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NE40E V800R010C10SPC500 Configuration Guide - IP Multicast 01

This is NE40E V800R010C10SPC500 Configuration Guide - IP Multicast
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(Optional) Modifying Graft Control Parameters

(Optional) Modifying Graft Control Parameters

This section describes how to modify graft control parameters. You can configure the interval at which Graft messages are sent according to the actual situation.


On a PIM-DM network, if State-Refresh is enabled on pruned interfaces, it is possible that the forwarding function will never be restored. When a new multicast member is added to a pruned interface, PIM-DM uses the graft mechanism to restore the forwarding function on the interface to save time. In other words, a router sends a Graft message to require an upstream router to forward multicast data to this network segment. When the upstream router receives the Graft message, it returns a Graft-Ack message and re-enables the forwarding function on the interface that received the Graft message. If the router does not receive the Graft-Ack message during the configuration period, it will keep sending the same Graft message before it receives the Graft-Ack message from the upstream device. If there is no special requirement, default values are recommended.


  1. Run system-view

    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 interval at which Graft messages are retransmitted is configured.

    By default, the interval at which Graft messages are retransmitted is 3 seconds.

  4. Run commit

    The configuration is committed.

Updated: 2019-01-03

Document ID: EDOC1100055017

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