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CLI-based Configuration Guide - IP Multicast

AR100, AR120, AR160, AR1200, AR2200, AR3200, and AR3600 V300R003

This document provides the basic concepts, configuration procedures, and configuration examples of the interfaces supported by the device.
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Adjusting Assert Control Parameters

Adjusting Assert Control Parameters

Pre-configuration Tasks

Configuring Basic PIM-DM Functions

Context

When multiple PIM devices on a network segment pass the reverse path forwarding (RPF) check and forward multicast data to this network segment, assert election is required. When a device receives multicast data through a downstream interface, it knows that other upstream devices exist on this network segment. The device then sends an Assert message to participate in the election of the unique upstream device.

PIM devices that fail the assert election disable their downstream interfaces from forwarding multicast data to this network segment. The assert loser state lasts for a period, which is called the holdtime of Assert messages. After the assert state timer times out, the devices that lost the Assert election restore pruned interfaces to the forwarding state to trigger a new round of Assert election.

NOTE:

The holdtime of Assert messages can be configured globally or on an interface. If you configure the holdtime of Assert messages in the global PIM view and in the interface view simultaneously, the configuration in the interface view takes effect.

Default Settings

The default holdtime of Assert messages is 180s.

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 holdtime assert interval

      The holdtime of Assert messages 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. Run pim holdtime assert interval

      The period for holding the Assert state is configured.

Verifying the Configuration

After assert control parameters are configured, you can check information about the PIM interface, PIM neighbors, and PIM routing table using the following commands:

  • 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.

  • Run the following commands to check the PIM routing table:

    • Run the display pim [ vpn-instance vpn-instance-name | all-instance ] routing-table [ group-address [ mask { group-mask-length | group-mask } ] | source-address [ mask { source-mask-length | source-mask } ] | incoming-interface { interface-type interface-number | register } | outgoing-interface { include | exclude | match } { interface-type interface-number | register | none } | mode { dm | sm | ssm } | flags flag-value | fsm ] * [ outgoing-interface-number [ number ] ] command to check detailed information about the PIM routing table.

    • Run the display pim [ vpn-instance vpn-instance-name | all-instance ] routing-table brief [ group-address [ mask { group-mask-length | group-mask } ] | source-address [ mask { source-mask-length | source-mask } ] | incoming-interface { interface-type interface-number | register } ] * command to check brief information about the PIM routing table.

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Updated: 2019-03-06

Document ID: EDOC1100069332

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