DGS-3100 Series Gigabit Stackable Managed Switch User Manual
Defining IGMP Snooping
When IGMP Snooping is enabled globally, all IGMP packets are forwarded to the CPU. The CPU analyzes the incoming
packets and determines the following information:
– Which ports want to join which Multicast groups.
– Which ports have Multicast routers generating IGMP queries.
– Which routing protocols are forwarding packets and Multicast traffic.
Ports requesting to join a specific Multicast group issue an IGMP report, specifying that this Multicast group is accepting
members. This results in the creation of the Multicast filtering database.
1. Click L2 Features > IGMP Snooping. The
IGMP Snooping Page opens:
Figure 3–11. IGMP Snooping Page
The
IGMP Snooping Page contains the following fields:
Field Description
IGMP Snooping
Enables or disables IGMP Snooping. Bridge Multicast Filtering must first
be enabled in order to enable IGMP Snooping. The possible field values are:
Enabled — Enables IGMP Snooping on the device.
Disabled — Disables IGMP Snooping on the device. (This is the default
value).
VLAN ID
Specifies the VLAN ID.
VLAN Name
Displays the user-defined VLAN name.
Leave Timer
Defines the time a host waits to receive a Join message from another station
after requesting to leave the IGMP group, prior to timing out. If a Leave
Timeout occurs, the switch notifies the Multicast device to stop sending
traffic. The Leave Timeout value is either user-defined, or an immediate
leave value. The default timeout is 10 seconds. The field range is 0-
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