D-Link DES-3225G - Manual (Page 61)

24-port NWay Ethernet Switch User’s Guide
Using the Console Interface 51
Figure 6-23. IGMP Configuration screen
Items in the above window are defined as follows:
♦ IP Multicast Filtering Age-out Timer(30-9999) When this timer expires and the Switch has not observed
(snooped) any IGMP query packets asking whether any stations belong to any Multicast groups, the Switch itself will
send out queries and become the IGMP host on your network.
♦ IP Multicast Filtering (IGMP Snooping) This enables or disables the Switch to intelligently forward IGMP
and Multicast packets instead of broadcasting (flooding) them on all ports. This setting also enables IGMP Snooping,
which enables the Switch to read IGMP packets being forwarded through the Switch in order to obtain forwarding
information from them (learn which ports contain Multicast members).
If IEEE 802.1Q VLANs is selected on the VLANs & MAC-based Broadcast Domains Configuration screen,
Configure 802.1Q IGMP will appear at the bottom of the IGMP Configuration screen. This screen allows IGMP to
operate in conjunction with IEEE 802.1Q VLANs. The screen is shown below: