Reducing Energy Consumption of Router Advertisements
RFC 7772
Document | Type |
RFC - Best Current Practice
(February 2016; No errata)
Also known as BCP 202
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Authors | Andrew Yourtchenko , Lorenzo Colitti | ||
Last updated | 2016-02-11 | ||
Replaces | draft-yc-v6ops-solicited-ra-unicast | ||
Stream | Internent Engineering Task Force (IETF) | ||
Formats | plain text html pdf htmlized (tools) htmlized bibtex | ||
Reviews | |||
Stream | WG state | Submitted to IESG for Publication | |
Document shepherd | Fred Baker | ||
Shepherd write-up | Show (last changed 2015-09-29) | ||
IESG | IESG state | RFC 7772 (Best Current Practice) | |
Action Holders |
(None)
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Consensus Boilerplate | Yes | ||
Telechat date | |||
Responsible AD | Joel Jaeggli | ||
Send notices to | draft-ietf-v6ops-reducing-ra-energy-consumption.all@tools.ietf.org | ||
IANA | IANA review state | IANA OK - No Actions Needed | |
IANA action state | No IANA Actions |
Internet Engineering Task Force (IETF) A. Yourtchenko Request for Comments: 7772 Cisco BCP: 202 L. Colitti Category: Best Current Practice Google ISSN: 2070-1721 February 2016 Reducing Energy Consumption of Router Advertisements Abstract Frequent Router Advertisement messages can severely impact host power consumption. This document recommends operational practices to avoid such impact. Status of This Memo This memo documents an Internet Best Current Practice. This document is a product of the Internet Engineering Task Force (IETF). It represents the consensus of the IETF community. It has received public review and has been approved for publication by the Internet Engineering Steering Group (IESG). Further information on BCPs is available in Section 2 of RFC 5741. Information about the current status of this document, any errata, and how to provide feedback on it may be obtained at http://www.rfc-editor.org/info/rfc7772. 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 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 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. Yourtchenko & Colitti Best Current Practice [Page 1] RFC 7772 Reducing RA Energy Consumption February 2016 Table of Contents 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2 2. Problem Scenarios . . . . . . . . . . . . . . . . . . . . . . 2 2.1. Solicited Multicast RAs on Large Networks . . . . . . . . 2 2.2. Frequent Periodic Router Advertisements . . . . . . . . . 3 3. Consequences . . . . . . . . . . . . . . . . . . . . . . . . 3 4. Router Advertisement Frequency . . . . . . . . . . . . . . . 3 5. Recommendations . . . . . . . . . . . . . . . . . . . . . . . 4 5.1. Network-Side Recommendations . . . . . . . . . . . . . . 4 5.2. Device-Side Recommendations . . . . . . . . . . . . . . . 5 6. Security Considerations . . . . . . . . . . . . . . . . . . . 5 7. References . . . . . . . . . . . . . . . . . . . . . . . . . 5 7.1. Normative References . . . . . . . . . . . . . . . . . . 5 7.2. Informative References . . . . . . . . . . . . . . . . . 6 Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . . 6 Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 6 1. Introduction Routing information is communicated to IPv6 hosts by Router Advertisement (RA) messages [RFC4861]. If these messages are sent too frequently, they can severely impact power consumption on battery-powered hosts. 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]. 2. Problem Scenarios 2.1. Solicited Multicast RAs on Large Networks On links with a large number of battery-powered devices, sending solicited multicast Router Advertisements can severely impact host power consumption. This is because every time a device joins the network, all devices on the network receive a multicast Router Advertisement. In the worst case, if devices are continually joining and leaving the network, and the network is large enough, then all devices on the network will receive solicited Router Advertisements at the maximum rate specified by Section 6.2.6 of [RFC4861], which is one every 3 seconds. Yourtchenko & Colitti Best Current Practice [Page 2] RFC 7772 Reducing RA Energy Consumption February 2016 2.2. Frequent Periodic Router Advertisements Some networks send periodic multicast Router Advertisements very frequently (e.g., once every few seconds). This may be due to a desire to minimize customer impact of network renumbering events, which in some large residential networks occur relatively frequently. In the presence of hosts that ignore RAs or even all IPv6 packets when in sleep mode, such networks may see a need to send RAs frequently in order to avoid leaving devices with non-functional IPv6 configurations for extended periods of time. Unfortunately, this hasShow full document text