How does an S series switch age Layer 3 multicast entries

PIM deletes a Layer 3 multicast entry when the following conditions are met:
- No traffic matches the entry. The multicast FIB management module counts packets matching each Layer 3 multicast entry. If no packet matches an entry within 210 seconds, the multicast FIB management module sends an entry inactive message to the PIM module.
- The outbound interface list of the entry does not contain any outbound interface learned from PIM Join messages or PIM Prune messages. The outbound interfaces learned from IGMP on the designated router (DR) do not affect aging of Layer 3 multicast entries.
If all the preceding conditions are met, PIM considers the entry invalid and deletes it.

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