Configuring the Interval for Sending Hello Messages

The interval for sending Hello messages can be set either globally or on an interface. The configuration in the interface view is prior to the configuration in the PIM view. When the interval is not configured in the interface view, the configuration in the PIM view takes effect.

Prerequisites

Before adjusting control parameters for maintaining neighbor relationships, complete the following tasks:

Configuring a unicast routing protocol
Configuring Basic PIM-DM Functions

Context

The configuration involves the following cases:

Global configuration: It is valid on each interface.
Configuration on an 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 Hello messages.
  timer hello 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 Hello messages.
  pim timer hello interval
4. Set the maximum delay for triggering Hello messages.
  pim triggered-hello-delay interval
  
  After the maximum delay is set, the conflict caused by multiple PIM devices sending Hello messages simultaneously is prevented.