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Dimension ES-2008 Ethernet Switch
8-2 Filter and Security Setup
8.1.1 Configuring IGMP
Follow the steps below to activate IGMP on the switch.
Step 1. Click Administrator and then Switch Configuration.
Step 2. In the Switch Configuration screen, click the Advanced tab.
Step 3. Select the Enable IGMP Protocol check box under Protocol Enable Setting.
Step 4. Select a choice from the IGMP Query Mode field drop-down list box.
Figure 8-1 Configuring IGMP
The following table describes the options in the IGMP Query Mode field.
Table 8-2 IGMP Query Mode
FIELD DESCRIPTION
IGMP Query
Mode
Select Auto to allow the network to automatically find the IGMP server.
The multicast device with the lowest numerical IP address to be the IGMP
server. This is the default setting.
Select Enable to force this switch to be the IGMP server even when there
is already an IGMP server on the network. Selecting this option may
affect network performance.
Select Disable to forcibly disallow this switch from being an IGMP server.
8.1.2 IGMP Examples
This section presents IGMP examples for each IGMP query mode.
A source of multicasts, such as the Video-on-Demand server in our examples, should be
as close to the IGMP server as possible in order to reduce broadcasts.
Example 1: Select an IGMP Server Automatically
In the figure below, when you select Auto in the IGMP Query Mode field on all
switches, Switch C will become the IGMP server since it has the lowest numerical IP
address on the network.