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Chapter 10 - Multicast
10-1 IGMP Snooping
This function is used to establish the multicast groups to forward the multicast
packet to the member ports, and, in nature, avoids wasting the bandwidth while IP
multicast packets are running over the network. This is because a switch that does
not support IGMP or IGMP Snooping cannot tell a multicast packet from a
broadcast packet, so it can only treat them all as a broadcast packet. Without IGMP
Snooping, a multicast packet forwarding function is plain and nothing is different
from a broadcast packet.
The switch supports IGMP Snooping with the functions of query, report and leave,
a type of packet exchanged between IP Multicast Router/Switch and IP Multicast
Host, can update the information of the Multicast table when a member (port) joins
or leaves an IP Multicast Destination Address. With this function, once a switch
receives an IP multicast packet, it will forward the packet to the members who
joined in a specified IP multicast group before.
The packets will be discarded by the IGMP Snooping if the user transmits multicast packets to the
multicast group that had not been built up in advance. IGMP mode enables the switch to issue IGMP
function that you enable IGMP proxy or snooping on the switch, which connects to a router closer to
the root of the tree. This interface is the upstream interface. The router on the upstream interface
should be running IGMP.
10-1.1 Basic Configuration
The section describes how to set the basic IGMP snooping on the switch, which connects to a
router closer to the root of the tree. This interface is the upstream interface. The router on the
upstream interface should be running IGMP.
Web Interface
To configure the IGMP Snooping parameters in the web interface:
1. Click Multicast, IGMP Snooping, and Basic Configuration.
2. Enable or disable which Global configuration.
3. Select the port you want to become a Router Port or enable/ disable the Fast Leave
function.
4. Scroll to set the Throttling and Profile.
5. Click the Apply button to save the setting.
6. To cancel the setting, click the Reset button to revert to previously saved values.
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