Internet Engineering Task Force (IETF) JP. Vasseur, Ed.
Request for Comments: 6551 Cisco Systems
Category: Standards Track M. Kim, Ed.
ISSN: 2070-1721 Corporate Technology Group, KT
K. Pister
Dust Networks
N. Dejean
Elster SAS
D. Barthel
France Telecom Orange
March 2012
Routing Metrics Used for Path Calculation in
Low-Power and Lossy Networks
Abstract
Low-Power and Lossy Networks (LLNs) have unique characteristics
compared with traditional wired and ad hoc networks that require the
specification of new routing metrics and constraints. By contrast,
with typical Interior Gateway Protocol (IGP) routing metrics using
hop counts or link metrics, this document specifies a set of link and
node routing metrics and constraints suitable to LLNs to be used by
the Routing Protocol for Low-Power and Lossy Networks (RPL).
Status of This Memo
This is an Internet Standards Track document.
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
Internet Standards 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/rfc6551.
Copyright Notice
Copyright (c) 2012 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
Vasseur, et al. Standards Track [Page 1]RFC 6551 Routing for Path Calculation in LLNs March 2012
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. Introduction ....................................................3
1.1. Requirements Language ......................................6
2. Object Formats ..................................................7
2.1. DAG Metric Container Format ................................7
2.2. Use of Multiple DAG Metric Containers .....................10
2.3. Metric Usage ..............................................10
3. Node Metric/Constraint Objects .................................11
3.1. Node State and Attribute Object ...........................11
3.2. Node Energy Object ........................................12
3.3. Hop Count Object ..........................................16
4. Link Metric/Constraint Objects .................................17
4.1. Throughput ................................................17
4.2. Latency ...................................................18
4.3. Link Reliability ..........................................19
4.3.1. The Link Quality Level Reliability Metric ..........19
4.3.2. The ETX Reliability Object .........................21
4.4. Link Color Object .........................................22
4.4.1. Link Color Object Description ......................22
4.4.2. Mode of Operation ..................................24
5. Computation of Dynamic Metrics and Attributes ..................24
6. IANA Considerations ............................................25
6.1. Routing Metric/Constraint Type ............................25
6.2. Routing Metric/Constraint TLVs ............................25
6.3. Routing Metric/Constraint Common Header Flag Field ........26
6.4. Routing Metric/Constraint Common Header A Field ...........26
6.5. NSA Object Flags Field ....................................26
6.6. Hop-Count Object Flags Field ..............................27
6.7. Node Type Field ...........................................27
datatracker.ietf.org