SGS-6341-Series User Manual

Chapter 39 IPv6 Multicast Protocol
39.1 MLD Snooping
39.1.1 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.
39.1.2 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.
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User’s Manual of SGS-6341 series