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Configuration Guide - IP Multicast

S7700 and S9700 V200R010C00

This document describes IP multicast basics and how to configure IP multicast features, including IGMP/MLD, PIM (IPv4&IPv6), MSDP, multicast VPN, Layer 3 multicast CAC, Layer 2 multicast CAC, IGMP/MLD snooping, and multicast VLAN, IPv4&IPv6 multicast route management, static multicast MAC address, multicast network.
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Adjusting Graft Control Parameters

Adjusting Graft Control Parameters

Pre-configuration Tasks

Configuring Basic PIM-DM Functions

Context

To quickly resume multicast forwarding to a pruned network segment, the switch sends a Graft message to its upstream neighbor and starts a timer on the upstream interface. If the switch does not receive multicast data before the timer expires, it retransmits the Graft message to the upstream neighbor. Multicast packet forwarding can be controlled by adjusting the graft control parameters.

Default Configuration

The default retransmission interval of Graft messages is 3s.

Procedure

  1. Run:

    system-view

    The system view is displayed.

  2. Run:

    interface interface-type interface-number

    The interface view is displayed.

  3. (Optional) On an Ethernet interface, run undo portswitch

    The interface is switched to Layer 3 mode.

    By default, an Ethernet interface works in Layer 2 mode.

  4. 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 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.

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Updated: 2019-08-21

Document ID: EDOC1000141903

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