Re: [magma] IGMP Router Group Membership state

[rajasekar bonthala <[e-mail]>]

Bharat,

Thanks a lot for the reply.
In the first rule can you please explain on what is "EXCLUDE (A*B,B-A)" and
what is the meaning of action of the router i.e :-

 (B-A)=0
 Delete (A-B)
 Send Q(G,A*B)
 Group Timer=GMI

In the seconds rule can you explain me the meaning of "EXCLUDE (X+A,Y-A)"
and "(A)=GMI
"

You said that in the exclude mode, it maintains two lists, one is the
exclude list and the other is the include list. Is it that Exclude list to
inform about the blocked sources and Include list to inform the sources from
which the multicast packets are allowed. Am i correct.

Thanks,
RajaSekhar

On Mon, Jan 18, 2010 at 5:31 PM, Bharat Joshi <[e-mail]>wrote:

> Raja,
>
>        When the To_Ex(A) is received, router will change its mode to
> EXCLUDE. In exclude mode, it maintains two list. Following rule will apply:
>
>
>        INCLUDE (A)    TO_EX (B)    EXCLUDE (A*B,B-A)       (B-A)=0
>
>        Delete (A-B)
>
>        Send Q(G,A*B)
>
>        Group Timer=GMI
>
>         Now when router generates group-source specific query and it gets a
> response with IS_INC(A). Following rule will apply:
>
>         EXCLUDE (X,Y)  IS_IN (A)     EXCLUDE (X+A,Y-A)        (A)=GMI
>
>        The state as per this will be EXCLUDE mode with source 'A' in
> Include list and exclude list will now be empty.
>
>        Now if the response does not come, state will be EXCLUDE (A*B,B-A)
> which is an empty include list and source 'A' in exclude list.
>
> Thanks,
> Bharat
> ________________________________________
> From: [e-mail] [[e-mail]] On Behalf Of
> rajasekar bonthala [[e-mail]]
> Sent: Monday, January 18, 2010 4:30 PM
> To: [e-mail]; [e-mail]
> Subject: [magma] IGMP Router Group Membership state
>
> 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
>
>
> **************** CAUTION - Disclaimer *****************
> This e-mail contains PRIVILEGED AND CONFIDENTIAL INFORMATION intended
> solely
> for the use of the addressee(s). If you are not the intended recipient,
> please
> notify the sender by e-mail and delete the original message. Further, you
> are not
> to copy, disclose, or distribute this e-mail or its contents to any other
> person and
> any such actions are unlawful. This e-mail may contain viruses. Infosys has
> taken
> every reasonable precaution to minimize this risk, but is not liable for
> any damage
> you may sustain as a result of any virus in this e-mail. You should carry
> out your
> own virus checks before opening the e-mail or attachment. Infosys reserves
> the
> right to monitor and review the content of all messages sent to or from
> this e-mail
> address. Messages sent to or from this e-mail address may be stored on the
> Infosys e-mail system.
> ***INFOSYS******** End of Disclaimer ********INFOSYS***
>