Displaying And Debugging Igmp Snooping; Igmp Snooping Configuration Example; Enable Igmp Snooping - 3Com 8800 Configuration Manual

3Com Switch 8800 Configuration Guide
Caution:
If IGMP snooping is not enabled on the VLAN (nor Layer 3 multicast), unknown
multicast packets are broadcasted within the VLAN no matter whether this function is
enabled or not. That is, to make unknown multicast packets not be broadcasted with a
VLAN, you must enable igmp-snooping in this VLAN and enable igmp-snooping
nonflooding-enable globally.
Perform the following configuration in system view.
Table 24-5 Globally enable/disable multicast packets not broadcasted within a VLAN
Enable multicast packets not to be
broadcasted within a VLAN
Disable multicast packets not to be
broadcasted within a VLAN
By default, unknown multicast packets are broadcasted within the VLAN.

24.3 Displaying and debugging IGMP Snooping

After the above configuration, execute display command in any view to display the
running of the IGMP Snooping configuration, and to verify the effect of the
configuration.
Table 24-6 Displaying and debugging IGMP Snooping
Display the information about current IGMP
Snooping configuration
Display
received and sent messages
Display IP/MAC multicast group information
in the VLAN

24.4 IGMP Snooping Configuration Example

24.4.1 Enable IGMP Snooping

I. Networking requirements
Operation
Operation
IGMP Snooping statistics
Chapter 24 IGMP Snooping Configuration
igmp-snooping nonflooding-enable
undo
nonflooding-enable
display
configuration
of
display igmp-snooping statistics
display
[ vlan vlanid ]
24-7
Command
igmp-snooping
Command
igmp-snooping
igmp-snooping group