Re: [Roll] [roll] #86: G flag: do we need that text?

[Michael Richardson <[e-mail]>]

I think we need to determine what a grounded DODAG is.
Does it mean that a node announcing such a thing is attached to the Internet? (In which case P2P usage should G=0)
Or does it mean that a node is attached to the resource named in the DIO? (In which case origin P2P should G=1)


Richard Kelsey <[e-mail]> wrote:

>> Date: Wed, 4 Apr 2012 08:54:52 -0500
>> From: Mukul Goyal <[e-mail]>
>> 
>> >The G flag is 0 if and only if the DODAG is floating.
>> 
>> I think that the G flag is 1 if and only if the DODAG is grounded.
>
>I agree.  G = 0 means floating, G = 1 means grounded.
>
>> The temporary DAGs used in P2P-RPL are not grounded, they are
>> temporary. I think that all transient/temporary DAGs are
>> floating by their very nature.
>
>This I don't follow at all.  If a device has a temporary need to
>send or receive data from many other devices, it makes perfect
>sense for it to create a a temporary, grounded DODAG.  If there
>is a lot of P2P traffic, it makes perfect sense to have permanent,
>floating DODAGs for routing that traffic.  
>
>                                         -Richard Kelsey
>
>> ----- Original Message -----
>> From: "Richard Kelsey" <[e-mail]>
>> To: [e-mail]
>> Cc: [e-mail], [e-mail], [e-mail]
>> Sent: Wednesday, April 4, 2012 8:36:50 AM
>> Subject: Re: [Roll] [roll] #86: G flag: do we need that text?
>> 
>> > From: roll issue tracker <[e-mail]>
>> > Date: Wed, 4 Apr 2012 13:08:50 +0000
>> > 
>> > #86: G flag: do we need that text?
>> > 
>> >  Problem (resolition is proposed)
>> >  ------------------------------
>> >  Disagreement on the meaning of 'G' bit and imposed setting to 0;
>> > 
>> >  Proposed resolution
>> >  ---------------------------
>> >  The origin sets the G flag based on its perception of whether joining
>> >  how the flag's value would affect the rank calculation under the OF
>> >  being used. By default, the G flag is set to zero given the temporary
>> >  nature of the DAG being created.
>> 
>> I disagree with the proposed resolution.  It adds needless
>> confusion.  The G flag is 0 if and only if the DODAG is floating.
>> There is no point to allowing floating DODAGs with a P2P-RDO
>> option.  I suggest that the G bit be set to 1 and that routers be
>> explicitly prohibited from creating floating DODAGs with a
>> P2P-RDO option.
>>                                    -Richard Kelsey
>> 
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