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Limiting multicast/broadcast traffic There is a desire to limit “unnecessary” multicast (and IPv4 broadcast) traffic, even when not dormant Any multicast traffic applications request is desired (not “unnecessary”) Broadcast and all-hosts-multicast may have unnecessary traffic For specific protocols (like ARP), it is possible to add intelligence to the BS and/or the bridge to do intelligent filtering All other multicast traffic already requires that the MS send explicit IGMP/MLD requests to indicate that it is necessary This includes for IPv6 ND IGMP snooping is already well known (RFC 4541) and widely implemented in switches Summary: IGMP/MLD is periodic, vs DAD is one-time IGMP/MLD works for all apps/protocols, DAD only works for one Recommendation: WG should investigate use of MLD snooping rather than other DAD optimizations for IPv6 |