Configuring Control Parameters for Keeping the Forwarding State

The control parameters of multicast data forwarding can be set either globally or on an interface. The parameters specify the interval for sending Join/Prune messages and the period for a downstream interface to keep the Join/Prune state.

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 interval for sending Join/Prune messages.
  timer join-prune interval
4. Set the interval for holding the Join/Prune state of a downstream interface.
  holdtime join-prune interval
Configuration on an Interface
1. Access the system view.
  system-view
2. Access the interface view.
  interface interface-type interface-number
3. Set the interval for sending Join/Prune messages.
  pim timer join-prune interval
4. Set the interval for holding the Join/Prune state of a downstream interface.
  pim holdtime join-prune interval
5. Contain the Generation ID option in a received Hello message.
  pim require-genid
  
  The Hello message without the Generation ID option is rejected.
  
  By default, the FW handles the Hello message without the Generation option.
  
  The change of the Generation ID in the Hello message received from an upstream neighbor indicates that the upstream neighbor is lost or the status of the upstream neighbor has changed. The FW immediately sends the Join/Prune message to the upstream FW to refresh the status.