SNR S2989G-48TX-RPS — iPv6 Multicast Listener Discovery and MLD Snooping Guide [539/553]

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S2989G-24TX Operation Manual

Chapter 11 IPv6 Configuration

11-29

 Unicast route shall be used to carry out RPF examination for

multicast protocol. So the correctness of unicast route shall be

guaranteed above all.

If all attempts fail to solve the problems on MLD, please use debug commands such as

debug ipv6 MLD event/packet, and copy DEBUG information in 3 minutes and send to

Technology Service Center.

11.5.2

MLD Snooping

11.5.2.1 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.

11.5.2.2 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