Draytek Vigor2136 Series User Manual page 257

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Multicast
IGMP snooping is the process of listening to Internet Group Management Protocol (IGMP) network
traffic. The feature allows a network switch to listen in on the IGMP conversation between hosts and
routers. By listening to these conversations the switch maintains a map of which links need which IP
multicast streams. Multicasts may be filtered from the links which do not need them and thus
controls which ports receive specific multicast traffic.
MLD snooping does the same thing as IGMP snooping. The difference is that IGMP snooping acts
on IPv4 packets; MLD snooping acts on IPv6 packets. MLD snooping is the process of listening to
Multicast Listener Discovery network traffic. It can examine IPv6 packets and forward these packets
to designate location via VLAN port members.
Available settings are explained as follows:
Item
Profile Name
Throttling Max. Group
GE port.
Fixed – The selected GE port only sends static VLAN information to
neighboring device and allows static VLAN packet to pass through.
Forbidden – The selected GE port only allows default VLAN packet to
pass through.
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Description
Enter a name for the Switch. The purpose of name is used for
identification.
It is useful when there are many VigorSwitch (same modes) devices
connecting to Vigor router.
IGMP Snooping
Define the maximum number of IGMP group profile that a user on the
switch can join. If "0" is selected, then such interface (port) can join all
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