Re: What is an IGMPv3 Router's initial current state for amulticast group?

Thanks for replying. You have answered my question based on the example I cited. But the question was more generic. What should the router consider as initial state when it has received the first report for a particular group. You have considered it to be INCLUDE(A), but there is no A when the router has not seen the group before, is it NULL then?

 

________________________________

From: Alvaro Fernandez [mailto:[email protected]] 
Sent: Wednesday, March 05, 2008 1:26 PM
To: Suvendu Mozumdar; [email protected]
Subject: RE: [magma] What is an IGMPv3 Router's initial current state for amulticast group?

 

Hi:

 

Initial state INCLUDE(A)

messaje TO_EX(B)

Final state EXCLUDE(A*B,B-A)

 

In the case B is "NULL" ( a empty list {} ) in the message, then the final state must be EXCLUDE({}, {}) and it doesn't matter which is the intial state. Both the requested list and the exclude list must be empty lists in the final state.

 

If the above is a litle difficult to understand is because, from my point of view, the requested list is a very bad solution to keep track of include sources when the filter mode is EXCLUDE. 

 

I think it would be a good idea to fix this in IGMPv4

 

Regards

 

Alvaro

 

________________________________

De: [email protected] en nombre de Suvendu Mozumdar
Enviado el: mié 05/03/2008 7:40
Para: [email protected]
Asunto: [magma] What is an IGMPv3 Router's initial current state for amulticast group?

Hi,
      I have a query regarding the IGMPv3/MLD Router behaviour. In IGMPv3/MLDv2, the action of a router on receiving a report message for a particular Group depends on the router's current state for the group at the time of receiving the report, as defined in section 6.4 of RFC 3376. Now what should be a router's initial current state for a group when it has received the first report for the group, lets say a router comes up afresh and receives the first report message for a group G1 with filter mode TO_EX(NULL). Now it has to consider some initial current state for the group and then based on that it has to take an action for the TO_EX(NULL) report. 

My question is what should be a router's initial current state for a group. I feel it should be INCLUDE(NULL), please advise.

-- 
Suvendu Mozumdar.
QA Architect.
Ixia Technologies Pvt. Ltd
9th Floor, Infinity Tower II
Sector V, Saltlake.
Kolkata 700091.
INDIA.
Mob : +919874081221

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