Re: [Roll] How to react if Trickle Interval > Default Lifetime

Michael Richardson <mcr+ietf@sandelman.ca> Fri, 06 May 2016 13:41 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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Date: Fri, 06 May 2016 09:40:56 -0400
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Subject: Re: [Roll] How to react if Trickle Interval > Default Lifetime
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Joakim Eriksson <joakime@sics.se>; wrote:
    > Typically the RPL parent will get lots of data from the children which
    > will
    > cause the link-metric to change
    > so it is not always the case that a defunct parent (at least not any of
    > the
    > actively used ones) will be just

In many networks (metering for instance),  there can be very little traffic
for hours at a time, then a dozen packets down that part of the tree a few
times a day.

One answer that I like though: if there is no traffic, then it doesn't matter
if the routes are good or not.  The question is, when traffic does show up,
can we handle it in a timely fashion.

    > Yes, a regular unicast DIS is a good way to keep both link metrics and
    > other important liveliness
    > information up to date.

There is a document on unicast DIS.  Does it provide useful advice to you?

--
Michael Richardson <mcr+IETF@sandelman.ca>;, Sandelman Software Works
 -= IPv6 IoT consulting =-