Enabling multicast group replacement
About multicast group replacement
If the number of multicast groups on a port reaches the upper limit, the port automatically drops new IGMP reports. After you enable the multicast group replacement feature, the port leaves a multicast group that has the lowest IP address and joins the new group contained in the IGMP report. This feature is typically used in the channel switching application.
Restrictions and guidelines
This feature takes effect only on the multicast groups that a port joins dynamically.
This feature does not take effect if the following conditions exist:
The number of the IGMP snooping forwarding entries on the device reaches or exceeds the upper limit.
The multicast group that the port newly joins is not included in the multicast group list maintained by the device.
Enabling multicast group replacement globally
Enter system view.
system-view
Enter IGMP-snooping view.
igmp-snooping
Enable multicast group replacement globally.
overflow-replace [ vlan vlan-list ]
By default, multicast group replacement is disabled globally.
Enabling multicast group replacement on a port
Enter system view.
system-view
Enter Layer 2 interface view.
Enter Layer 2 Ethernet interface view.
interface interface-type interface-number
Enter Layer 2 aggregate interface view.
interface bridge-aggregation interface-number
Enable multicast group replacement on the port.
igmp-snooping overflow-replace [ vlan vlan-list ]
By default, multicast group replacement is disabled on a port.