Re: [v6ops] ref Hosts dont MLD to join LL groups

Ole Troan <otroan@employees.org> Wed, 22 July 2015 12:27 UTC

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From: Ole Troan <otroan@employees.org>
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Date: Wed, 22 Jul 2015 14:27:42 +0200
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To: Alexandru Petrescu <alexandru.petrescu@gmail.com>
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Subject: Re: [v6ops] ref Hosts dont MLD to join LL groups
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> Regarding the mic discussion about unicast RAs a SHOULD.
> 
> I have been directed that the reference saying that Hosts dont MLD to join multicast groups is RFC3810:
> 
> "  The link-scope all-nodes multicast address, (FF02::1), is handled as
>   a special case.  On all nodes -- that is all hosts and routers,
>   including multicast routers -- listening to packets destined to the
>   all-nodes multicast address, from all sources, is permanently enabled
>   on all interfaces on which multicast listening is supported.  No MLD
>   messages are ever sent regarding neither the link-scope all-nodes
>   multicast address, nor any multicast address of scope 0 (reserved) or
>   1 (node-local).”

I do wonder if we should expand that exception to all link-scope multicast addresses.

the bridge implementors I speak to tell me that they don’t have enough state to do MLD snooping for link-local scoped multicast addresses anyway...

cheers,
Ole