Re: [magma] Question about IGMPv3 state change

Indranil Bhattacharya <myselfindranil@gmail.com> Mon, 28 February 2011 13:25 UTC

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Date: Mon, 28 Feb 2011 18:56:31 +0530
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From: Indranil Bhattacharya <myselfindranil@gmail.com>
To: Kunal Shah <kunal.shah@ericsson.com>
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Subject: Re: [magma] Question about IGMPv3 state change
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Hi Kunal,


x = s1,s2
y= s3,s4
a=s2,s3

x+a = s1,s2,s3
y-a = s4
Does it answer your question?

Thanks,
Indranil


On Tue, Feb 15, 2011 at 1:28 AM, Kunal Shah <kunal.shah@ericsson.com> wrote:

>  Hi all,
>
> I have a question about IGMPv3 state machine. If a group is in EX(X,Y) and
> a TO_IN(A) is received, the new state according to the RFC is EX (X+A, Y-A).
> I think this mean remove all the elements of A from Y and add all elements
> of A to X. This also implies that sources not removed from Y will still end
> up being added to X. My question is why cant we add only those elemets of A
> to X which are removed from Y as opposed to adding all the elements of A to
> X ??
>
> If only the elements that are removed from Y are added to X, the new state
> would look like EX (X+(Y*A), Y-A).
>
> Am I missing something here??
>
> Kunal
>
>
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