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Chapter 5: Using the Web-based Utility for Configuration
Switch Conf. (Configuration) Tab - IGMP Snooping
WebView Switches
Switch Conf. (Configuration) Tab - IGMP Snooping
When IGMP Snooping is enabled globally, all IGMP packets are forwarded to the CPU. The CPU analyzes the
incoming packets and determines:
Which ports want to join which Multicast groups.
Which ports have Multicast routers generating IGMP queries.
What routing protocols are forwarding packets and Multicast traffic.
Ports requesting to join a specific Multicast group issue an IGMP report, specifying that Multicast group is
accepting members. This results in the creation of the Multicast filtering database.
The IGMP Snooping page contains the following fields:
Enable IGMP Snooping Status. When this box is checked, IGMP Snooping is enabled on the Switch. IGMP
Snooping can be enabled only if Bridge Multicast Filtering is enabled.
VLAN ID. Specifies the VLAN ID.
IGMP Snooping Status. Indicates if IGMP snooping is enabled or disabled on the VLAN.
Enable Auto Learn. Indicates if Auto Learn is enabled or disabled on the Switch. If Auto Learn is enabled, the
Switch automatically learns where other Multicast groups are located.
Host Timeout. Indicates the amount of time host waits to receive a message before timing out. The default time
is 260 seconds.
MRouter Timeout. Indicates the amount of the time the Multicast router waits to receive a message before it
times out. The default value is 300 seconds.
Leave Timeout. Indicates the amount of time the host waits, after requesting to leave the IGMP group and not
receiving a Join message from another station, before 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.
Click the Edit icon, which looks like a pen, to edit any of the IGMP Snooping settings. Click the Submit button to
activate any changed you made on this screen.
Figure 5-21: Switch Configuration - IGMP Snooping
Figure 5-22: Switch Configuration - Edit IGMP Snooping
