All things related to multicast

[Bharat Joshi <>]

Hi Hitoshi,

     Thanks for you response. Please see my response in line.

Regards,
Bharat

> >* Do existing IGMPv3 capable applications support Exclude mode for ASM
>> groups?
>
>I don't think so.

Ok. So most of the times, applications will use one or multiple source 
addresses for ASM groups in INCLUDE mode.

>> * Also do anyone see a need for EXCUDE mode to be supported for their
>> existing applications or any new applications they will create or like
>> to use?
>
>I don't think there is necessity to use EXCLUDE mode for general
>multicast applications, except some service discovery protocols, which
>usually use (*,G). In other words, no use with source specific EXCLUDE
>mode join/leave.

So EXCLUDE mode is typically used to allow all and never with a source list.

>>      I just wanted to know on how much this complex functionality
>> ['Exclude Mode support'] being used in the field?
>
>I cannot imagine it'll be needed.
>
>In fact, eliminating EXCLUDE (S,G) join/leave is "beneficial" for
>multicast communications. For example, it reduces host/router/switch
>implementation costs and routing tree maintenance costs. It's not just
>"unneeded". This is my thought.

Ok. I am also of the same opinion.

So with above assumptions, it looks like an IGMPv3 host/router part 
implementation or IGMPv3 snooping which does not handle EXCLUDE with source 
list should be able to work in multicast networks.

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