D-Link DES-1228 User Manual page 46

decisions by examining the contents of each frame's Layer 2 MAC
header.
IGMP snooping can help reduce cluttered traffic on the LAN. With
IGMP snooping enabled globally, the Web-Smart Switch will forward
multicast traffic only to connections that have group members
attached.
Please note that IGMP will not alter or route IP multicast packets. To
send IP multicast packets across subnetworks a multicast routing
protocol will be necessary.
Figure 313 – Configuration > IGMP Snooping Configuration
By default, IGMP is Disabled. If Enabled, the IGMP Global Settings
will need to be entered:
Query Interval (60-600 sec): The Query Interval is the interval
between General Queries sent. By adjusting the Query Interval, the
number of IGMP messages can increase or decrease; larger values
cause IGMP Queries to be sent less often. Default is 125 seconds.
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