Re: [manet] Magnus Westerlund's Discuss on draft-ietf-manet-dlep-pause-extension-06: (with DISCUSS)

Lou Berger <lberger@labn.net> Thu, 04 April 2019 15:56 UTC

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To: Magnus Westerlund <magnus.westerlund@ericsson.com>, The IESG <iesg@ietf.org>
Cc: draft-ietf-manet-dlep-pause-extension@ietf.org, manet@ietf.org, manet-chairs@ietf.org
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From: Lou Berger <lberger@labn.net>
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Date: Thu, 4 Apr 2019 11:56:50 -0400
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Subject: Re: [manet] Magnus Westerlund's Discuss on draft-ietf-manet-dlep-pause-extension-06: (with DISCUSS)
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Hi,

On 4/4/2019 7:42 AM, Magnus Westerlund via Datatracker wrote:
> Magnus Westerlund has entered the following ballot position for
> draft-ietf-manet-dlep-pause-extension-06: Discuss
>
> When responding, please keep the subject line intact and reply to all
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> introductory paragraph, however.)
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>
> Please refer to https://www.ietf.org/iesg/statement/discuss-criteria.html
> for more information about IESG DISCUSS and COMMENT positions.
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>
> The document, along with other ballot positions, can be found here:
> https://datatracker.ietf.org/doc/draft-ietf-manet-dlep-pause-extension/
>
>
>
> ----------------------------------------------------------------------
> DISCUSS:
> ----------------------------------------------------------------------
>
> It is unclear to me what the purpose of the pause and resume is here?
>
> Is it to enable the router to build the queue rather than the modem if there is
> a queue buildup in the modem?

Yes and also allow a router to implement more sophisticated queuing if 
it so chooses, e.g., mapping multiple DHCPs into a single modem queue.

>   If that is the case, then pause and resume will
> be done frequently and on short time scales due to variability of the link. And
> then the router resumes transmission to the modem when the buffer has been
> reduced?

Also correct.  Fundamentally this is the same as what was defined 
previously for PPPoE in RFC5578, but using a simpler on/off mechanism 
and DLEP.  DLEP is the replacement for using PPPoE for radio to router 
information.

> As this is enabled to be done on a queue level what how does one
> ensure the per hop behavior that is intended based on the DSCP with this split.
> Because you will get an interaction between the two queue that are in series
> for the same link which makes ensuring the PHB difficult.

I agree that there are two queues in series, but don't see this as 
materially different than what RFC5578 allowed or 2 routers 
interconnected over a link that supports normal Ethernet pause or PFC.  
In other words, I see that a modem that is DSCP aware must conform with 
the same requirements as a router that is DSCP aware.

At least this is my option.  Others may see it differently, e.g., Stan 
(who co-authored RFC5578 and is the doc Shepherd) or the others in the 
WG who have been working radio/router interfaces for far longer than I 
have...

Lou

> I hope for a timely clarification to determine if this is a discuss or not and
> make it more actionable.
>
>
>
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