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

Correct, similar to the specification for Interface State:

5.1. Action on Change of Interface State

           << snip >>

                                                                                  If
  no interface
    state existed for that multicast address before the change (i.e.,  
the
    change consisted of creating a new per-interface record), or if no
    state exists after the change (i.e., the change consisted of  
deleting
    a per-interface record), then the "non-existent" state is considered
    to have a filter mode of INCLUDE and an empty source list.

On Mar 4, 2008, at 10:40 PM, Suvendu Mozumdar wrote:

> 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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