Subject: Re: [manet] review of draft-dearlove-manet-olsrv2-rmpr-optimization-00

From: "Dearlove, Christopher (UK)" <[email-masked]>
Date: Fri, 3 Jan 2014 10:24:59 +0000

I failed to respond to this earlier, but my files have the unpublished RFC 6966 as having the changed title (starting with "Rationale") compared to the -04 draft, I presume (my recollection is incomplete) at the request of the RFC Editor. Thus I believe the reference is actually correct, but we can confirm that when RFC 6966 is published.

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Christopher Dearlove
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From: [email-masked] [mailto:[email-masked]] On Behalf Of Jiazi Yi
Sent: 11 November 2013 11:15
To: MANET IETF
Subject: Re: [manet] review of draft-dearlove-manet-olsrv2-rmpr-optimization-00

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And one nit:

In the reference, we have

   [RFC6966-to-be]
              Clausen, T., Dearlove, C., and P. Jacquet, "Rationale for
              the Use of Link Metrics in the Optimized Link State
              Routing Protocol Version 2 (OLSRv2)", RFC 6966, TBD 2013.

I suppose the name of the draft is

  Link Metrics for the Mobile Ad Hoc Network (MANET) Routing Protocol OLSRv2 - Rationale

http://tools.ietf.org/html/draft-ietf-manet-olsrv2-metrics-rationale-04 ?

Jiazi

Jiazi Yi<mailto:[email-masked]>
11 Nov 2013 12:12
Hi,

I had a review of draft-dearlove-manet-olsrv2-rmpr-optimization-00. Here are some comments (or some of them, I would rather call questions :)

1. In Section 4: Routing MPR Selection
...
then x_1 to x_n may be removed from the set of routing MPRs, if selected.
...

The first note: I think we should use RFC2119 term "MAY" here?
In fact, this is the part that confuses me most. As the only "action" described in the draft, the use of "may" without further explanation when this action should be taken or not is too vague. In the end of the section, another "RECOMMENDED" is used. Therefore, if I put them together, it is something like "It is RECOMMENDED that one MAY do foo, bar..."

2.  If x_1, x_2 ... x_n are the largest set with corresponding y_1, y_2, ... y_n. Should we check all the subsets {x_i} of x_1, ... x_n with the criteria

d1(x_0) + d2(x_0,y_1) + ... + d2(x_m-1,y_m) < d1(x_m) for m belong to subset of x_1, ... x_n?

If so, we probably will have a lot combinations to check in a dense network. If not, the criteria seems to be too harsh to be actually "triggered"?

3. Should this be applied to all types of metrics? A potential affects of this draft is that, we can probably have more "hops" around the neighborhood of the original router, i.e., there is higher possibility of interference. In some of metrics, the interference is not much considered (because it is hard to measure). Will it be a problem if we introduce more transmission in some scenarios?

4. We have a "Willingness" value to "represents the router's willingness to be selected as an MPR." Should this need to be considered also? What about if x_0 has low willingness, while the others x_1, ... x_n have higher willingness?

5. In some scenarios, we probably want to have certain redundancy in MPR in some lossy scenarios?

sincerely

Jiazi

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