[Tinyos-help] MultiHopLEPSM query

[Omprakash Gnawali]

On Thu, Jul 23, 2009 at 10:52 AM, bharat naik<bharat.2511 at gmail.com> wrote:
> Hi,
>
>      Is there any way in which a parent can know if its child has failed?
> What should the modification to MultiHopLEPSM be?
>      Also, during a simulation, I was failing node  'x' at time 0:5:58.
> (using Tython). However, even after this, it was being chosen as parent by
> nodes 'y' and 'z'. What can be the reason, since it surely can't send any
> HELLO packets after being failed? Also, it wasn't as if nodes 'y' and 'z'
> didn't have any other options.

Those protocols take time to detect that a node has failed. If a node
does not hear a HELLO mesasge that could be due to node failure or
lossy link. So a node has to wait long enough. Protocols like CTP rely
on datapath estimate and can detect these failures quickly.

- om_p