Re: [Roll] Clarification on the objective function

["Julien Abeille (jabeille)" <jabeille at cisco.com>]

Phil, 

Are you in favor of computing rank based on all parents, or only
preferred?

Julien

> -----Original Message-----
> From: Philip Levis [mailto:pal at cs.stanford.edu] 
> Sent: lundi 9 novembre 2009 18:00
> To: Julien Abeille (jabeille)
> Cc: Pascal Thubert (pthubert); JP Vasseur (jvasseur); 
> Mathilde Durvy (mdurvy); roll
> Subject: Re: [Roll] Clarification on the objective function
> 
> 
> On Nov 9, 2009, at 4:57 AM, Julien Abeille (jabeille) wrote:
> 
> > Hi Pascal,
> >
> > just to be sure I understand:
> > - I have a preferred parent at rank 1, my rank is 5, I 
> receive a DIO 
> > for a parent rank 2, must i ignore it? I would say no as 
> this node is 
> > useful as backup parent, but if i lose my preferred parent, 
> choosing 
> > the backup as preferred will make my rank increase (this is 
> ok because 
> > if i compute rank based on all parents, I would have to 
> increase rank 
> > at reception of the second DIO anyway)
> > - At boot time, I receive two DIOs (rank 1 and 2) before computing 
> > OCP. If I calculate rank based on preferred only, if at 
> some point I 
> > would like to switch to the other parent, I will have to move down.
> >
> > Still I think it is preferable to calculate rank based on preferred 
> > only, but what do other think?
> > Julien
> 
> Julien,
> 
> Question 1: In -04, you MUST process the DIO. Section 5.4.2.1:
> 
> 	If the rank of SRC as reported in the DIO message is lesser
>          than that of the node within the DAG, then the DIO 
> message MUST
>          be considered for further processing
> 
> Question 2: The draft is unclear.
> 
> Phil
>