Subject: [manet] Test: change in rute for an OLSR net

From: "Geir Gyland" <[email-masked]>
Date: Wed, 20 Nov 2002 13:41:41 +0100

Hi all!

We did some simple static test of route change using 4 nodes set up like
this:

      .  3   .
   .             .
1                   4
   .             .
      .  2   .

Node 1 and 4 are out of reach for each other (2 hops)

We generated CBR traffic with a speed of 11Mb/s (UDP) traffic and sent
it through the network. Initially the route was 1 - 3 - 4 then we
stopped the interface on node 3 and observed when the traffic started
passing over the route 1 - 2 - 4

I would have believed the route change to take 4 - 6 seconds (Neighbor
hold time + TC) but we observed twice as much time (between 12 and 15
sec) before the traffic was traveling over node 2.

Does anyone have an explanation to justify the time? 
 
At the moment we do not trust our results!

Additional information:
 
All nodes are laptops, running Red Hat 7.3 using the NLR (nolsrd)
modified version of the INRIA olsrd code version 1.0a9. 

OLSR parameters were set to the default values of the NRL version 
HELLO interval 0.5
HELLO multiplier 8
TC intereval 3
TC multiplier 5

-----------------------------
Geir Gyland
E-mail: [email-masked]

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