PIM Flooding Mechanism and Source Discovery for BIER
draft-venaas-bier-pfm-sd-00

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Last updated 2018-10-22
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Network Working Group                                          S. Venaas
Internet-Draft                                              IJ. Wijnands
Intended status: Experimental                                  M. Mishra
Expires: April 25, 2019                              Cisco Systems, Inc.
                                                            M. Sivakumar
                                                        Juniper Networks
                                                        October 22, 2018

          PIM Flooding Mechanism and Source Discovery for BIER
                      draft-venaas-bier-pfm-sd-00

Abstract

   PIM Flooding Mechanism and Source Discovery (PFM-SD) is a mechanism
   for source discovery within a PIM domain.  PIM signaling over BIER
   has been defined, allowing for BIER to interoperate with PIM.  This
   document defines PFM-SD over BIER, such that PFM-SD can be used by
   PIM in a PIM domain to discover sources that are reachable via BIER.
   Also, this document provides PFM-SD extensions to discover the BIER
   ingress router closest to the source.  This can be used by BIER
   overlays, such as PIM signaling over BIER, to determine which router
   to signal.

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   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

Venaas, et al.           Expires April 25, 2019                 [Page 1]
Internet-Draft        PIM Source Discovery for BIER         October 2018

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Conventions Used in This Document . . . . . . . . . . . .   3
   2.  PFM over BIER . . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  PFM Ingress BIER Router TLV . . . . . . . . . . . . . . . . .   3
   4.  Group Source Holdtime Metric TLV  . . . . . . . . . . . . . .   4
   5.  BIER signaling enhancements . . . . . . . . . . . . . . . . .   6
   6.  Security Considerations . . . . . . . . . . . . . . . . . . .   6
   7.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   6
   8.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   6
     8.1.  Normative References  . . . . . . . . . . . . . . . . . .   6
     8.2.  Informative References  . . . . . . . . . . . . . . . . .   7
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   7

1.  Introduction

   PIM Flooding Mechanism (PFM) and Source Discovery (SD) [RFC8364]
   provides a generic flooding mechanism for distributing information
   throughout a PIM domain.  In particular it allows for source
   discovery.  There are various deployment scenarios where PIM and BIER
   need to co-exist.  For instance, consider migration scenarios where a
   few routers in a PIM domain are upgraded to support BIER.  In that
   case, one may use PIM Signaling Through BIER Core
   [I-D.ietf-bier-pim-signaling], allowing PIM to build trees passing
   through the BIER routers.  This document defines PFM over BIER.  This
   allows PFM to pass through the BIER routers, allowing PFM to be used
   in the PIM domain.

   One challenge with PIM signaling over BIER
   [I-D.ietf-bier-pim-signaling] is to determine which BIER router is
   closest to the source.  A number of options are discussed in that
   document.  This document provides an alternative solution for
   discovering which BIER router to signal.  It may also be used with
   other signaling mechanisms such as IGMP/MLD [I-D.ietf-bier-mld].
   This is achieved by introducing two new PFM TLVs.  When a BIER router
   forwards a PFM message into BIER, it adds a new TLV specifying the
   BIER sub-domain, its BFR-ID and its BIER prefix.  Also, any Group
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