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

Michael Richardson <mcr+ietf@sandelman.ca> Mon, 24 August 2015 00:04 UTC

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From: Michael Richardson <mcr+ietf@sandelman.ca>
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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Kerry Lynn <kerlyn@ieee.org> 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)

    kerry> According to the example in Section 4.1 of RFC 6206, yes. It refers
    kerry> to "the amount of time specified by Imax" (which should probably have
    kerry> its own name to avoid confusion).

I'd like the DHCP parameter document to more closely refer to this, and
perhaps even copy the example from 6206 then.

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