Subject: Re: Reflects on AODV

From: Elizabeth Royer <[email-masked]>
Date: Tue, 15 Aug 2000 09:42:22 -0700 (PDT)

Hello Manel,

We have found that a jitter value of +/- 12% works pretty
well (10% would probably also work well).  You are correct 
in that the number of collisions is greatly reduced.  
This also helps prevent synchronization of the nodes.  
+/- 50% is too large in that you are reducing the number
of Hellos you could potentially receive during the HELLO_INTERVAL,
and hence you may have less accurate neighbor information.

Perhaps we should add this recommendation into the draft.

Regards,
Elizabeth

~> Anyway, lately I've been thinking and talking about
~> different isues AODV related. And maybe you could tell
~> me if you have any feelings about them.
~> 
~> o One of them is what do you think about the use of
~>   a jitter in the hello messages.
~>   I haven't seen a manet protocol with jitter. RIP
~>   implementations use it and I think it could be
~>   interesting to consider to use it in AODV.
~>   For me there are two reasons for using it:
~>   - It reduces collisions. (So this is only for those
~>     systems that do not solve collisions with some MAC)
~>   - It also reduces temporally network congestion dued
~>     to actuallizations in cascade.
~> 
~>   It is hard to know the best value in each situation,
~>   but I bet the intuitive value of +/- 50% will do fine.
~> 
~>   I don't know. Maybe there are some good reasons for
~>   not using jitter in AODV and other manet prots.