Re: [Roll] ticket - 172 - clarify units of trickle timers

Kerry Lynn <kerlyn@ieee.org> Mon, 17 August 2015 18:12 UTC

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From: Kerry Lynn <kerlyn@ieee.org>
To: Routing Over Low power and Lossy networks <roll@ietf.org>
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Subject: Re: [Roll] ticket - 172 - clarify units of trickle timers
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On Mon, Aug 17, 2015 at 1:31 PM, Michael Richardson <mcr+ietf@sandelman.ca>
wrote:

>
> Kerry Lynn <kerlyn@ieee.org> wrote:
>     > peter van der Stok <stokcons@xs4all.nl> wrote:
>     >> It will be a nuisance if sets of nodes must be initialized with
>     >> different
>     >> Imin and Imax values to reach the same behaviour.
>     >> The same problem will occur when a YANG (SMIv2) description is
>     >> made for
>     >> managing these parameters.
>
>     > I think that we expect that Imax is in units of multiple of Imin,
>     > which
>     > is in units of TUNIT. Is that part at least, non-controversial?
>
>
>
>     > Imax is expressed as *doublings* of Imin, which is a tighter
>     > constraint than "multiple".
>     > It also represents an upper bound on the interval length.
>
> so, if the Imax field contains "5", does that mean that
>    Imax = 2^5 * Imin (* TUNIT)
>
> According to the example in Section 4.1 of RFC 6206, yes.  It refers
to "the amount of time specified by Imax" (which should probably have
its own name to avoid confusion).

Kerry


> --
> Michael Richardson <mcr+IETF@sandelman.ca>ca>, Sandelman Software Works
> IETF ROLL WG co-chair.    http://datatracker.ietf.org/wg/roll/charter/
>
>
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