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

Andrew 👽 Yourtchenko <ayourtch@gmail.com> Wed, 22 July 2015 13:40 UTC

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Date: Wed, 22 Jul 2015 15:38:04 +0200
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To: Ole Troan <otroan@employees.org>
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Subject: Re: [v6ops] ref Hosts dont MLD to join LL groups
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On 22 Jul 2015, at 14:27, Ole Troan <otroan@employees.org>; wrote:

>> 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...

I hear similar, but in my interpretation they say this in the context of solicited node multicast groups, not in general about link-local groups.

OTOH it is easy to just flood link-local groups, right ? If so - getting rid of MLD seems like extra work to get something already possible ? (Also, adding complexity of dealing with the "pre" and "post" hosts)

--a


> 
> cheers,
> Ole
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