Re: When IBoE will be merged to upstream?

Roland Dreier
2010-07-15T20:03:42Z

> Small correction needed regarding the multicast forwarding.
> Since we are talking about IPv6 multicast groups, which translate to
> 33:33:xx:xx:xx:xx MAC address, the router listener notification protocol
> is going to be MLD and not IGMP. Still there are switches which support
> MLD forwarding to prevent the network flooding.

Well as I said the mapping of IBoE MGID to Ethernet address is not
specified. However I agree that using the same mapping as IPv6 so we
end up with 33:33:... addresses makes sense.

Yes, you are right that MLD snooping is the mechanism for switches to
discover IPv6 multicast group membership. However for the IBoE case
there is no requirement that IPv6 multicast group membership corresponds
in any way to the IBoE multicast group membership for the interface (and
indeed as far as I can tell from the IBoE spec, there is no requirement
that any IPv6 interface be configured on an IBoE port).

Furthermore, even if an IBoE interface sends MLD messages for a given
IPv6 group, there is no requirement that a switch use the membership
information for that group to forward multicast packets with a non-IPv6
ethertype.

- R.
--
Roland Dreier <rolandd-FYB4Gu1CFyUAvxtiuMwx3w@public.gmane.org> || For corporate legal information go to: