By default, the size of the multicast cache is 32768 entries for IPv4 and 4096 entries for IPv6.
Router PIM configuration mode
If the max-mcache is changed to a value that is less than the current max-mcache value, the existing cache routes are not automatically deleted. The cache routes are deleted when new routes are added.
The no max-mcache form of the command restores the default size of the maximum multicast cache.
The following example changes the multicast cache to 500 entries for IPv4.
device(config)# router pim device(config-pim-router)# max-mcache 500
The following example changes the multicast cache to 500 entries for IPv6.
device(config)# ipv6 router pim device(config-ipv6-router-pim-vrf-default-vrf)# max-mcache 500