[Roll] Loop Free DODAG Repair Solution

[Jianlin Guo <[e-mail]>]

Hi everyone,

We have proposed a loop free DODAG repair solution. Our DODAG repair 
mechanism does not increase rank, and therefore, it does not create any 
loop.Our solution works for both storing mode and non-storing mode of RPL.

To repair DODAG, a node multicast a repair request (REQ) message. Upon 
receiving a REQ message, a neighboring node generates a repair response 
(REP) message if it has a smaller rank. Otherwise, neighboring node 
forwards REQ message to a parent. DODAG is repaired when repair 
initiation node receives a REP message. The detailed DODAG repair 
mechanism is specified in draft-guo-roll-loop-free-rpl-00.

Even though draft-guo-roll-loop-free-rpl-00 defines an alternative rank 
(fraction rank), which is used to describe the DODAG repair mechanism, 
proposed solution works for integer rank as well.

Please review draft-guo-roll-loop-free-rol-00 and provide us with 
comments and feedback.

Regards,
Jianlin Guo
Mitsubishi Electric Research Labs