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(Optional) Configuring a Multicast Source Lifetime
Context
An IGMP proxy-capable router starts a timer for each (S, G) entry. A multicast source lifetime is the timeout period of an (S, G) entry generated by the IGMP proxy-capable router.
The IGMP proxy-capable router starts a timer upon receiving the first multicast data packet for group G from source S. The router resets the timer each time it receives a multicast packet sent from source S. If the router does not receive any multicast packet from source S within the lifetime of the source S, the router determines that source S has stopped sending multicast data to group G and the (S, G) entry has become invalid.