Igmp Snooping - Fujitsu XG0224 User Manual

XG Series User's Guide
4.8

IGMP Snooping

IP multicast is often used to distribute multimedia data, including video and voice, over a network.
A layer 2 switch floods multicast frames, absorbing unnecessary network bandwidth. A layer 3 switch that supports
Internet Group Management Protocol (IGMP) manages multicast groups using IGMP packets. The device controls how IP
multicast packets are forwarded to required ports by monitoring IGMP packets generated by layer 3 switches, thereby
preventing unnecessary flooding. This function is called "IGMP Snooping".
The device supports IGMP snooping for IGMP v1/v2.
Flooding to all
Flooding to all
ports
ports
If "igmpsnoop unknown flooding off" command is set (the default setting), any Multicast frames except IPv4 Multicast packets
Note
are never will not flooding all ports belonging to the same VLAN.
When you using IPv6 or another protocol, please set use the "igmpsnoop unknown flooding on" command (XG0224 / XG0448
/ XG0440DC / XG0440DCR).
Multicast Server
Multicast Router
Layer 2
Switch
IGMP No Snooping
Transfer only to
Transfer only to
the required
the required
ports
ports
XG
Terminal

IGMP Snooping

IGMP Snooping
77
Chapter 4 Switch Functions and their Configuration
Multicast Server
Multicast Router
Layer 2
Switch
Terminal
IGMP Snooping