Reference Guide

Multicast Listener Discovery | 593
Display the MLD Group Table
Clear MLD Groups
Clear a specific group or all groups on an interface from the multicast routing table using the command
clear ipv6 mld groups from EXEC Privilege mode.
Change the MLD Version
Debug MLD
MLD Snooping
Multicast packets are addressed with multicast MAC addresses, which represent a group of devices, rather
than one unique device. Switches forward multicast frames out of all ports in a VLAN by default, even
though there may be only some interested hosts, which is a waste of bandwidth. MLD Snooping enables
switches to use information in MLD packets to generate a forwarding table that associates ports with
multicast groups so that when they receive multicast frames, they can forward them only to interested
receivers.
Enable MLD Snooping
MLD is automatically enabled when you enable IPv6 PIM, but MLD Snooping must be explicitly enabled.
Task Command Syntax Command Mode
Display MLD groups. Group information can be
filtered, refer to the FTOS Command Line Reference
for the options available with this command.
show ipv6 mld {groups | interface} EXEC Privilege
Task Command Syntax Command Mode
Change the MLD version. ipv6 mld version 1
Default: MLD version 2
INTERFACE
Task Command Syntax Command Mode
Display FTOS messages about the MLD process. debug ipv6 mld EXEC Privilege
Task Command Syntax Command Mode
Enable MLD Snooping ipv6 mld snooping enable CONFIGURATION