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Mobile Ad Hoc Networks [manet] C. Perkins
Internet-Draft Futurewei
Intended status: Standards Track March 3, 2016
Expires: September 4, 2016


Using Layer 3 Multicast Suppression Protocols Above Layer 3
draft-perkins-manet-using-rfc6621-00.txt

Abstract

This document specifies how protocols operating at layers above layer
3 can use the multicast suppression algorithms, for instance the
algorithms specified in RFC 6621.

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 http://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 September 4, 2016.

Copyright Notice

Copyright (c) 2016 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
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the Trust Legal Provisions and are provided without warranty as
described in the Simplified BSD License.





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Table of Contents

1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 2
3. Use of multicast suppression algorithms above Layer 3 . . . . 3
4. Security Considerations . . . . . . . . . . . . . . . . . . . 3
5. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 3
6. Informative References . . . . . . . . . . . . . . . . . . . 3
Author's Address . . . . . . . . . . . . . . . . . . . . . . . . 4

1. Introduction

Limiting the number of multicast forwarders provides performance
benefits when used with a protocol that relies on flooding messages
throughout a network. Some good multicast suppression methods for
limiting the number of multicast forwarders while maintaining
complete network coverage are specified in RFC 6621 [RFC6621].
Routing protocols that use multicast can offer much greater
performance using multicast suppression algorithms. Such algorithms
do not affect the origination of multicast messages, but only
determine whether a node needs to forward incoming multicast messages
that are intended to flood the network. Enabling performance
benefits for reactive manet routing protocols was a strong motivating
factor in the development and publication of RFC 6621.

RFC 6621 multicast suppression algorithms are specified to operate at
layer 3. Manet routing protocols use RFC 5444 [RFC5444] as a message
bundling layer; they operate above layer 3. Such protocols specify
that incoming multicast control messages have to be processed before
regeneration; in other words, the incoming multicast message is not
forwarded at all. Manet control messages are sent with the IP
destination address set to the link-local multicast address LL-MANET-
Routers [RFC5498] unless otherwise specified. This document
specifies a way to use layer 3 multicast suppression algorithms at a
layer above layer 3 so that algorithms that require network-wide
flooding can reap the benefits of layer-3 multicast suppression
algorithms.

2. Terminology

This document defines the following terminology:

Forwarding Node
A node that currently forwards incoming multicast messages to its
neighbors, based on the results of running a multicast suppression
algorithm.

Multicast Suppression Algorithm



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An algorithm that determines which multicast routers are required
for complete coverage of a multicast group; retransmission by
other multicast routers for the multicast group is unnecessary.

Regeneration
Transmission of a message formed by processing and modification of
an incoming message for an operation requiring the attention of
members of a multicast group.

3. Use of multicast suppression algorithms above Layer 3

If the node is not currently a multicast forwarding node, then the
node does not regenerate multicast messages even if the conditions
for regeneration are satisfied.

For example, if an AODVv2 [I-D.ietf-manet-aodvv2] router is not
currently a multicast forwarding node, then it does not regenerate
multicast messages (e.g., RREQ or RERR) even if the conditions for
regeneration are satisfied. This restriction only applies for
regeneration, and does not apply for multicast RREQ or RERR messages
originated by the node.

4. Security Considerations

This document does not introduce any security mechanisms, and does
not have any impact on existing security mechanisms.

5. IANA Considerations

This document does not specify any IANA actions.

6. Informative References

[I-D.ietf-manet-aodvv2]
Perkins, C., Ratliff, S., Dowdell, J., Steenbrink, L., and
V. Mercieca, "Ad Hoc On-demand Distance Vector Version 2
(AODVv2) Routing", draft-ietf-manet-aodvv2-13 (work in
progress), January 2016.

[RFC5444] Clausen, T., Dearlove, C., Dean, J., and C. Adjih,
"Generalized Mobile Ad Hoc Network (MANET) Packet/Message
Format", RFC 5444, DOI 10.17487/RFC5444, February 2009,
.

[RFC5498] Chakeres, I., "IANA Allocations for Mobile Ad Hoc Network
(MANET) Protocols", RFC 5498, DOI 10.17487/RFC5498, March
2009, .




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[RFC6621] Macker, J., Ed., "Simplified Multicast Forwarding",
RFC 6621, DOI 10.17487/RFC6621, May 2012,
.

Author's Address

Charles E. Perkins
Futurewei Inc.
2330 Central Expressway
Santa Clara, CA 95050
USA

Phone: +1-408-330-4586
Email: charliep@computer.org





































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