Re: When IGMPv3 router in EXCLUDE(X,Y) state

There's a single elected querier per subnet, with non-elected routers  
ceasing to send queries. The notation Q(G) and Q(G,A) therefore  
describes Group-Specific and Group-and-Source-Specific queries (a)  
sent by the single elected querier OR (b) received by non-elected  
routers. The non-elected routers need both Group-Specific and Group- 
and-Source-Specific queries to update both their Source timers and  
their Group timer, respectively. See 6.6.1.

Rather, the protocol for Group Members handles merging pending  
responses to Group-Specific and Group-and-Source-Specific queries. See  
5.2.

On Mar 12, 2008, at 10:53 PM, ravikumar vj wrote:

> Hi,
>      What is the need of sending 2 queries? Send Q(G,X-A) and Send  
> Q(G).
> Instead, cant we update the timer for (X-A) to LMQT and just send a  
> group specific query alone?
>
> Regards
> Ravikumar V J
>
>
> [email protected] wrote:
> Send magma mailing list submissions to
> [email protected]
>
> To subscribe or unsubscribe via the World Wide Web, visit
> https://www.ietf.org/mailman/listinfo/magma
> or, via email, send a message with subject or body 'help' to
> [email protected]
>
> You can reach the person managing the list at
> [email protected]
>
> When replying, please edit your Subject line so it is more specific
> than "Re: Contents of magma digest..."
>
>
> Today's Topics:
>
> 1. When IGMPv3 router in EXCLUDE(X, Y) state receives TO_IN(A)
> (Rohan Sen)
> 2. Re: When IGMPv3 router in EXCLUDE(X, Y) state receives
> TO_IN(A) (Mark Fine)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Wed, 12 Mar 2008 15:16:45 +0530
> From: "Rohan Sen"
> Subject: [magma] When IGMPv3 router in EXCLUDE(X, Y) state receives
> TO_IN(A)
> To: [email protected]
> Message-ID:
> <[email protected]>
> Content-Type: text/plain; charset="iso-8859-1"
>
> Hi,
>
> RFC 3376 Section 6.4.2 change state record handling router state  
> machine
> last line mentions about sending a group specific query in addition  
> to the
> source specific query.
> I am not very sure if I am able to understand the necessity of this  
> group
> specific query. Usually a TO_IN(A) message is received from a host  
> that
> underwent a state change from EXCLUDE(A) to INCLUDE(A) which means the
> router already had a state of EXCLUDE(X,Y) where A is a subset of Y.  
> The
> router then tries to find out if there is any host which still has  
> interest
> in receiving traffic for the sources already having source timer >  
> 0. I do
> not understand what is the use of sending a group specific query in  
> this
> case since the group specific query has a wider scoped purpose than  
> the
> source specific query.
>
> Could it be that since for other cases no query is sent if sources  
> to be
> queried is NULL set, for this case only (since TO_IN(NULL) is the  
> IGMPv3
> translation for IGMPv2 Leave when older version host for that group is
> present) a group specific query has to be sent regardless of whether  
> the to
> be queried source set is NULL or not.
>
> Any help on these lines would be highly appreciated.
>
> -- 
> thanks,
> Rohan Sen
> -------------- next part --------------
> An HTML attachment was scrubbed...
> URL: http://www.ietf.org/pipermail/magma/attachments/20080312/39d7ef63/attachment.htm
>
> ------------------------------
>
> Message: 2
> Date: Wed, 12 Mar 2008 11:03:48 -0700
> From: Mark Fine
> Subject: Re: [magma] When IGMPv3 router in EXCLUDE(X, Y) state
> receives TO_IN(A)
> To: "Rohan Sen"
> Cc: [email protected]
> Message-ID:
> Content-Type: text/plain; charset=US-ASCII; format=flowed; delsp=yes
>
> The Group-Specific query is to find out if there are any hosts which
> still have EXCLUDE state -- the Group-Specific query will lower the
> router's Group Timer to LMQT, and if no hosts respond with IS_EX
> Current-State records, the Group Record will switch to INCLUDE filter-
> mode if there are still Source Records with timers running.
>
> On Mar 12, 2008, at 2:46 AM, Rohan Sen wrote:
>
> > Hi,
> >
> > RFC 3376 Section 6.4.2 change state record handling router state
> > machine last line mentions about sending a group specific query in
> > addition to the source specific query.
> > I am not very sure if I am able to understand the necessity of this
> > group specific query. Usually a TO_IN(A) message is received from a
> > host that underwent a state change from EXCLUDE(A) to INCLUDE(A)
> > which means the router already had a state of EXCLUDE(X,Y) where A
> > is a subset of Y. The router then tries to find out if there is any
> > host which still has interest in receiving traffic for the sources
> > already having source timer > 0. I do not understand what is the use
> > of sending a group specific query in this case since the group
> > specific query has a wider scoped purpose than the source specific
> > query.
> >
> > Could it be that since for other cases no query is sent if sources
> > to be queried is NULL set, for this case only (since TO_IN(NULL) is
> > the IGMPv3 translation for IGMPv2 Leave when older version host for
> > that group is present) a group specific query has to be sent
> > regardless of whether the to be queried source set is NULL or not.
> >
> > Any help on these lines would be highly appreciated.
> >
> > --
> > thanks,
> > Rohan Sen _______________________________________________
> > magma mailing list
> > [email protected]
> > https://www.ietf.org/mailman/listinfo/magma
>
>
>
> ------------------------------
>
> _______________________________________________
> magma mailing list
> [email protected]
> https://www.ietf.org/mailman/listinfo/magma
>
>
> End of magma Digest, Vol 44, Issue 7
> ************************************
>
>
> Looking for last minute shopping deals? Find them fast with Yahoo!  
> Search._______________________________________________
> magma mailing list
> [email protected]
> https://www.ietf.org/mailman/listinfo/magma