Subject: Re: [Roll] I-D Action:draft-ietf-roll-routing-metrics-17.txt

From: Joakim Eriksson <[email-masked]>
Date: Fri, 04 Feb 2011 21:39:10 +0100

I had a quick read of the metrics draft and there is an
inconsistency in the ETX section (8 vs 16 bits).

Early in the section it is specified:
"Each ETX sub-object has a fixed length of 8 bits"

But just below there is a figure and a text explaining
that it is 16 bits:

  0                   1
  0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|              ETX              |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

  Figure 13: ETX sub-object format

ETX: 16 bits. The ETX * 128 is encoded using 16 bits in unsigned
integer format, rounded off to the nearest whole number.

Best regards,
-- Joakim Eriksson, SICS

[email-masked] skrev 2011-01-30 13:00:
> A New Internet-Draft is available from the on-line Internet-Drafts directories.
> This draft is a work item of the Routing Over Low power and Lossy networks Working Group of the IETF.
>
>
> 	Title           : Routing Metrics used for Path Calculation in Low Power and Lossy Networks
> 	Author(s)       : J. Vasseur, et al.
> 	Filename        : draft-ietf-roll-routing-metrics-17.txt
> 	Pages           : 30
> 	Date            : 2011-01-30
>
> 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 for Low Power and lossy networks (RPL) routing protocol.
>
> A URL for this Internet-Draft is:
> http://www.ietf.org/internet-drafts/draft-ietf-roll-routing-metrics-17.txt
>
> Internet-Drafts are also available by anonymous FTP at:
> ftp://ftp.ietf.org/internet-drafts/
>
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> Internet-Draft.
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