IGMP Snooping 65
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 pre-
vents 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 37. IGMP Snooping Page
Table 27. 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 but are not retained across a switch reset unless you click Save Con-
figuration.
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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