IS-IS Point-to-Multipoint operation
draft-lamparter-isis-p2mp-01

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Network Working Group                                          C. Franke
Internet-Draft                                              D. Lamparter
Intended status: Standards Track                                  NetDEF
Expires: April 21, 2016                                         C. Hopps
                                                        Deutsche Telekom
                                                        October 19, 2015

                  IS-IS Point-to-Multipoint operation
                      draft-lamparter-isis-p2mp-01

Abstract

   This document describes a new mode operation for IS-IS.  In addition
   to the existing LAN and point-to-point modes of operation, a point-
   to-multipoint mode is defined.  This mode is useful for operation
   both on networks with more than two routers where multicast is
   expensive in comparison to unicast, as well on networks where
   creating a LAN pseudonode cannot adequately reflect metrics.

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   include Simplified BSD License text as described in Section 4.e of
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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Point-To-Multipoint Pseudocircuits  . . . . . . . . . . . . .   3
     2.1.  Pseudocircuit behaviour . . . . . . . . . . . . . . . . .   3
       2.1.1.  Representation in LSPs  . . . . . . . . . . . . . . .   3
       2.1.2.  Forwarding  . . . . . . . . . . . . . . . . . . . . .   3
     2.2.  Neighbor IS discovery . . . . . . . . . . . . . . . . . .   3
       2.2.1.  Manual configuration  . . . . . . . . . . . . . . . .   4
       2.2.2.  Lower layer autodiscovery . . . . . . . . . . . . . .   4
       2.2.3.  Multicast autodiscovery . . . . . . . . . . . . . . .   4
     2.3.  Adjacency formation . . . . . . . . . . . . . . . . . . .   5
     2.4.  Pseudocircuit teardown  . . . . . . . . . . . . . . . . .   5
   3.  Configuration model . . . . . . . . . . . . . . . . . . . . .   5
   4.  Security Considerations . . . . . . . . . . . . . . . . . . .   5
   5.  Privacy Considerations  . . . . . . . . . . . . . . . . . . .   5
   6.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   5
   7.  Change Log  . . . . . . . . . . . . . . . . . . . . . . . . .   5
   8.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   6
     8.1.  Normative References  . . . . . . . . . . . . . . . . . .   6
     8.2.  Informative References  . . . . . . . . . . . . . . . . .   6
   Appendix A.  Misconfiguration With P2P over LAN . . . . . . . . .   6
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   6

1.  Introduction

   The core functionality of the protocol outlined in this document
   consists of an additional Subnetwork dependent function per Section 8
   of ISO/IEC 10589:2002 [IS-IS].  In that regard, the next section can
   be understood as new section "8.5 Point-to-multipoint networks".

   The outlined protocol is remotely similar to the derelict section
   "8.3 ISO 8208 subnetworks" [X.25] in that multiple point-to-point
   adjacencies are established on an interface.

   Point-to-multipoint operation of IS-IS is thus not a new idea; in
   fact section 6.2 already mentions "multipoint links."  This document
   re-enables the concept.

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2.  Point-To-Multipoint Pseudocircuits

   In place of ISO 8473 call management [CLNS] establishing sessions,
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