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DES-7200 Configuration Guide Chapter 9 MLD Snooping Configuration
9-1
9 MLD Snooping
Configuration
9.1 Understanding MLD Snooping
9.1.1 MLD Snooping Overview
MLD Snooping is the short form of Multicast Listener Discovery Snooping.
It is
designed to manage and control the transmission of IPv6 multicast stream on
layer 2.
By running the MLD Snooping equipment and analyzing the MLD message
received, mapping relationship is established for port and MAC multicasting
address, and such relationship provides a basis for the transmission of IPv6
multicast data on layer 2.
When the MLD Snooping is not running, IPv6 multicast
data message is broadcast on layer 2; while after the switch places MLD
Snooping into operation, the known multicast data message of IPv6 multicast
group will not be broadcast on layer 2, but be exchanged to specified receiver(s)
on layer 2.
9.1.2 Basic Concepts of MLD Snooping
9.1.2.1 Understanding two types of MLD
Snooping ports
As shown in Figure 1, Router is connected with multicast source and with the
switch to run MLD Snooping, host A and host C become the hosts (or multicast
listener) of receiver.