Switching
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XS728T ProSAFE 28-Port 10-Gigabit L2+ Smart Switch
few nodes. Packets are flooded into network segments where no node has any interest in
receiving the packet. While nodes rarely incur any processing overhead to filter packets
addressed to unrequested group addresses, they are unable to transmit new packets onto
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.
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.
• Disable. Packets with unknown destination multicast MAC addresses are flooded to
all interfaces in VLAN.
4. Click Apply to send the updated configuration to the switch.
Configuration changes take place immediately.
The following table displays information about the global IGMP snooping status.
Field Description
VLAN IDs Enabled For IGMP
Snooping
Displays VLAN IDs enabled for IGMP snooping. For more information about
how to enable VLANs for IGMP snooping, see IGMP Snooping VLAN
Configuration on page 71.
VLAN IDs Enabled For IGMP
Snooping Querier
Displays VLAN IDs enabled for IGMP snooping querier.
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