PIM Designated Router Load Balancing
draft-ietf-pim-drlb-04

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Document Type Active Internet-Draft (pim WG)
Last updated 2014-07-02 (latest revision 2014-06-11)
Replaces draft-hou-pim-drlb
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Intended RFC status Proposed Standard
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Send notices to pim-chairs@tools.ietf.org, draft-ietf-pim-drlb@tools.ietf.org
Network Working Group                                          Yiqun Cai
Internet-Draft                                                 Microsoft
Intended status: Standards Track                          Sri Vallepalli
Expires: December 13, 2014                                      Heidi Ou
                                                     Cisco Systems, Inc.
                                                              Andy Green
                                                         British Telecom
                                                           June 11, 2014

                  PIM Designated Router Load Balancing
                       draft-ietf-pim-drlb-04.txt

Abstract

   On a multi-access network, one of the PIM routers is elected as a
   Designated Router (DR).  On the last hop network, the PIM DR is
   responsible for tracking local multicast listeners and forwarding
   traffic to these listeners if the group is operating in PIM-SM.  In
   this document, we propose a modification to the PIM-SM protocol that
   allows more than one of these last hop routers to be selected so that
   the forwarding load can be distributed among these routers.

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
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   Drafts is at http://datatracker.ietf.org/drafts/current/.

   Internet-Drafts are draft documents valid for a maximum of six months
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   This Internet-Draft will expire on December 13, 2014.

Copyright Notice

   Copyright (c) 2014 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
   (http://trustee.ietf.org/license-info) in effect on the date of

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   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.

Table of Contents

   1.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  Applicability . . . . . . . . . . . . . . . . . . . . . . . .   5
   4.  Functional Overview . . . . . . . . . . . . . . . . . . . . .   5
     4.1.  GDR Candidates  . . . . . . . . . . . . . . . . . . . . .   6
     4.2.  Hash Mask and Hash Algorithm  . . . . . . . . . . . . . .   7
     4.3.  Modulo Hash Algorithm . . . . . . . . . . . . . . . . . .   8
     4.4.  PIM Hello Options . . . . . . . . . . . . . . . . . . . .   9
   5.  Hello Option Formats  . . . . . . . . . . . . . . . . . . . .   9
     5.1.  PIM DR Load Balancing Capability (DRLBC) Hello Option . .   9
     5.2.  PIM DR Load Balancing GDR (DRLBGDR) Hello Option  . . . .  10
   6.  Protocol Specification  . . . . . . . . . . . . . . . . . . .  11
     6.1.  PIM DR Operation  . . . . . . . . . . . . . . . . . . . .  11
     6.2.  PIM GDR Candidate Operation . . . . . . . . . . . . . . .  12
     6.3.  PIM Assert Modification . . . . . . . . . . . . . . . . .  12
   7.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  14
   8.  Security Considerations . . . . . . . . . . . . . . . . . . .  14
   9.  Acknowledgement . . . . . . . . . . . . . . . . . . . . . . .  14
   10. Normative Reference . . . . . . . . . . . . . . . . . . . . .  14
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  15

1.  Terminology

   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].

   With respect to PIM, this document follows the terminology that has
   been defined in [RFC4601].

   This document also introduces the following new acronyms:

   o  GDR: GDR stands for "Group Designated Router".  For each multicast
      flow, either a (*,G) for ASM, or an (S,G) for SSM, a hash
      algorithm (described below) is used to select one of the routers
      as a GDR.  The GDR is responsible for initiating the forwarding
      tree building for the corresponding multicast flow.

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