[Roll] I-D Action: draft-ietf-roll-p2p-rpl-10 comments

[Federico Consoli <[e-mail]>]

Hi,
I disagree with the default value of trickle timer, especially for 
Imin=6 and K=1.
If you got a dense network it could lead to a very long time to build DAG.

Eg. Suppose you got 2 node A, B.
Node A got about 15-20 neighbor
Node B got only A as a neighbor.

When node A receive its first DIO it resets trickle to Imin and it 
starts trickle timer. Since A got a lot of neighbor its probably receive 
another consistent DIO so it will suppress the DIO message and it will 
increase its Imin to 7. So if node A suppress 6-8 times its DIO node B 
will receive it after a long time. Finally if the link A-B got an ETX of 
2 or 3 (or more) this time doubles.

These situations are not uncommon, especially in the routers at the edge 
of dense networks.

-- 
Regards
Consoli Federico