4.6 Multicast Listener Discovery (MLD) for IPv6 - RFC2710
If an application is going to join any-source multicast group addresses, it SHOULD implement MLDv1. When MLD is used, the rules in "Source Address Selection for the Multicast Listener Discovery (MLD) Protocol" [RFC-3590] MUST be followed.
If I understand correctly, these nodes could support either MLDv1 or MLDv2.
The document already allows either MLDv1 or MLDv2 to be used. And yes, MLDv2 is backwards compatible to MLDv1 as John pointed out.
Perhaps the only question that I have left is... whether IPv6 nodes should support MLDv2 instead of MLDv1. The node requirements document and the MLDv2 draft intro gives the impression that the only difference is source-specific filtering. Then the current node reqs rules make sense. But Appendix B of the MLDv2 draft seems to list a number of other modifications, including some enhancements to robustness. Are these important? I'm not an expert enough to determine that.
I had suggested awhile back that MLDv2 should be the preferred choice for group management in the node requirements. At that time, MLDv2 was still being worked in the MAGMA WG so people didn't want to hold up this document on the MLDv2 spec.
The key advantage of MLDv2 is the source filtering ability. And with people talking/complaining about the lack of SSM support in v6 implementations, I think node reqs should lean heavier on MLDv2. There is no lack of traditional multicast capability since MLDv2 supports MLDv1 for backwards compatability.
The discussions in the MLDv2 appendix are helpful in understanding the changes in protocol behavior, but they aren't as important as the source filtering.
So, unless people want to re-open the discussion on what group management protocol should be put forth (which I don't, I am happy with what is there), I think the doc is fine.
Regards, Brian (without either chair hat on)
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