3Com Switch 7750 Configuration Guide Guide

394 CHAPTER 40: IGMP SNOOPING CONFIGURATION
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CAUTION:
■ A multicast VLAN cannot be configured as a multicast sub-VLAN.
■ A multicast sub-VLAN cannot be configured as a multicast VLAN.
■ A multicast sub-VLAN cannot be configured as the sub-VLAN of another
multicast VLAN.
■ A multicast sub-VLAN is corresponding to a multicast VLAN only.
■ If multicast routing is enabled on a VLAN interface, the corresponding VLAN
cannot be configured as a multicast VLAN.
Displaying and
Maintaining IGMP
Snooping
After the configuration above, you can execute the display command to verify
the configuration by checking the displayed information.
You can execute the reset command to clear the statistics information about
IGMP Snooping.
Tabl e 315 Configure multicast VLAN
Operation Command Description
Enter system view system-view -
Enable the IGMP snooping
function globally
igmp-snooping enable Required
Enter VLAN view vlan vlan-id -
Enable the IGMP snooping
function
igmp-snooping enable Required
Enable the multicast VLAN
function
multicast-vlan enable Required
Configure the mapping
relationship between
multicast VLAN and multicast
sub-VLANs
multicast-vlan vlan-id
subvlan vlan-list
Required
Tabl e 316 Display information about IGMP Snooping
Operation Command Description
Display the current IGMP
Snooping configuration
display igmp-snooping
configuration
You can execute the display
commands in any view.
Display IGMP Snooping
message statistics
display igmp-snooping
statistics
Display IP and MAC multicast
groups in one or all VLANs
display igmp-snooping
group [ vlan vlanid ]
Display the configuration of
the multicast VLAN
display multicast-vlan [
vlan-id ]
Clear IGMP Snooping
statistics
reset igmp-snooping
statistics
You can execute the reset
command in user view.