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RE: MLD snooping of solicted-node multicast (Was: Re: New Version Notification for draft-halpern-6man-nd-pre-resolve-addr-00.txt

Dmitry Anipko <Dmitry.Anipko@microsoft.com> Fri, 17 January 2014 18:39 UTC

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From: Dmitry Anipko <Dmitry.Anipko@microsoft.com>
To: Lorenzo Colitti <lorenzo@google.com>, Ole Troan <otroan@employees.org>
Subject: RE: MLD snooping of solicted-node multicast (Was: Re: New Version Notification for draft-halpern-6man-nd-pre-resolve-addr-00.txt
Thread-Topic: MLD snooping of solicted-node multicast (Was: Re: New Version Notification for draft-halpern-6man-nd-pre-resolve-addr-00.txt
Thread-Index: AQHPDmY2hGYF66RRbk+N6Vv6p523J5qDMmwwgAATMeCABOYbYIAAiLsAgAABWYCAAJJtcA==
Date: Fri, 17 Jan 2014 18:39:15 +0000
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>> There are basically two solicited-node groups per host

Does this assume that typically there are only 2 non link-local IPv6 addresses  per host? (since different addresses are unlikely to fall in the same group, as long as they have different interface identifiers)

From: ipv6 [mailto:ipv6-bounces@ietf.org] On Behalf Of Lorenzo Colitti
Sent: Friday, January 17, 2014 1:49 AM
To: Ole Troan
Cc: Ing-Wher Chen; 6man WG
Subject: Re: MLD snooping of solicted-node multicast (Was: Re: New Version Notification for draft-halpern-6man-nd-pre-resolve-addr-00.txt

On Fri, Jan 17, 2014 at 1:43 AM, Ole Troan <otroan@employees.org<mailto:otroan@employees.org>> wrote:
I hear that MLD snooping for the solicited-node multicast groups isn't supported in most (if not all) switches.
partly because MLD snooping doesn't work well, but also because it becomes very costly to support state for this many multicast groups.

On wifi networks, I don't see why that would be. There are basically two solicited-node groups per host, and wifi access points already track lots of state on a per-MAC address basis.

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