[Roll] Clarification: Stale DAO

["Mathilde Durvy (mdurvy)" <mdurvy at cisco.com>]

Hi All,

 

I need some clarification on the paragraph below:

   The sequence counter is incremented by the source of the DAO message (the
   node that owns the prefix, or learned the prefix via some other
   means), each time it issues a DAO message for its prefix....

   Further, if the DAO message appears to be out of synch (the sequence
   counter is 2 or more behind the present value) then the DAO state is
   considered to be stale and may be purged, and the DAO message is
   discarded.

 

It seems to me that out of synch DAO message can only happen if a node receives DAO message for the same prefix from two different children (note that this implies multiple DA parents).

 

If that is the case it means that the node should remove the route going through the child advertising the prefix with a stale sequence number (and keep the more up-to-date route via the other child)

 

Is my reasoning correct?

 

Best,

Mathilde

 

 

Durvy Mathilde Software Engineer Technology center mdurvy at cisco.com Phone: +41 21 822 1725 Mobile: +41 76 396 8116	Cisco Systems International Sàrl Av. des Uttins, 5 CH-1180 Rolle Cisco home page

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