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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 Multicast Source Control Parameters

Adjusting Multicast Source Control Parameters

Pre-configuration Tasks

Before setting the parameters for controlling a multicast source, complete the following tasks:

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

Context

After a PIM device receives a multicast packet from a multicast source, it starts a timer for the (S, G) entry and sets the timer to the multicast source lifetime. If the device receives a packet from the source before the timer expires, it resets the timer. If the device does not receive any multicast packet from the source within the lifetime, it considers the corresponding (S, G) entry invalid and deletes this entry. You can configure the multicast source lifetime.

To control multicast traffic or ensure data security, configure source address-based filtering policies on the device so that the device accepts only multicast data allowed by the policies.

Default Configuration

Table 4-14 lists default configuration of multicast source control parameters.

Table 4-14  Default configuration of multicast source control parameters
Parameter Default Setting

Keepalive period of a multicast source

210s

Source address filtering policy

No policy configured (Multicast data from all sources is accepted.)

Procedure

  1. Run:

    system-view

    The system view is displayed.

  2. Run:

    pim [ vpn-instance vpn-instance-name ]

    The PIM view is displayed.

  3. Run:

    source-lifetime interval

    The multicast source lifetime is configured.

  4. Run:

    source-policy { acl-number | acl-name acl-name }

    A multicast source address-based filtering policy is configured.

    • If a basic ACL is specified in the command, the allowed multicast packets are specified by the source parameter in the rule configured under the basic ACL. The device forwards only the multicast packets with the source addresses allowed by the filtering policy.

    • If an advanced ACL is specified in the command, the allowed multicast packets are specified by source and destination parameters in the rule configured under the advanced ACL. The device forwards only the multicast packets with both source addresses and group addresses allowed by the filtering policy.

    • If the specified ACL contains no rule, the device does not forward multicast packets from any sources.

    • This command does not filter multicast packets that match the PIM entries generated from statically configured IGMP (S, G) entries.

Checking the Configuration

After the control parameters of a multicast source are adjusted, you can check entries in the PIM routing table.

Run the following commands to check the PIM routing table.
  • 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 ] ]

  • 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 } ] *

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Updated: 2019-06-12

Document ID: EDOC1000097181

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