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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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A IPv6 PIM-DM Network Fails to Set Up an SPT

A IPv6 PIM-DM Network Fails to Set Up an SPT

Fault Description

After IPv6 PIM-DM configuration is complete on a network, user hosts use MLD to send VoD requests to group G. However, the user hosts cannot receive any multicast data.

Procedure

  1. Check whether a reachable IPv6 unicast route to the multicast source is available.

    Run the display ipv6 routing-table command to check whether the router has an IPv6 unicast route to the multicast source.

    IPv6 multicast routing depends on IPv6 unicast routing. If the router does not have an IPv6 unicast route to the multicast source, configure an IPv6 unicast routing protocol to dynamically generate a route or configure an IPv6 unicast static route to the multicast source.

  2. Check whether IPv6 PIM-DM is enabled on interfaces, especially the RPF interface towards the multicast source.

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

    If no IPv6 PIM information is displayed on an interface or the IPv6 PIM mode on the interface is sparse, PIM-DM is not enabled on the interface. Run the pim ipv6 dm command in the interface view to enable IPv6 PIM-DM.

  3. Check whether MLD is enabled on the interface directly connected to the network segment of the user hosts.

    Run the display mld interface command to check the MLD configuration on the interface directly connected to the network segment of the user hosts.

    If no information is displayed, MLD is not enabled on the interface. Run the mld enable command in the interface view to enable MLD.

  4. Check whether a source-based filtering policy is used on the router.

    Run the display current-configuration configuration pim command to check the current configuration in the PIM-IPv6 view.

    If the command output contains "source-policy acl6-number" or "source-policy acl6-name", a source-based filtering policy is configured. If the received multicast data is not in the range permitted by the IPv6 ACL, the router drops the multicast data. Run the undo source-policy command to delete the source-based filtering policy or configure new ACL rules to permit the multicast data requested by the user hosts.

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Updated: 2019-06-12

Document ID: EDOC1000097181

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