H3C Technologies H3C WX6000 Series Access Controllers - Manual (Page 335)

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To address such situations, you can enable the multicast group replacement function on the switch or
certain ports. When the number of multicast groups joined on the switch or a port has joined reaches the
limit:
z
If the multicast group replacement feature is enabled, the newly joined multicast group
automatically replaces an existing multicast group with the lowest address.
z
If the multicast group replacement feature is not enabled, new IGMP reports will be automatically
discarded.
Configuring multicast group replacement globally
Follow these steps to configure multicast group replacement globally:
To do... Use the command... Remarks
Enter system view system-view —
Enter IGMP Snooping view igmp-snooping —
Configure multicast group
replacement
overflow-replace [ vlan vlan-list ]
Required
Disabled by default
Configuring multicast group replacement on a port or a group of ports
Follow these steps to configure multicast group replacement on a port or a group of ports:
To do... Use the command... Remarks
Enter system view system-view —
Enter Ethernet
port view interface interface-type
interface-number
Enter the
corresponding view
Enter port group
view
port-group { manual
port-group-name | aggregation
agg-id }
Use either command
Configure multicast group replacement
igmp-snooping overflow-replace
[ vlan vlan-list ]
Required
Disabled by default
Be sure to configure the maximum number of multicast groups allowed on a port (refer to Configuring
Maximum Multicast Groups that Can Be Joined on a Port ) before configuring multicast group
replacement. Otherwise, the multicast group replacement functionality will not take effect.
Displaying and Maintaining IGMP Snooping
To do... Use the command... Remarks
View the information of IGMP Snooping
multicast groups display igmp-snooping group [ vlan vlan-id ]
[ verbose ]
Available in any
view
View the statistics information of IGMP
messages learned by IGMP Snooping
display igmp-snooping statistics
Available in any
view