The multicast ipv6 forwarding-table downstream-limit command sets the maximum number of downstream nodes of an entry in the IPv6 multicast forwarding table.
The undo multicast ipv6 forwarding-table downstream-limit command restores the default setting.
By default, the maximum number of downstream nodes of an entry is 128.
multicast ipv6 forwarding-table downstream-limit limit
undo multicast ipv6 forwarding-table downstream-limit
| Parameter | Description | Value |
|---|---|---|
| limit | Indicates the maximum number of downstream nodes of an entry in the forwarding table. | The value is an integer that 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 IPv6 multicast forwarding entry. If the switch has a large number of IPv6 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 IPv6 multicast forwarding entry.
Prerequisites
IPv6 multicast routing has been enabled globally using the multicast ipv6 routing-enable command in the system view.
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 IPv6 multicast routing protocol. In addition, no new downstream node can be added to the entry in the forwarding table.