Figure 8-1 Configuring Igmp; Table 8-2 Igmp Query Mode - ZyXEL Communications Dimension ES-2008 User Manual

Ethernet switch

Table of Contents

Dimension ES-2008 Ethernet Switch

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.

The following table describes the options in the IGMP Query Mode field.

FIELD

IGMP Query

Select Auto to allow the network to automatically find the IGMP server.

Mode

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.

8-2