Enabling multicast group replacement
This feature enables the switch to replace an existing group with a newly joined group when the number of groups exceeds the upper limit. This feature is typically used in channel switching applications. Without this feature, the Layer 2 device discards IGMP reports for new groups, and the user cannot change to a new channel.
Configuration restrictions and guidelines
When you enable multicast group replacement, follow these guidelines:
This configuration takes effect only on the multicast groups that a port joins dynamically.
You can enable this feature globally for all ports in IGMP-snooping view or for a port in interface view. For a port, the port-specific configuration takes priority over the global configuration.
Enabling multicast group replacement globally
Step | Command | Remarks |
|---|---|---|
1. Enter system view. | system-view | N/A |
2. Enter IGMP-snooping view. | igmp-snooping | N/A |
3. Enable multicast group replacement globally. | overflow-replace [ vlan vlan-list ] | By default, multicast group replacement is disabled. |
Enabling multicast group replacement on a port
Step | Command | Remarks |
|---|---|---|
1. Enter system view. | system-view | N/A |
2. Enter Layer 2 Ethernet interface view or Layer 2 aggregate interface view. | interface interface-type interface-number | N/A |
3. Enable multicast group replacement on a port. | igmp-snooping overflow-replace [ vlan vlan-list ] | By default, multicast group replacement is disabled on a port. |