ZyXEL Communications GS1910, XGS1910 61

Chapter 5 Tutorials

Follow the steps below to enable IGMP snooping on the Switch and a specific VLAN. You also have the Switch act as an IGMP proxy to report group changes to a connected multicast router (R).

Proxy

1Access the Switch through http://192.168.1.1. Log into the Switch by entering the username (default: admin) and password (default: 1234).

2Go to Configuration > IPMAC > IGMP Snooping > Basic Configuration. Select the Snooping Enabled check box to activate IGMP snooping on the Switch.

3The Unknown Multicast Flooding Enabled check box is selected by default and the Switch will send the frame(s) to all ports when the it receives an unknown multicast frame.

4In the IGMP SSM Range field, specify the source address range of the multicast group the clients will listen to. The Switch forwards the packets with the configured source address(es) to the clients that join this group. This help prevent the clients from receiving traffic resulting from unwanted sources.

5Set Leave Proxy Enabled and Proxy Enabled to allow the Switch to send a leave message with its MAC address to the multicast router/switch only when it receives the leave message from the last host in a multicast group. The Switch also replaces the source MAC address in an IGMP v1/v2 report with its own MAC address before forwarding to the multicast router/switch. When the Switch receives more than one IGMP v1/v2 join reports that request to join the same multicast group, it only sends a new join report with its MAC address. This helps reduce the number of multicast join and leave messages passed to the multicast router/switch.

6Select a router port (port 1 in this example) that connects to the multicast router or switch. The Switch forwards IGMP control messages (Query, Join and Leave) to the router port.

7Enable Fast Leave on the ports that connect to the hosts/clients (ports 7, 8 and 9 in this example). In fast leave mode, the Switch removes an IGMP snooping membership entry immediately from the forwarding table when an IGMP leave message is received on the port from a host. This helps speed up the leave process.

8Also set the maximum number of multicast groups the ports can join.

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