On Thu, Jun 9, 2011 at 13:34, Ray Soucy <rps@maine.edu> 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