Netgear GS748Tv4 GS748Tv4 Software Administration Manual - Page 113
Switching, Multicast, IGMP Snooping, Table
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GS748T Smart Switch Software Administration Manual 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. 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 > IGMP Snooping > MFDB Table. The following table describes the fields in the MFDB Table. Field MAC Address VLAN ID Component Type Description The MAC Address to which the multicast MAC address is related. To search by MAC address, enter the address with the MFDB table entry you want displayed. Enter six two-digit hexadecimal numbers separated by colons, for example 00:0f:43:67:89:AB, and then click Go. If the address exists, that entry will be displayed. An exact match is required. The VLAN ID to which the multicast MAC address is related. This is the component that is responsible for this entry in the Multicast Forwarding Database. Possible values are IGMP Snooping or Static Filtering. This displays the type of the entry. Static entries are those that are configured by the end user. Dynamic entries are added to the table as a result of a learning process or protocol. Chapter 3: Configuring Switching Information | 113