Subject: Regarding to RFC 3810: Multicast Address and Source Specific Query

From: "Yu-Jung Lee" <[email-masked]>
Date: Mon, 13 Mar 2006 18:37:08 +0800

Hi, 

Through RFC 3810, it is said under two conditions that a Multicast Address and Source Specific Query would be sent. 

1. When a node in INCLUDE mode expresses its desire to stop listening to a specific source, all the multicast routers on the link lower their timers for that source to a given value.  The Querier then sends a Multicast Address and Source Specific Query, to verify whether there are other listeners for that source on the link, or not.

2. The router has to maintain the Requested List to to allow the fast blocking of previously unblocked sources.  If the router receives a report that contains such a request, the concerned sources are added to the Requested List.  Their timers are set to a given small value, and a Multicast Address and Source Specific Query is sent by the Querier, to check whether there are nodes on the link still interested in those sources, or not. 

I'm wondering if they are the only two situations that the querier would send out Multicast Address and Source Specific Query?  Do the queriers send out Multicast Address and Source Specific Queries only when they receives MLDv2 reports with "Block Old Source" record type? What are queriers supposed to do if they receive a report (m, EXCLUDE, {NULL}) then a report (m, EXCLUDE, {A, B})? Should they send out Multicast Address and Source Specific Query to verify whether there are nodes on the link interested in sources A and B, or not?  

Best Regards,

Jessie
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