli
                                                                   Nokia
                                                          April 13, 2018

     An Optional Encoding of the BIFT-id Field in the non-MPLS BIER
                             Encapsulation
               draft-ietf-bier-non-mpls-bift-encoding-00

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.  The Multicast
   packet is encapsulated using a BIER Header and transported through an
   MPLS or non-MPLS network.  When MPLS is used as the transport, the
   Bit Indexed Forwarding Table (BIFT) is identified by a MPLS Label.
   When non-MPLS transport is used, the BIFT is identified by a 20bit
   value.  This document describes one way of encoding the 20bit value.

Status of This Memo

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   This Internet-Draft will expire on October 15, 2018.

Copyright Notice

   Copyright (c) 2018 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

Wijnands, et al.        Expires October 15, 2018                [Page 1]
Internet-Draft     Non-MPLS BIER BIFT-id Encapsulation        April 2018

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Terminology and Definitions . . . . . . . . . . . . . . . . .   3
   3.  Specification of Requirements . . . . . . . . . . . . . . . .   3
   4.  The Bit Index Forwarding Table  . . . . . . . . . . . . . . .   3
   5.  The Non-MPLS Static BIFT Encoding . . . . . . . . . . . . . .   4
   6.  Security Considerations . . . . . . . . . . . . . . . . . . .   4
   7.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   4
   8.  Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .   4
   9.  Normative References  . . . . . . . . . . . . . . . . . . . .   5
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   5

1.  Introduction

   Bit Index Explicit Replication (BIER) [RFC8279] 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.  The
   Multicast packet is encapsulated [RFC8296] using a BIER Header and
   transported through an MPLS or non-MPLS network.  When MPLS is used
   as the transport, the Bit Indexed Forwarding Table (BIFT) is
   identified by a MPLS Label.  When non-MPLS transport is used, the
   BIFT is identified by a 20bit value.  This document describes one way
   of encoding the 20bit value, based on the Sub-Domain (SD), Set
   Identifier (SI) and BitStringLength (BSL) values.

   The BIER architecture requires that a BFR has a BIFT for every
   combination of <SD, SI, BSL> that is being used.  When processing a
   BIER packet, the correct BIFT is inferred from the BIFT-id field of
   the encapsulation.  When the non-MPLS encapsulation is used in a
   given BIER domain, it may be desirable for the a BIFT-id to be unique
   in that domain.  This document describes an OPTIONAL method that can
   be used to form domain-wide unique BIFT-ids based on the <SD, SI,
   BSL> triples.  If in the future the BIER architecture is extented
   with an additonal BIFT argument, this encoding does not generate
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