Netgear GS752TS GS7xxTS-TPS Software Admin Manual - Page 135

GS728TS, GS728TPS, GS752TS, and GS752TPS Gigabit Smart Switches Multicast Multicast IP traffic is traffic that is destined to a host group. Host groups are identified by class D IP addresses, which range from 224.0.0.0 to 239.255.255.255. From the Multicast link, you can access the following pages: • MFDB on page 135 • Auto-Video Configuration on page 137 • IGMP Snooping on page 138 • IGMP Snooping Querier on page 144 • MLD Snooping on page 147 MFDB The Layer 2 Multicast Forwarding Database (MFDB) is used by the switch to make forwarding decisions for packets that arrive with a multicast destination MAC address. By limiting multicasts to only certain ports in the switch, traffic is prevented from going to parts of the network where that traffic is unnecessary. When a packet enters the switch, the destination MAC address is combined with the VLAN ID and a search is performed in the Layer 2 Multicast Forwarding Database. If no match is found, then the packet is either flooded to all ports in the VLAN or discarded, depending on the switch configuration. If a match is found, then the packet is forwarded only to the ports that are members of that multicast group. MFDB Table The MFDB table holds the port membership information for all active multicast address entries. Use the MFDB Table page to view the port membership information for all active multicast address entries. The key for an entry consists of a MAC address. Entries may contain data for more than one protocol. To access the MFDB Table page, click Switching Multicast  MFDB  MFDB Table. 135