IGMP Snooping Configuration Commands 97
2 Switching Commands
Type The type of the entry. Static entries are those that are configured by the end
user. Dynamic entries are added to the table as a result of a learning process or
protocol.
Description The text description of this multicast table entry.
Interfaces The list of interfaces that are designated for forwarding (Fwd:) and filtering
(Flt:).
IGMP Snooping Configuration Commands
This section describes the commands you use to configure IGMP snooping. D-Link Unified
Wired/Wireless Access System software supports IGMP Versions 1, 2, and 3. The IGMP
snooping feature can help conserve bandwidth because it allows the switch to forward IP
multicast traffic only to connected hosts that request multicast traffic. IGMPv3 adds source
filtering capabilities to IGMP versions 1 and 2.
set igmp
This command enables IGMP Snooping on the system (Global Config Mode) or an interface
(Interface Config Mode). This command also enables IGMP snooping on a particular VLAN
(VLAN Config Mode) and can enable IGMP snooping on all interfaces participating in a
VLAN.
If an interface has IGMP Snooping enabled and you enable this interface for routing or enlist it
as a member of a port-channel (LAG), IGMP Snooping functionality is disabled on that
interface. IGMP Snooping functionality is re-enabled if you disable routing or remove port-
channel (LAG) membership from an interface that has IGMP Snooping enabled.
The IGMP application supports the following activities:
• Validation of the IP header checksum (as well as the IGMP header checksum) and discard-
ing of the frame upon checksum error.
• Maintenance of the forwarding table entries based on the MAC address versus the IP
address.
• Flooding of unregistered multicast data packets to all ports in the VLAN.
Default disabled
Format
set igmp
Modes Global Config
Interface Config
Format
set igmp <vlanid>
Mode VLAN Config
no set igmp
This command disables IGMP Snooping on the system, an interface or a VLAN.
Format
no set igmp
Modes Global Config
Interface Config
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