Multicast Listener Discovery


Multicast Listener Discovery (MLD) is a Layer 3 multicast protocol used between IPv6 hosts and routers similar to how IGMP is used for IPv4. MLD snooping allows a switch to examine MLD packets and make forwarding decisions based on their content.

MLD snooping constrains IPv6 multicast traffic at Layer 2 by configuring Layer 2 LAN ports dynamically to forward IPv6 multicast traffic only to those ports that want to receive it.

The default behavior, when MLD Snooping is not configured, multicast traffic will be forwarded to all the switch ports, impacting switch performance.

Syntax   mld-show group-ip ip-address node-ip ip-address vlan vlan-id port port-number source-ip ip-address node-type Host|Router expires expires-number(s)

group-ip ip-address

Specifies the name of the IP group for the MLD configuration.

node-ip ip-address

Specifies the name of the IP host for the MLD configuration.

vnet vnet-name

Specifies the name of the VNET assigned to the MLD configuration.

l2-net l2-net-name

Specifies the name of the Layer 2 network.

vlan vlan-id

Specifies the ID of the VLAN for the MLD configuration.

port port-number

Specifies the number of the port for the MLD configuration.

source-ip ip-address

Specifies the IP source name for the MLD configuration.

node-type host|router|switch

Specifies the node type as host or router.

expires expires-number(s)

Specifies the ageout time.

Formatting Options

format fields-to-display

Display output using a specific parameter. Use all to display all possible output.

parsable-delim character

Display output formatted for machine parsing using a specified delimiter.


Display output in ascending order.


Display output in descending order.

show dups

Display duplicate entries in the output.

layout vertical|horizontal

Format the output in a vertical or horizontal layout.

show-interval seconds-interval

Repeat the show command at a specified interval.


Display column headers or not.

limit-output number

Limit the display output to a specific number of entries.


Display the number of entries in the output. This is useful with vRouter show commands.


Display full values in the output instead of scaled approximate values.


Display integer values instead of mapped values


Aggregate output by specific parameters. If sum-by fields are specified, records that have the same value in sum-by fields are combined and displayed as one aggregate record. NOTE: This option is only available for show commands that collect statistics such as connection-stats-show.

Defaults   None.

Access   CLI


Version 2.3

Command introduced.

Version 2.4.1

The parameter, switch, deprecated. The parameter, vnet, added.

Version 3.0.0

The parameter, l2-net, added.

Usage   Default behavior, when MLD is not configured, multicast traffic is forwarded to all the switch ports, impacting switch performance.

Examples  To display MLD parameters for the local switch, use the following command:

CLI network-admin@switch > mld-show