Protocol Independent Multicast DR Load Balancing
draft-ietf-pim-drlb-00

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Last updated 2012-03-06
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Network Working Group                                          Yiqun Cai
Internet-Draft                                            Sri Vallepalli
Intended status: Standards Track                                Heidi Ou
Expires: September 7, 2012                           Cisco Systems, Inc.
                                                              Andy Green
                                                         British Telecom
                                                           March 6, 2012

            Protocol Independent Multicast DR Load Balancing
                       draft-ietf-pim-drlb-00.txt

Abstract

   On a multi-access network such as an Ethernet, one of the PIM routers
   is elected as a Designated Routers (DR).  The PIM DR has two roles in
   the PIM protocol.  On the first hop network, the PIM DR is
   responsible for registering an active source to the RP if the group
   is operated in PIM SM.  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 operated in PIM SM/SSM/DM.
   In this document, we propose a modification to the PIM protocol that
   allows multiple of these last hop routers to be selected so that the
   forwarding load can be distributed to and handled among these
   routers.  A router responsible for forwarding for a particular group
   is called a Group Designated Router (GDR).

Status of this Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

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   This Internet-Draft will expire on September 7, 2012.

Copyright Notice

   Copyright (c) 2012 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

Yiqun Cai, et al.       Expires September 7, 2012               [Page 1]
Internet-Draft           PIMv2 DR Load Balancing              March 2012

   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
   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  . . . . . . . . . . . . . . . . . . . . . . . .  3
   2.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  3
   3.  Applicability  . . . . . . . . . . . . . . . . . . . . . . . .  6
   4.  Functional Overview  . . . . . . . . . . . . . . . . . . . . .  6
     4.1.  GDR Candidates . . . . . . . . . . . . . . . . . . . . . .  7
     4.2.  Hash Mask  . . . . . . . . . . . . . . . . . . . . . . . .  7
     4.3.  PIM Hello Options  . . . . . . . . . . . . . . . . . . . .  8
   5.  Packet Format  . . . . . . . . . . . . . . . . . . . . . . . .  8
     5.1.  PIM DR Load Balancing GDR (LBGDR) Hello TLV  . . . . . . .  8
     5.2.  PIM DR Load Balancing Hash Masks (LBM) Hello TLV . . . . .  9
   6.  Protocol Specification . . . . . . . . . . . . . . . . . . . .  9
     6.1.  PIM DR Operation . . . . . . . . . . . . . . . . . . . . . 10
     6.2.  PIM GDR Candidate Operation  . . . . . . . . . . . . . . . 10
     6.3.  PIM Assert Modification  . . . . . . . . . . . . . . . . . 11
   7.  IANA Considerations  . . . . . . . . . . . . . . . . . . . . . 12
   8.  Security Considerations  . . . . . . . . . . . . . . . . . . . 12
   9.  Acknowledgement  . . . . . . . . . . . . . . . . . . . . . . . 12
   10. References . . . . . . . . . . . . . . . . . . . . . . . . . . 12
     10.1. Normative Reference  . . . . . . . . . . . . . . . . . . . 12
     10.2. Informative References . . . . . . . . . . . . . . . . . . 12
   Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 13

Yiqun Cai, et al.       Expires September 7, 2012               [Page 2]
Internet-Draft           PIMv2 DR Load Balancing              March 2012

1.  Terminologies

   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
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