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5 IGMP Snooping
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5.1 Basic
Configuration
The function is used to establish the multicast groups to forward the multicast
packet to the member ports. It also avoid wasting bandwidth while IP multicast
packets are running over the network. This happens because a switch that does not
support IGMP or IGMP Snooping cannot tell the multicast packet from the broadcast
packet, so it can only treat them all as the broadcast packet. Without IGMP
Snooping, the multicast packet forwarding function is plain and nothing is different
from broadcast packet.
A switch supported IGMP Snooping with the functions of query, report and leave. It
is a type of packet exchanged between IP Multicast Router/Switch and IP Multicast
Host. It can update the information of the Multicast table when a member (port)
joins or leaves an IP Multicast Destination Address. 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.
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 Configuration, IGMP Snooping, Basic Configuration.
2.
Evoke to select enable or disable which Global configuration.
3.
Evoke which port wants to become a Router Port or enable/disable the Fast
Leave function.
4.
Scroll to set the “Throttling” parameter.
5.
Click “Save” to save the setting.
6.
If you want to cancel the setting, click the reset button to revert back to
previously saved values.
