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2.13 MLD Snoop Function
MLD snoop function confirms the MLD packets sent from the source and transmits IPv6 multicast packets to the
port where receiver is present.
Source
Terminal or multicast router connected to this device
Port where receiver exists
Port where listener of multicast group address exists or the port where multicast router is connected
By using this function, unexpected IPv6 multicast packets are not received by the terminal and load of terminal
can be reduced.
MLD snoop function of this device supports version 1 of MLD protocol.
Conditions of the ports of this device, that are identified as port where multicast router is connected or
port where the listener exist are shown below.
Port
Multicast router port
Listener port
When the packet that has the address of multicast group in the address is received, this device transfers that
packet only to the multicast router port and the listener port.
It is recognized by the following conditions by the multicast router port settings (vlan
<vlan_id> igmpsnoop router).
▪ When auto is specified
When MLD Query packets are received, that port is recognized as multicast router port.
▪ When yes<port_no > is specified
At the time of start-up, the port specified by the settings is recognized as multicast router
port. Further, as in the case where auto is specified, the port where MLD Query packet is
received is also recognized as multicast router port.
The port where the MLD Membership Report packet is received is recognized as a listener
port.
Recognized conditions
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