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"Jerald" == Jerald P Martocci <Jerald.P.Martocci at jci.com> writes:
Jerald> I agree with Julien that we need a DIO solicitation message
Jerald> (i.e. DIS) since as he says a packet can't wait around for
Jerald> hours waiting for a new DAG parent. I buy that and agree
Jerald> with it. However, I am a bit confused why a multicast DIS
Jerald> should trigger a multicast DIO. This seems to simply add
Jerald> unnecessary packets onto the network.
I am reacting to the last sentence.
I'd have thought that multicast avoids unncesary packets!!!!
So perhaps we are not talking about the same thing?
Maybe we need better terminology.
I think that there are three kinds of transmission:
a) unicast
b) link-level multicast
c) subnet-level multicast
On ethernet, (b) and (c) are the same thing.
On 6lowpan-type networks, I think (b) is what happens when you
transmit to the nodes that can hear you, and (c) is what you do via a
whiteboard or multicast relay.
(Maybe there are accepted terms for this, of which I am ignorant)
Only transmissions of type (c) cause more packets on the wire.
Transmissions of type (b) would save packets, because one message
arrives at many receivers at the same time. Maybe (b) causes
receivers
that would otherwise have been happy to sleep (doze?) to wake up.
- --
] He who is tired of Weird Al is tired of life! |
firewalls [
] Michael Richardson, Sandelman Software Works, Ottawa, ON |net
architect[
] mcr at sandelman.ottawa.on.ca http://www.sandelman.ottawa.on.ca/ |
device driver[
Kyoto Plus: watch the video <http://www.youtube.com/watch?v=kzx1ycLXQSE
>
then sign the petition.
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