local multicast routing

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Say I have two multicast programs running on the same machine.  One
is a sending program, and one is a receiving program.  The receiving
program has joined the group to which the sender in sending.

How does the Linux kernel route these packets?  I.e., are the
packets just pushed out to the switch for routing, or is the kernel
smart enough to do some "local delivery" and directly deliver
packets to the listener?

Thank you,
Matt

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