Subject: Re: [MBONED] I-D Action: draft-ietf-mboned-ieee802-mcast-problems-01.txt

From: "Morten V. Pedersen" <[email-masked]>
Date: Mon, 12 Mar 2018 16:59:51 +0100

Hi Mike and Charlie (and other co-authors),
I did a read though of the:

https://datatracker.ietf.org/doc/draft-ietf-mboned-ieee802-mcast-problems

I used this for the line numbers:
https://www.ietf.org/tools/idnits?url=https://www.ietf.org/archive/id/draft-ietf-mboned-ieee802-mcast-problems-01.txt

Line 31: performace -> performance

Line 509: Says that a DTIM of 3 means that the AP will send a multicast 
packet every 3 packets. I may be reading it wrong, but I do believe that 
it means that the AP will send multicast packets after every 3 beacon.

An additional item for section 3. Is air-time restrictions on multicast 
traffic. E.g. see this patch for the ath9k driver in Linux. It is 
effectively limiting the time which can be spent on sending multicast 
packets to 1/8'th of the beacon interval.
https://patchwork.kernel.org/patch/2687951/ This is a major problem for 
data intensive applications such as video delivery.

Thanks for you great work on creating some visibility on this problem.

All the best,
Morten

On 02/16/2018 08:40 PM, Mike McBride wrote:
> Please review this draft. Charlie and I are committed to update this 
> draft (hopefully with your comments) with the latest info on this 
> problem space. We will request time in London to have further 
> discussion. mboned is in a position to offer an important reference to 
> these problems while also sneaking in workarounds and recommendations 
> to ieee 802.
>
> There may be much more we can add to this document with your help. We 
> will likely add information about higher layer protocols (OPC-UA, DDS, 
> etc) that utilize multicast in their message bus which may be 
> transmitted over 802. There are industries which rely upon these 
> protocols and they could use this draft to help address wireless 
> transmission issues.
>
> thanks,
> mike
>
> On Sat, Feb 3, 2018 at 10:04 AM, <[email-masked] 
> <mailto:[email-masked]>> wrote:
>
>
>     A New Internet-Draft is available from the on-line Internet-Drafts
>     directories.
>     This draft is a work item of the MBONE Deployment WG of the IETF.
>
>             Title           : Multicast Considerations over IEEE 802
>     Wireless Media
>             Authors         : Charles E. Perkins
>                               Mike McBride
>                               Dorothy Stanley
>                               Warren Kumari
>                               Juan Carlos Zuniga
>             Filename        :
>     draft-ietf-mboned-ieee802-mcast-problems-01.txt
>             Pages           : 20
>             Date            : 2018-02-03
>
>     Abstract:
>        Well-known issues with multicast have prevented the deployment of
>        multicast in 802.11 [dot11], [mc-props], [mc-prob-stmt], and other
>        local-area wireless environments.  IETF multicast experts have been
>        meeting together to discuss these issues and provide IEEE updates.
>        The mboned working group is chartered to receive regular reports on
>        the current state of the deployment of multicast technology, create
>        "practice and experience" documents that capture the experience of
>        those who have deployed and are deploying various multicast
>        technologies, and provide feedback to other relevant working
>     groups.
>        This document offers guidance on known limitations and problems
>     with
>        wireless multicast.  Also described are various multicast
>     enhancement
>        features that have been specified at IETF and IEEE 802 for wireless
>        media, as well as some operational chioces that can be taken to
>        improve the performace of the network.  Finally, some
>     recommendations
>        are provided about the usage and combination of these features and
>        operational choices.
>
>
>     The IETF datatracker status page for this draft is:
>     https://datatracker.ietf.org/doc/draft-ietf-mboned-ieee802-mcast-problems/
>     <https://datatracker.ietf.org/doc/draft-ietf-mboned-ieee802-mcast-problems/>
>
>     There are also htmlized versions available at:
>     https://tools.ietf.org/html/draft-ietf-mboned-ieee802-mcast-problems-01
>     <https://tools.ietf.org/html/draft-ietf-mboned-ieee802-mcast-problems-01>
>     https://datatracker.ietf.org/doc/html/draft-ietf-mboned-ieee802-mcast-problems-01
>     <https://datatracker.ietf.org/doc/html/draft-ietf-mboned-ieee802-mcast-problems-01>
>
>     A diff from the previous version is available at:
>     https://www.ietf.org/rfcdiff?url2=draft-ietf-mboned-ieee802-mcast-problems-01
>     <https://www.ietf.org/rfcdiff?url2=draft-ietf-mboned-ieee802-mcast-problems-01>
>
>
>     Please note that it may take a couple of minutes from the time of
>     submission
>     until the htmlized version and diff are available at
>     tools.ietf.org <http://tools.ietf.org>.
>
>     Internet-Drafts are also available by anonymous FTP at:
>     ftp://ftp.ietf.org/internet-drafts/
>     <ftp://ftp.ietf.org/internet-drafts/>
>
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