Draytek VigorSwitch P1085, User Manual, Page: 49 / 267

VigorSwitch P1085 User’s Guide 41
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IP multicast is a technique for one-to-many communication over an IP infrastructure in a
network.
To avoid the incoming data broadcasting to all GE ports, multicast is useful to transfer the
data/message to specified GE ports for IGMP snooping. When VigorSwitch receives a message
“subscribed” by the client, it must decide to transfer the data to specified GE ports according
to the location of the client (subscribed member).
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For the multicast packets, This page allows the network administrator to choose actions for
processing the unknown muliticast packets and for handling known packets with MAC address,
IP address and VLAN ID.
Available settings are explained as follows:
Item Description
Unknown Multicast
Action Select an action for switch to handle with unknown multicast
packet.

Drop: Drop the unknown multicast data.

Flood: Flood the unknown multicast data.

Forward to Router port: Forward the unknown multicast
data to router port.
IPv4 Forward Method Set the IPv4 multicast forward method.
 Dst. MAC & VID: Forward using destination multicast MAC
address and VLAN IDs.

Dst. IP & VID: Forward using destination multicast IP
address and VLAN ID.
Apply Apply the settings to the switch.