IP multicast filters

IP multicast addresses occur in the range from through (which corresponds to the Ethernet multicast address range of 01005e-000000 through 01005e-7fffff.) When a switch has a static traffic/security filter configured with a "multicast" filter type and a "multicast address" in this range, the switch will use the static filter unless IGMP learns of a multicast group destination in this range. In this case, IGMP dynamically takes over the filtering function for the multicast destination addresses, as long as the IGMP group is active. If the IGMP group subsequently deactivates, the switch returns filtering control to the static filter.