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Configuring Switching Information
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GS752TP, GS728TP, and GS728TPP Gigabit Smart Switches
the shared media for the period that the multicast packet is flooded. The problem of wasting
bandwidth is even worse when the LAN segment is not shared, for example in full-duplex
links.
Allowing switches to snoop IGMP packets is a creative effort to solve this problem. The
switch uses the information in the IGMP packets as they are being forwarded throughout the
network to determine which segments should receive packets directed to the group address.
From the IGMP Snooping link, you can access features described in the following sections:
IGMP Snooping Configuration
IGMP Snooping Table
IGMP Snooping VLAN Configuration
IGMP Snooping Configuration
Use the IGMP Snooping Configuration screen to configure the parameters for IGMP
snooping.
To configure IGMP Snooping:
1. Select Switching
Multicast IGMP Snooping IGMP Snooping Configuration.
The following screen displays:
2. Next to IGMP Snooping Status, enable or disable IGMP snooping on the switch.
Enable.
The switch snoops all IGMP packets it receives to determine which
segments should receive packets directed to the group address.
Disable.
The switch does not snoop IGMP packets.
3. Select whether to block unknown multicast addresses.
Enable. Packets with unknown multicast MAC addresses in the destination field are
dropped.
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