IGMP snooping with private VLANs

A PVLAN consists of secondary isolated and community VLANs configured within a primary VLAN. Without IGMP snooping support on the secondary VLANs, multicast streams received on a primary VLAN are flooded to the secondary VLANs. This feature extends IGMP snooping on a primary VLAN to its secondary VLANs, which further constrains multicast streams only to interested receivers on PVLANs. When IGMP snooping is enabled on a primary VLAN, it is implicitly enabled on all secondary VLANs, and the secondary VLANs learn the multicast group information on the primary VLAN.