Command Reference Guide

MLD Snooping Commands
CLI Command Reference
September 2014 Page 434
HP Moonshot Switch Module CLI Command Reference
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
This command enables 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:
• Validation 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.
Note: This note clarifies the prioritization of MGMD Snooping Configurations. Many of the IGMP/
MLD Snooping commands are available both in the Interface and VLAN modes. Operationally the
system chooses or prefers the VLAN configured values over the Interface configured values for most
configurations when the interface participates in the VLAN.
Default disabled
Format
set mld vlanid
Mode VLAN Mode
Default disabled
Format
set mld
Mode • Global Config
•Interface Config