Bit Index Explicit Replication (BIER) Support via IS-IS
RFC 8401

Document Type RFC - Proposed Standard (June 2018; No errata)
Last updated 2018-06-07
Replaces draft-przygienda-bier-isis-ranges
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Stream WG state Submitted to IESG for Publication (wg milestone: Mar 2018 - Published as propose... )
Document shepherd Hooman Bidgoli
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IESG IESG state RFC 8401 (Proposed Standard)
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Send notices to Hooman Bidgoli <hooman.bidgoli@nokia.com>, aretana.ietf@gmail.com
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Internet Engineering Task Force (IETF)                  L. Ginsberg, Ed.
Request for Comments: 8401                                 Cisco Systems
Category: Standards Track                                  A. Przygienda
ISSN: 2070-1721                                         Juniper Networks
                                                               S. Aldrin
                                                                  Google
                                                                J. Zhang
                                                  Juniper Networks, Inc.
                                                               June 2018

        Bit Index Explicit Replication (BIER) Support via IS-IS

Abstract

   This document defines IS-IS extensions to support multicast
   forwarding using the Bit Index Explicit Replication (BIER)
   architecture.

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/rfc8401.

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.

Ginsberg, et al.             Standards Track                    [Page 1]
RFC 8401                 BIER Support via IS-IS                June 2018

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   3
     2.1.  Requirements Language . . . . . . . . . . . . . . . . . .   4
   3.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   4
   4.  Concepts  . . . . . . . . . . . . . . . . . . . . . . . . . .   5
     4.1.  BIER Domains and Subdomains . . . . . . . . . . . . . . .   5
     4.2.  Advertising BIER Information  . . . . . . . . . . . . . .   5
   5.  Procedures  . . . . . . . . . . . . . . . . . . . . . . . . .   5
     5.1.  Multi-Topology and Subdomain  . . . . . . . . . . . . . .   5
     5.2.  BFR-id Advertisements . . . . . . . . . . . . . . . . . .   6
     5.3.  Logging Misconfiguration  . . . . . . . . . . . . . . . .   6
     5.4.  Flooding Reduction  . . . . . . . . . . . . . . . . . . .   6
   6.  Packet Formats  . . . . . . . . . . . . . . . . . . . . . . .   7
     6.1.  BIER Info Sub-TLV . . . . . . . . . . . . . . . . . . . .   7
     6.2.  BIER MPLS Encapsulation Sub-sub-TLV . . . . . . . . . . .   8
   7.  Security Considerations . . . . . . . . . . . . . . . . . . .   9
   8.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  10
     8.1.  Normative References  . . . . . . . . . . . . . . . . . .  10
     8.2.  Informative References  . . . . . . . . . . . . . . . . .  11
   Acknowledgements  . . . . . . . . . . . . . . . . . . . . . . . .  11
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  12

1.  Introduction

   Bit Index Explicit Replication (BIER) [RFC8279] defines an
   architecture where all intended multicast receivers are encoded as a
   bitmask in the multicast packet header within different
   encapsulations such as described in [RFC8296].  A router that
   receives such a packet will forward the packet based on the bit
   position in the packet header towards the receiver(s) following a
   precomputed tree for each of the bits in the packet.  Each receiver
   is represented by a unique bit in the bitmask.

   This document presents necessary extensions to the currently deployed
   IS-IS for IP [RFC1195] to support distribution of information
   necessary for operation of BIER domains and subdomains.  This
   document defines a new TLV to be advertised by every router
   participating in BIER signaling.

   This document defines support for MPLS encapsulation as specified in
   [RFC8296].  Support for other encapsulation types and the use of
   multiple encapsulation types are outside the scope of this document.

Ginsberg, et al.             Standards Track                    [Page 2]
RFC 8401                 BIER Support via IS-IS                June 2018
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