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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 Assert Control Parameters

Adjusting Assert Control Parameters

Pre-configuration Tasks

Before configuring assert control parameters, complete the following task:

Configuring Basic IPv6 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, the device 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-IPv6 view and in the interface view simultaneously, the configuration in the interface view takes effect.

Default Configuration

Table 5-9 lists default configuration of assert control parameters.

Table 5-9  Default configuration of assert control parameters
Parameter Default Setting

Period for holding the Assert state

180s

Procedure

  • Global configuration
    1. Run:

      system-view

      The system view is displayed.

    2. Run:

      pim-ipv6

      The PIM-IPv6 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 ipv6 holdtime assert interval

      The period for holding the Assert state is configured.

Checking the Configuration

After assert control parameters are configured, you can check information about the IPv6 PIM interface, IPv6 PIM neighbor, and IPv6 PIM routing table using the following commands:

  • Run the display pim ipv6 interface [ interface-type interface-number | up | down ] [ verbose ] command to check IPv6 PIM information on an interface.

  • Run the display pim ipv6 control-message counters [ message-type { assert | graft | graft-ack | hello | join-prune | state-refresh | bsr } | interface interface-type interface-number ] * command to check information about IPv6 PIM neighbors.

  • Run the following commands to check the IPv6 PIM routing table:

    • Run the display pim ipv6 routing-table [ ipv6-source-address [ mask mask-length ] | ipv6-group-address [ mask mask-length ] | flags flag-value | fsm | incoming-interface { interface-type interface-number | register } | mode { dm | sm | ssm } | outgoing-interface { exclude | include | match } { interface-type interface-number | none | register } ] * [ outgoing-interface-number [ number ] ] command to check detailed information about the IPv6 PIM routing table.

    • Run the display pim ipv6 routing-table brief [ ipv6-source-address [ mask mask-length ] | ipv6-group-address [ mask mask-length ] | incoming-interface { interface-type interface-number | register } ] * command to check brief information about the IPv6 PIM routing table.

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Updated: 2019-06-12

Document ID: EDOC1000097181

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