IPv6 and multicast listener discovery

Fri Jun 4 22:23:19 UTC 2021

If you enable MLD snooping on your switches, the switch will block
multicast going out irrelevant ports. The idea is to reduce broadcast in a
broadcast domain.

On Fri, Jun 4, 2021 at 11:03 PM William Herrin <bill at herrin.us> wrote:

> Howdy,
>
> Question for those more versed in IPv6 than I: Is there any harm from
> dropping ICMPv6 multicast listener discovery reports in a network
> which does NOT use any multicast routing (i.e. only uses multicast
> which stays within the local link). I see a LOT of idle node chatter
> in the form of these reports which, of course, flood every station
> since they are themselves multicast. As far as I can tell they are
> used only to tell a multicast router whether to repeat a particular
> set of multicast packets to the instant link. Which in my network is
> -never- because there are no routed multicast packets to be repeated.
>
> Regards,
> Bill Herrin
>
> --
> William Herrin
> bill at herrin.us
> https://bill.herrin.us/
>
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