Re: [Roll] New Version Notification - draft-ietf-roll-minrank-hysteresis-of-07.txt

[Philip Levis <[e-mail]>]

On Mar 16, 2012, at 1:44 PM, Matteo Paris wrote:

> 
> Hi Phil.  These changes were helpful.  But I am still unclear on the rank computation in section 3.3.  From the RPL draft:
> 
>  RPL Section 3.5.1:  "DAGRank(rank) = floor(rank/MinHopRankIncrease)"
>  RPL Section 3.5.1:  "A node A has a rank less than the rank of a node B if DAGRank(A) is less than DAGRank(B)."
>  RPL Section 3.5.2:  "[F]or a node N, all parents in the DODAG parent set must be of rank less than DAGRank(N)."
>  RPL Section 8.2.1:  "A node's rank MUST be greater than all elements of its DODAG parent set."
> 
> The rank computation in MRHOF section 3.3 can result in parents P for which DAGRank(P) is not less than DAGRank(N),
> which would seem to violate the third and fourth clauses above, given the definitions in the first two clauses.

How? I intended case 2 in 3.3 to cover this. Can you explain the edge case you see where it does not?

> 
> One other minor question.  In the sentence, "The second case covers requirement 4..." of MRHOF section 3.3, do you mean requirement 5?

Yes! It should be requirement 5. I will fix this in the next revision. Thank you for catching it.

Phil