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XG Series User's Guide Chapter 4 Switch Functions and their Configuration
IGMP Snooping
80
4.8.3 Managing Group Members
When network congestion causes Leave message loss or there is a host that uses IGMPv1, the multicast router does not
receive Leave messages. The multicast router sends out an IGMP General Query message to all hosts (IP address:
224.0.0.1) at intervals (query interval) to determine membership information.
Upon reception of an IGMP General Query message, the host, a member of the group, returns an IGMP Report message to
maintain membership in the group.
In consideration of General Query or Report message loss caused by network congestion, since RFC 2236 defines the
default query interval for multicast routers as 125 seconds, this device uses 126 seconds for the group member interval
when it works as a Querier.
XG
Managing Group Members
Multicast Router
Port 1 Port 2 Port 3
VLAN 10
Port 8
IGMP General Query
MAC : 0100.5E01.0001
Destination IP : 224.0.0.1
Group IP : 0.0.0.0
IGMP General Query
MAC : 0100.5E01.0001
Destination IP : 224.0.0.1
Group IP : 0.0.0.0
Terminal 1 Terminal 2
Terminal 3
1, 8
Port
0100.0501.0203
MAC Address Table
Port(MAC address)
(01:00:05:01:02:03)
IGMP snooping Control Table
VLAN(RouterPort)
VLAN
10 (8)
239.1.2.3
1
Reporter
192.168.10.20
Group IP