Hesham,
"Hesham Soliman (ERA)" wrote:
>
> Itojun,
>
> > >=> I've never seen that in any spec.
> > >I guess you are saying that it's needed for L2
> > >switches that snoop MLD messages to decide
> > >on mcast forwarding of mcast ethernet frames?
> > >
> > >If so, then we don't have this situation in
> > >cellular networks. What we're dealing with is
> > >a p2p link with no multicast capability.
> >
> > even under the above situation, there's no such clause
> > that permits
> > omission of MLD in RFC2710 (MLD). if you have any
> > reference please
> > let me know, i'm interested in knowing the rationale
> > for the claim.
>
> => I don't understant :(. RFC2710 does not say that
> MLD MUST be implemented in all IPv6 nodes. There is
> no statement in any IPv6 document that says anything
> equivalent. So our interpretation is that it is not
> mandatory, it's optional. I don't think that the lack
> of a clear statement saying 'MLD is mandatory' should
> imply that it is mandatory. Mandated protocols are
> clearly stated in their respective RFCs (e.g. ICMPv6).
>
> So when is MLD needed? I will copy a paragraph from
> the intro of 2710:
>
> "The purpose of Multicast Listener Discovery (MLD) is to enable each
> IPv6 router to discover the presence of multicast listeners (that is,
> --------------------------------------------
> nodes wishing to receive multicast packets) on its directly attached
> links, and to discover specifically which multicast addresses are of
> interest to those neighboring nodes. This information is then
> provided to whichever multicast routing protocol is being used by the
> router, in order to ensure that multicast packets are delivered to
> all links where there are interested receivers."
Take a look at the very last paragraph of section 5 of 2710. It
states:
MLD messages ARE sent for multicast addresses whose scope is 2
(link-local), including Solicited-Node multicast addresses [ADDR-
ARCH], except for the link-scope, all-nodes address (FF02::1).
That means that a host MUST send an MLD Report for all multicast
groups it joins except all-nodes.
Brian
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