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

Name of the IP group for the MLD configuration.

node-ip ip-address

Name of the IP host for the MLD configuration.

vnet vnet-name

Name of the vNET assigned to the MLD configuration.

l2-net l2-net-name

Name of the Layer 2 network.

vlan vlan-id

The ID of the VLAN for the MLD configuration.

port port-number

The number of the port for the MLD configuration.

source-ip ip-address

The IP source name for the MLD configuration.

node-type host|router|switch

The node type as host or router.

expires expires-number(s)

The ageout time.

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, forwards multicast traffic 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

switch  group-ip    node-ip                 vlan port source  expires(s) 

------- ----------- ----------------------- ---- ---- ------- ---------- 

switch1 ff03::69    fe80::200:aff:fe6c:50de 1    8 237        

switch1 ff03::68    fe80::200:aff:fe6c:50de 1    8 237        

switch1 ff03::67    fe80::200:aff:fe6c:50de 1    8 237        

switch1 ff03::66    fe80::200:aff:fe6c:50de 1    8 237        

switch1 ff03::65    fe80::200:aff:fe6c:50de 1    8 237        

switch1 ff03::64    fe80::200:aff:fe6c:50de 1    8 237        

switch1 ff03::63    fe80::200:aff:fe6c:50de 1    8 237        

switch1 ff03::62    fe80::200:aff:fe6c:50de 1    8 237        

switch1 ff03::61    fe80::200:aff:fe6c:50de 1    8 237        

switch1 ff03::60    fe80::200:aff:fe6c:50de 1    8 237        

switch1 ff03::59    fe80::200:aff:fe6c:50de 1    8 237        

switch1 ff03::58    fe80::200:aff:fe6c:50de 1    8 237        

switch1 ff03::57    fe80::200:aff:fe6c:50de 1    8 237        

switch1 ff03::56    fe80::200:aff:fe6c:50de 1    8 237