4-20
Switching Features
IGMP Snooping
IGMP Snooping
Internet Group Management Protocol (IGMP) snooping allows a device to forward multicast traffic intelligently.
Multicast IP traffic is traffic that is destined to a host group. Host groups are identified by class D IP addresses,
which range from 224.0.0.0 to 239.255.255.255. Based on the IGMP query and report messages, the switch
forwards traffic only to the ports that request the multicast traffic. This prevents the switch from broadcasting
the traffic to all ports, which could affect network performance.
When enabled, the switch supports IGMPv1 and IGMPv2.
To enable IGMP snooping and view global status information, click Switching > IGMP Snooping in the
navigation pane.
Figure 4-13. IGMP Snooping Page
Table 4-11. IGMP Snooping Fields
If you change the Admin Mode, click Apply to save the changes for the current boot session. The changes take
effect immediately.
Field Description
IGMP Snooping Select Enabled to globally enable IGMP snooping on the switch. This feature is disabled by
default.
Multicast Control
Frame Count
The number of multicast control frames that have been processed by the CPU since the switch was
last reset.
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