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Re: [v6ops] IPv6 multicast WiFi power usage - draft-desmouceaux-ipv6-mcast-wifi-power-usage

"STARK, BARBARA H" <bs7652@att.com> Fri, 11 July 2014 16:14 UTC

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From: "STARK, BARBARA H" <bs7652@att.com>
To: Andrew Yourtchenko <ayourtch@cisco.com>, "v6ops@ietf.org" <v6ops@ietf.org>
Thread-Topic: [v6ops] IPv6 multicast WiFi power usage - draft-desmouceaux-ipv6-mcast-wifi-power-usage
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Date: Fri, 11 Jul 2014 16:13:41 +0000
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Cc: "ydesmouc@cisco.com" <ydesmouc@cisco.com>
Subject: Re: [v6ops] IPv6 multicast WiFi power usage - draft-desmouceaux-ipv6-mcast-wifi-power-usage
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Thanks for sharing. This is a very good thought-provoking paper, and I'm impressed with the research that was done.

An assumption I'd like to challenge is the one that putting multicast snooping on router/AP Wi-Fi interfaces is "costly in terms of resources and complexity for small systems like home boxes". I have some experience in requiring this of CE router vendors (it's absolutely required in CE routers that support IPTV services because we can't have huge multicast streams flooding the Wi-Fi connection when a single Wi-Fi device joins a stream). While other aspects of multicast handling have proven difficult to get right (IGMP proxy between WAN and LAN), the snooping on the Wi-Fi interface has not proven to be a problem. My personal suspicion is that "costly in terms of resources and complexity" is an excuse given by those who don't want to put in the effort to actually look into and do it. I also suspect that it would be holistically more cost-effective to put multicast snooping on router/AP Wi-Fi interfaces than to put the L2 multicast filter on all end devices (one of the options described in the paper).
Barbara

> -----Original Message-----
> From: v6ops [mailto:v6ops-bounces@ietf.org] On Behalf Of Andrew
> Yourtchenko
> Sent: Friday, July 11, 2014 9:16 AM
> To: v6ops@ietf.org
> Cc: ydesmouc@cisco.com
> Subject: [v6ops] IPv6 multicast WiFi power usage - draft-desmouceaux-ipv6-
> mcast-wifi-power-usage
> 
> hi all,
> 
> last IETF there were presentations about ND, multicast and power usage on
> the WiFi, the consensus was we need more data on it.
> 
> Yoann did a nontrivial amount of work on this subject in the meantime and
> we'd like to show it to you and hear your feedback.
> 
> http://tools.ietf.org/html/draft-desmouceaux-ipv6-mcast-wifi-power-
> usage-00
> 
> thanks a lot!
> 
> --a
> 
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