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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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