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CLI-based Configuration Guide - IP Multicast

AR120, AR150, AR160, AR200, AR1200, AR2200, AR3200, and AR3600 V200R007

This document describes the principles and configurations of IP multicast, and provides configuration examples.
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Adjusting Graft Control Parameters

Adjusting Graft Control Parameters

Pre-configuration Tasks

Configuring Basic PIM-DM Functions


To quickly resume multicast forwarding to a pruned network segment, the router sends a Graft message to its upstream neighbor and starts a timer on the upstream interface. If the router does not receive multicast data when the timer expires, it retransmits the Graft message to the upstream neighbor. You can control multicast packet forwarding by adjusting the graft control parameters to meet requirements in various scenarios.

Default Configuration

The default retransmission interval of Graft messages is 3s.


  1. Run:


    The system view is displayed.

  2. Run:

    interface interface-type interface-number

    The interface view is displayed.

  3. Run:

    pim timer graft-retry interval

    The retransmission interval of Graft messages is configured.

Checking the Configuration

After adjusting the retransmission interval of Graft messages on an interface, check PIM-DM graft information and PIM information on the interface to see whether the configuration meets the service requirements.

  • Run the display pim [ vpn-instance vpn-instance-name | all-instance ] interface [ interface-type interface-number | up | down ] [ verbose ] command to check PIM information on an interface.

  • Run the display pim [ vpn-instance vpn-instance-name | all-instance ] grafts command to check information about PIM-DM Graft messages that have not been acknowledged by the upstream neighbor.

Updated: 2019-06-12

Document ID: EDOC1000097181

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