BIER Underlay Path Calculation Algorithm and Contraints
draft-ietf-bier-bar-ipa-01

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Last updated 2018-04-10
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BIER                                                            Z. Zhang
Internet-Draft                                             A. Przygienda
Intended status: Standards Track                        Juniper Networks
Expires: October 12, 2018                                    A. Dolganow
                                                              H. Bidgoli
                                                                   Nokia
                                                             I. Wijnands
                                                           Cisco Systems
                                                                A. Gulko
                                                         Thomson Reuters
                                                          April 10, 2018

        BIER Underlay Path Calculation Algorithm and Contraints
                       draft-ietf-bier-bar-ipa-01

Abstract

   This document specifies general rules for interaction between the BAR
   and IPA fields defined in [I-D.ietf-bier-isis-extensions] and
   [I-D.ietf-bier-ospf-bier-extensions].

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 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
   Task Force (IETF).  Note that other groups may also distribute
   working documents as Internet-Drafts.  The list of current Internet-
   Drafts is at https://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
   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 October 12, 2018.

Zhang, et al.           Expires October 12, 2018                [Page 1]
Internet-Draft                bier-bar-ipa                    April 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
   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
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   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.

Table of Contents

   1.  Terminologies . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   3.  General Rules for the BAR and IPA fields  . . . . . . . . . .   3
     3.1.  When BAR Is Not Used  . . . . . . . . . . . . . . . . . .   4
     3.2.  Exceptions/Extensions to the General Rules  . . . . . . .   4
   4.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   4
   5.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   4
   6.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   4
     6.1.  Normative References  . . . . . . . . . . . . . . . . . .   4
     6.2.  Informative References  . . . . . . . . . . . . . . . . .   5
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   5

1.  Terminologies

   Familiarity with BIER protocols and procedures is assumed.  Some
   terminologies are listed below for convenience.

   [To be added].

2.  Introduction

   In the BIER architecture, packets with a BIER encapsulation header
   are forwarded to the neighbors on the underlay paths towards the
   BFERs.  For each sub-domain, the paths are calculated in the underlay
   topology for the sub-domain, following a calculation algorithm
   specific to the sub-domain.  The <topology, algorithm> could be
   congruent or incongruent with unicast.  The topology could be a
   default topology, a multi-topology [RFC5120] topology.  The algorithm
   could be a generic IGP algorithm (e.g.  SPF) or could be a BIER
   specific one defined in the future.

Zhang, et al.           Expires October 12, 2018                [Page 2]
Internet-Draft                bier-bar-ipa                    April 2018

   In [I-D.ietf-bier-isis-extensions] and
   [I-D.ietf-bier-ospf-bier-extensions], an 8-bit BAR field and 8-bit
   IPA field are defined to signal the BIER specific algorithm and
   generic IGP Algorithm respectively and only value 0 is allowed for
   both fields currently.  This document specifies the general rules for
   the two fields and their interaction when either or both fields are
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