Configuring Control Parameters for Prune

The control parameters for prune can be set either globally or on an interface. The parameters specify the delay for transmitting messages in a LAN and the interval for overriding the Prune action.

Context

The configuration involves the following cases:

Global Configuration: It is valid on all the interfaces.
Configuration on the interface: The configuration on an interface takes precedence over the global configuration. If the configuration on an interface is not done, the global configuration is used.

Procedure

Global Configuration
1. Access the system view.
  system-view
2. Access the PIM view.
  pim [ vpn-instance vpn-instance-name ]
3. Set the delay for transmitting messages in a LAN.
  hello-option lan-delay interval
  
  A Hello message carries lan-delay and override-interval. PPT indicates the delay from the time when a FW receives the Prune message from a downstream interface to the time when the FW performs the prune action to suppress the forwarding of the downstream interface. The PPT is obtained by the lan-delay plus override-interval. If the FW receives a Join message from a downstream FW within the PPT, the FW does not perform the prune action.
4. Set the interval for overriding the Prune action.
  hello-option override-interval interval
  
  When a FW sends a Prune message to the upstream FW in the same network segment, if other FW still requests the multicast data, it needs to send a Join message to the upstream FW in the override-interval period.
Configuration on an Interface
1. Access the system view.
  system-view
2. Access the interface view.
  interface interface-type interface-number
3. Set the delay for transmitting messages in a LAN.
  pim hello-option lan-delay interval
4. Set the interval for overriding the Prune action.
  pim hello-option override-interval interval