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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 Control Parameters for DR Election

Adjusting Control Parameters for DR Election

Pre-configuration Tasks

Before configuring control parameters for DR election, complete the following tasks:

  • Configure a unicast routing protocol to ensure normal unicast routing on the network.
  • Enable PIM-SM.

Configuration Process

Configuration tasks in this section can be performed in any sequence.

Configuring the DR Priority

Context

The shared network segment where a multicast source or group member resides is usually connected to multiple PIM devices. PIM devices exchange Hello messages to elect a designated router (DR) on the network segment, which is the unique sender of multicast packets. The DR priorities carried in Hello messages are compared at first. The device with the highest DR priority wins (A greater value indicates a higher priority). If PIM devices have the same DR priority or at least one PIM device does not support Hello messages carrying the DR priority, the PIM device with the largest IP address wins.

NOTE:

The DR priority can be configured globally or on an interface. If this parameter is configured in both the global PIM view and interface view, the configuration in the interface view takes effect.

Default Configuration

The default DR priority is 1.

Procedure

  • Global configuration
    1. Run:

      system-view

      The system view is displayed.

    2. Run:

      pim [ vpn-instance vpn-instance-name ]

      The PIM view is displayed.

    3. Run:

      hello-option dr-priority priority

      The priority for DR election is configured.

  • Configuration on an interface
    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 hello-option dr-priority priority

      The priority for DR election is configured.

Configuring the DR Switchover Delay

Context

When an interface on a shared network segment changes from a designated router (DR) to a non-DR, PIM devices on the network segment immediately delete the related multicast forwarding entries. This causes loss of multicast data in a short period. To avoid such a situation, enable DR switching delay function and set a delay time. When the DR changes, the original multicast forwarding entries are retained within the delay time.

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 dr-switch-delay interval

    The DR switchover delay function is enabled and a delay time is configured.

    By default, when the interface changes from a DR to a non-DR, the interface stops forwarding data immediately.

Checking the Configuration

Prerequisites

After the control parameters for electing a DR are adjusted, you can check information about the PIM interface and the PIM neighbor.

Procedure

  • 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 ] neighbor [ neighbor-address | interface interface-type interface-number | verbose ] * command to check information about PIM neighbors.
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Updated: 2019-08-21

Document ID: EDOC1000141903

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