Switching Commands
168
M4100 Series ProSAFE Managed Switches
MLD Snooping Commands
This section describes commands used for MLD Snooping. In IPv4, Layer 2 switches can use
IGMP Snooping to limit the flooding of multicast traffic by dynamically configuring Layer 2
interfaces so that multicast traffic is forwarded only to those interfaces associated with IP
multicast addresses. In IPv6, MLD Snooping performs a similar function. With MLD
Snooping, IPv6 multicast data is selectively forwarded to a list of ports that want to receive
the data, instead of being flooded to all ports in a VLAN. This list is constructed by snooping
IPv6 multicast control packets.
set mld
Use this command to enable MLD Snooping on the system (Global Config Mode) or an
interface (Interface Config Mode). This command also enables MLD Snooping on a particular
VLAN and enables MLD Snooping on all interfaces participating in a VLAN.
If an interface has MLD Snooping enabled and you enable this interface for routing or enlist it
as a member of a port-channel (LAG), MLD Snooping functionality is disabled on that
interface. MLD Snooping functionality is re-enabled if you disable routing or remove port
channel (LAG) membership from an interface that has MLD Snooping enabled.
MLD Snooping supports the following activities:
• V
alidation of address version, payload length consistencies and discarding of the frame
upon error.
• Maintenance of the forwarding table entries based on the MAC address versus the IPv6
address.
• Flooding of unregistered multicast data packets to all ports in the VLAN.
• Global Config
• Interface Config
• VLAN Mode
no set mld
Use this command to disable MLD Snooping on the system.
• Global Config
• Interface Config
• VLAN Mode
Default disabled
Format set mld <vlan-id>
Mode
Format no set mld <vlan-id>
Mode
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