PLANET WGSW-50040 - Manual (Page 167)

22-1
Chapter 22 IPv6 Multicast Protocol
22.1 MLD Snooping
22.1.1 Introduction to MLD Snooping
MLD, the Multicast Listener Discovery Protocol, is used to realize multicasting in the IPv6. MLD is used by the
network equipments such as routers which supports multicast for multicast listener discovery, also used by
listeners looking forward to join certain multicast group informing the router to receive data packets from
certain multicast address, all of which are done through MLD message exchange. First the router send an
MLD Multicast listener Query message through a multicast address which can address all the listeners
(namely ff02::1). Once there is a listener who wishes to join the multicast address, it will send a MLD Multicast
listener Report back through the multicast address.
MLD Snooping is namely the MLD listening. The switch restricts the multicast traffic from flooding through
MLD Snooping, and forward the multicast traffic to ports associated to multicast devices only. The switch
listens to the MLD messages between multicast routers and listeners, and maintains the multicast group
forwarding list based on the listening result. The switches forwards multicast packets according to the
multicast forwarding list
The switch realizes the MLD Snooping function while supporting MLD v2. This way, the user can acquire IPv6
multicast with the switch.
22.1.2 MLD Snooping Configuration Task
1. Enable the MLD Snooping function
2. Configure the MLD Snooping
1. Enable the MLD Snooping function
Command Explanation
Global Mode
ipv6 mld snooping
no ipv6 mld snooping
Enable global MLD Snooping, the “no ipv6
mld snooping” command disables the
global MLD snooping.
2. Configure MLD Snooping
Command Explanation
Global Mode