World IPv6 Only Day.
trejrco at gmail.com
Thu Jun 9 18:56:45 UTC 2011
On Thu, Jun 9, 2011 at 13:34, Ray Soucy <rps at 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.
More information about the NANOG