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Re: [dhcwg] MPL config draft (Re: [Roll] I-D Action: draft-ietf-roll-mpl-parameter-configuration-01.txt)

"Bernie Volz (volz)" <volz@cisco.com> Mon, 07 July 2014 17:19 UTC

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From: "Bernie Volz (volz)" <volz@cisco.com>
To: Andre Kostur <akostur@incognito.com>, Yusuke DOI <yusuke.doi@toshiba.co.jp>
Thread-Topic: [dhcwg] MPL config draft (Re: [Roll] I-D Action: draft-ietf-roll-mpl-parameter-configuration-01.txt)
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Date: Mon, 07 Jul 2014 17:19:11 +0000
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Cc: "dhcwg@ietf.org" <dhcwg@ietf.org>, Routing Over Low power and Lossy networks <roll@ietf.org>
Subject: Re: [dhcwg] MPL config draft (Re: [Roll] I-D Action: draft-ietf-roll-mpl-parameter-configuration-01.txt)
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Hi:

Not sure I'd suggest adding 10 (or 11) options for this?

But I certainly would suggest, as Andre did, much simpler values - flags and "compressed" data just make for much more complex and error prone processing on both client and server. A structure which would have all these values but in a much more standard set of data formats would be better.

Perhaps there is a middle grown to have groups of values (i.e., have 3-4 options)? I'm really not that familiar with MPL, but perhaps there are some logical groupings that make sense (seems that there are data and control messages would could be one logical separation).

Might also be nice in the Abstract to define MPL? 

- Bernie

-----Original Message-----
From: dhcwg [mailto:dhcwg-bounces@ietf.org] On Behalf Of Andre Kostur
Sent: Monday, July 07, 2014 12:32 PM
To: Yusuke DOI
Cc: dhcwg@ietf.org; Routing Over Low power and Lossy networks
Subject: Re: [dhcwg] MPL config draft (Re: [Roll] I-D Action: draft-ietf-roll-mpl-parameter-configuration-01.txt)

A couple of quick thoughts (keeping in mind RFC 7227 - Guidelines for Creating New DHCPv6 Options):

- An encoded option is frowned upon.  Split all of those into separate options, and the "Reserved" parts simply disappear.  A "sub-optioned"
option is also frowned upon (section 9, RFC 7227).
- Why add the additional complexity of the floating point?   Why not
use a 32-bit unsigned integer representing milliseconds which gets you a little over 40 days?  Not the 18 weeks that you currently can represent, but is there a practical use for timers over a month long in MPL?
- If you do go with separate options, consider what it would mean if certain options don't exist.  ietf-roll-trickle-mcast appears to define defaults, perhaps reference that draft to say that if an option is missing, the client is to use the default defined in that draft?
- Speaking of RFC 7227...  I-D.ietf-dhc-option-guidelines got published in May

--
Andre Kostur

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