Re: IGMP Router Group Membership state

Hi Raja,

           The state after "No Response" is not bacause of 6.4.2 only. Apply
the fourth and fifth paragraph from "6.2.3 Definition of source timers"
also. You have received INCLUDE(A) and then EXCLUDE(A). Before stopping
forwarding for A you will want to know if there is any interest for A.
source-query for A is sent for that purpose. Here you are lowering the
source timer as well (check the v3Exp in source list). You do not receive
any response. So you stop the source timer and mark forwarding for that
source as negative(check Fwd in the source list). So you have achieved
To_EX(A). I hope this helps.

Thanks,
Indranil

On Mon, Jan 18, 2010 at 4:30 PM, rajasekar bonthala <
[email protected]> wrote:

> Hi All,
>
> Section 6.4.2 of RFC 3376 talks about on how should IGMP routers respond on
> receiving Filter Mode Change and Source List Change records.
>
> I do not get about what should be the action of the IGMP router in the
> following scenario.
>
> Router is in "INCLUDE A"  state. It receives a report "TO EXCLUDE A". Here,
> IGMP Router sends a Group and Source specific query for the source A group
> B.
>
> Let us say that IGMP Router receives a response "IS INCLUDE A".
>
> What should be the state of the IGMP Router before and after receiving
> response?
> What should be the state of the IGMP Router if it doesn't receive any
> response before the last member query time expires?
>
> In my IGMP Router I could see the state as below :
>
> BEFORE RESPONSE :
>
> atca-f120#show ip igmp groups detail
> Interface:      ge45
> Group:          224.0.6.130
> Uptime:         00:00:20
> Group mode:     Exclude (Expires: 00:06:22)
> Last reporter:  192.168.1.8
> Group source list: (R - Remote, M - SSM Mapping, S - Static)
> Include Source List :
>   Source Address  Uptime    v3 Exp    Fwd  Flags
>   10.10.10.10     00:00:20  00:00:27  Yes  R
>
>
>
>
> NO RESPONSE :
>
> atca-f120#show ip igmp groups detail
> Interface:      ge45
> Group:          224.0.6.130
> Uptime:         00:00:49
> Group mode:     Exclude (Expires: 00:05:53)
> Last reporter:  192.168.1.8
> Group source list: (R - Remote, M - SSM Mapping, S - Static)
> Exclude Source List :
>   Source Address  Uptime    v3 Exp    Fwd  Flags
>   10.10.10.10     00:00:49  stopped   No   R
>
>
> But could not interpret the above outputs. Can anyone help me.
>
> Thanks,
> RajaSekhar
>
>
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