Setting the Maximum Number of Downstream Nodes of a Multicast Forwarding Entry

A multicast device replicates a copy of multicast packets for each downstream interface. Then, you can set the number of downstream interfaces of a single forwarding entry and adjust the number of downstream interfaces according to the actual networking and service performance to release the burden on the multicast device.

Prerequisites

Before setting the maximum number of downstream nodes of multicast forwarding entry, complete the following tasks:

Configuring a unicast routing protocol
Configuring basic multicast functions

Context

This configuration becomes valid only after the reset multicast forwarding-table command is used. Multicast services are interrupted after you run the reset multicast forwarding-table command. So, confirm the action before you use the command.

Configurations related to the VPN instance are applicable only to the PE device. When configuring the maximum number of downstream nodes for a forwarding entry in a VPN instance on a PE, perform the configuration in the VPN instance. In other cases, the maximum number of entries in the forwarding table is configured in the public network instance.

Procedure

Public network instance
1. Access the system view.
  system-view
2. Set the maximum number of downstream nodes of a forwarding entry in the multicast forwarding table.
  multicast forwarding-table downstream-limit limit
  
  The maximum number is valid when it is smaller than the default value.
VPN instance
1. Access the system view.
  system-view
2. Access the VPN instance view.
  ip vpn-instance vpn-instance-name
3. Enable the IPv4 address family for the VPN instance and access the VPN instance IPv4 address family view.
  ipv4-family
4. Set the maximum number of downstream nodes of a forwarding entry in the multicast forwarding table.
  multicast forwarding-table downstream-limit limit