BIER support via ISIS
draft-ietf-bier-isis-extensions-01

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Last updated 2015-10-17
Replaces draft-przygienda-bier-isis-ranges
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Internet Engineering Task Force                         L. Ginsberg, Ed.
Internet-Draft                                             Cisco Systems
Intended status: Standards Track                           A. Przygienda
Expires: April 19, 2016                                         Ericsson
                                                               S. Aldrin
                                                                  Google
                                                                J. Zhang
                                                  Juniper Networks, Inc.
                                                        October 17, 2015

                         BIER support via ISIS
                   draft-ietf-bier-isis-extensions-01

Abstract

   Specification of an ISIS extension to support BIER domains and sub-
   domains.

Requirements Language

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
   document are to be interpreted as described in RFC 2119 [RFC2119] .

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
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   This Internet-Draft will expire on April 19, 2016.

Copyright Notice

   Copyright (c) 2015 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

Ginsberg, et al.         Expires April 19, 2016                 [Page 1]
Internet-Draft     draft-ietf-bier-isis-extensions-01       October 2015

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   4
   4.  Concepts  . . . . . . . . . . . . . . . . . . . . . . . . . .   4
     4.1.  BIER Domains and Sub-Domains  . . . . . . . . . . . . . .   4
   5.  Procedures  . . . . . . . . . . . . . . . . . . . . . . . . .   4
     5.1.  Enabling a BIER Sub-Domain  . . . . . . . . . . . . . . .   5
     5.2.  Multi Topology and Sub-Domain . . . . . . . . . . . . . .   5
     5.3.  Encapsulation . . . . . . . . . . . . . . . . . . . . . .   5
     5.4.  Tree Type . . . . . . . . . . . . . . . . . . . . . . . .   5
     5.5.  Label Advertisements for MPLS encapsulated BIER sub-
           domains . . . . . . . . . . . . . . . . . . . . . . . . .   5
       5.5.1.  Special Consideration . . . . . . . . . . . . . . . .   6
     5.6.  BFR-id Advertisements . . . . . . . . . . . . . . . . . .   6
     5.7.  Flooding  . . . . . . . . . . . . . . . . . . . . . . . .   6
   6.  Packet Formats  . . . . . . . . . . . . . . . . . . . . . . .   6
     6.1.  BIER Info sub-TLV . . . . . . . . . . . . . . . . . . . .   7
     6.2.  BIER MPLS Encapsulation sub-sub-TLV . . . . . . . . . . .   8
     6.3.  Optional BIER sub-domain Tree Type sub-sub-TLV  . . . . .   9
     6.4.  Optional BIER sub-domain BSL conversion sub-sub-TLV . . .  10
   7.  Security Considerations . . . . . . . . . . . . . . . . . . .  11
   8.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  11
   9.  Normative References  . . . . . . . . . . . . . . . . . . . .  11
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  12

1.  Introduction

   Bit Index Explicit Replication (BIER)
   [I-D.draft-ietf-bier-architecture-02] defines an architecture where
   all intended multicast receivers are encoded as bitmask in the
   Multicast packet header within different encapsulations such as
   [I-D.draft-ietf-bier-mpls-encapsulation-02].  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.
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