On Thu, Jun 9, 2011 at 13:34, Ray Soucy <[email protected]> wrote: > Cisco has had MLD snooping support for some time. But they seem to > have broken it in a recent release, so it drops ND traffic and breaks > IPv6; been after them to fix it, but doesn't look like it's been > resolved yet. > > But you're correct that without MLD snooping IPv6 ND traffic is on par > with IPv4 broadcast traffic and not a major problem. <snip> >
While I certainly agree it is not a major problem, it should be _even less_ of a problem than ARP. Yes, the non-MLD-snooping switch forwards all multicast to every port - but the other end of those cables (the nodes plugged in to the switch) don't need to process the frame at all - not listening for that MAC. Compared to ARP, where the frame is picked up and handed to layer3/IPv4 before being discarded. /TJ
