D-Link DAS-3224_revB User Manual

The IGMP Snooping allows you to view and change the IGMP Snooping administrate status.   
 
IP traffic can be transmitted in one of either three ways: unicast (one sender to one receiver), broadcast 
(one sender to all members on the network) or multicast (one sender to a group of hosts). IGMP is a 
session-layer (layer-3) protocol used to establish membership in a multicast group.   
 
Multicast addresses are Class D IP address, from 224.0.0.0 to 239.255.255.255. These addresses are 
also referred to as Group Destination Address (GDA). Each GDA address is associated with one MAC 
address. The GDA MAC address is constructed by joining 01:00:5E and the last 23 bits of the GDA 
multicast IP address in Hex. For example, GDA 224.1.1.1 corresponds to MAC address 
01:00:5E:01:01:01.  
 
A layer-2 switch supported IGMP snooping can passively snoop on IGMP Query, Report and Leave 
packets transferred between Routers/Switches and hosts to learn the IP Multicast group membership. It 
snoops IGMP packets passing through it, picks out the group registration information, and configures 
multicasting accordingly.   
 
 

 

 
 
 

System IGMP Snooping Status 

Specified whether or not IGMP Snooping is to be enabled in the system. 

Port ID 

This specifies the network port interface. 

VPI/VCI 

This specifies the virtual path, circuit identification for the PVC in the port.   

IGMP Snooping Status 

A Bridge Port, for which IGMP Snooping needs to be enabled or disabled.