The multicast forwarding-table downstream-limit command sets the maximum number of downstream nodes of an entry in the multicast forwarding table.
The undo multicast forwarding-table downstream-limit command restores the default setting.
By default, the maximum number of downstream nodes of an entry is 128.
multicast forwarding-table downstream-limit limit
undo multicast forwarding-table downstream-limit
| Parameter | Description | Value |
|---|---|---|
| limit | Indicates the maximum number of downstream nodes of an entry in the forwarding table. | The value of ranges from 0 to 128. |
Usage Scenario
When the switch receives a multicast packet, it copies the packet for each downstream node in the matching multicast forwarding entry. If the switch has a large number of multicast forwarding entries or each entry has many downstream nodes, many system resources are consumed. To reduce the load on the switch, limit the maximum number of downstream nodes in each multicast forwarding entry.
Prerequisites
IP multicast routing has been enabled using the multicast routing-enable command.
Precautions
If the configured number is smaller than the current number, the excessive downstream nodes are not deleted immediately, and must be deleted by the multicast routing protocol. In addition, no new downstream node can be added to the entry in the forwarding table.