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

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


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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
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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



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