Multicast Considerations over IEEE 802 Wireless Media
draft-ietf-mboned-ieee802-mcast-problems-12

Document Type Active Internet-Draft (mboned WG)
Authors Charles Perkins  , Mike McBride  , Dorothy Stanley  , Warren Kumari  , Juan-Carlos Zúñiga 
Last updated 2020-11-09 (latest revision 2020-10-26)
Replaces draft-mcbride-mboned-wifi-mcast-problem-statement, draft-perkins-intarea-multicast-ieee802
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Internet Area                                                 C. Perkins
Internet-Draft                                      Blue Meadow Networks
Intended status: Informational                                M. McBride
Expires: April 29, 2021                                        Futurewei
                                                              D. Stanley
                                                                     HPE
                                                               W. Kumari
                                                                  Google
                                                              JC. Zuniga
                                                                  SIGFOX
                                                        October 26, 2020

         Multicast Considerations over IEEE 802 Wireless Media
              draft-ietf-mboned-ieee802-mcast-problems-12

Abstract

   Well-known issues with multicast have prevented the deployment of
   multicast in 802.11 (wifi) and other local-area wireless
   environments.  This document describes the problems of known
   limitations with wireless (primarily 802.11) Layer-2 multicast.  Also
   described are certain multicast enhancement features that have been
   specified by the IETF, and by IEEE 802, for wireless media, as well
   as some operational choices that can be taken to improve the
   performance of the network.  Finally, some recommendations are
   provided about the usage and combination of these features and
   operational choices.

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 April 29, 2021.

Perkins, et al.          Expires April 29, 2021                 [Page 1]
Internet-Draft      Multicast Over IEEE 802 Wireless        October 2020

Copyright Notice

   Copyright (c) 2020 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.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   5
   3.  Identified multicast issues . . . . . . . . . . . . . . . . .   5
     3.1.  Issues at Layer 2 and Below . . . . . . . . . . . . . . .   5
       3.1.1.  Multicast reliability . . . . . . . . . . . . . . . .   6
       3.1.2.  Lower and Variable Data Rate  . . . . . . . . . . . .   6
       3.1.3.  Capacity and Impact on Interference . . . . . . . . .   7
       3.1.4.  Power-save Effects on Multicast . . . . . . . . . . .   7
     3.2.  Issues at Layer 3 and Above . . . . . . . . . . . . . . .   8
       3.2.1.  IPv4 issues . . . . . . . . . . . . . . . . . . . . .   8
       3.2.2.  IPv6 issues . . . . . . . . . . . . . . . . . . . . .   8
       3.2.3.  MLD issues  . . . . . . . . . . . . . . . . . . . . .   9
       3.2.4.  Spurious Neighbor Discovery . . . . . . . . . . . . .   9
   4.  Multicast protocol optimizations  . . . . . . . . . . . . . .  10
     4.1.  Proxy ARP in 802.11-2012  . . . . . . . . . . . . . . . .  10
     4.2.  IPv6 Address Registration and Proxy Neighbor Discovery  .  11
     4.3.  Buffering to Improve Battery Life . . . . . . . . . . . .  12
     4.4.  Limiting multicast buffer hardware queue depth  . . . . .  13
     4.5.  IPv6 support in 802.11-2012 . . . . . . . . . . . . . . .  13
     4.6.  Using Unicast Instead of Multicast  . . . . . . . . . . .  14
       4.6.1.  Overview  . . . . . . . . . . . . . . . . . . . . . .  14
       4.6.2.  Layer 2 Conversion to Unicast . . . . . . . . . . . .  14
       4.6.3.  Directed Multicast Service (DMS)  . . . . . . . . . .  14
       4.6.4.  Automatic Multicast Tunneling (AMT) . . . . . . . . .  15
     4.7.  GroupCast with Retries (GCR)  . . . . . . . . . . . . . .  15
   5.  Operational optimizations . . . . . . . . . . . . . . . . . .  16
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