D-Link DES-6000 User Manual page 61

IGMP packets being forwarded through the switch in order to obtain forwarding information from them
(dynamically learn which ports contain Multicast members), and forward multicast packets only to the
members.
Basically, in these submenus you define whether the Switch can intelligently forward IGMP packets, and you
must also define which 802.1Q VLANs (if present) can send and receive IGMP and Multicast packets.
To access the IGMP Configuration screen, select Configure Filtering and Forwarding Table from the
System Configuration menu. Then select Configure IGMP from the bottom of the Configure Filtering
and Forwarding table screen. The following screen appears:
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/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).
The bottom of this screen allows you to configure IGMP for individual VLANs. If 802.1Q or port-based VLANs
are enabled on your network, you must specify which VLANs can support multicast traffic. Choose Configure
802.1Q IGMP or Configure Port-based IGMP depending on the type of VLANs you are using.
Using the Console Interface
Figure 6-24. IGMP Configuration screen
Modular Ethernet Switch User's Guide
51