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Configuration Guide - IP Multicast

CloudEngine 8800, 7800, 6800, and 5800 V200R005C00

This document describes the configurations of IP multicast, including IP multicast basics, IGMP, MLD, PIM (IPv4), PIM (IPv6), MSDP, multicast VPN, multicast route management (IPv4), multicast route management (IPv6), IGMP snooping, MLD snooping, static multicast MAC address, multicast VLAN, multicast network management.
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IPv6 Layer 2 Multicast Takes Ineffective

IPv6 Layer 2 Multicast Takes Ineffective

Fault Description

When MLD snooping is not configured, multicast data is forwarded normally. After MLD snooping is configured, users cannot receive multicast data.

Procedure

  1. Check whether the MLD snooping version configured on the device is earlier than the version running on the user host.

    If the MLD snooping version configured on the device is earlier than the version running on the user host, the device only forwards MLD Report messages to router ports but does not generate group member ports and forwarding entries.

    Run the display mld snooping configuration command to check the MLD snooping configuration. If the MLD snooping version configured on the device is earlier than the version running on the user host, run the mld snooping version version command to make the device run the same MLD snooping version as the user host.

    NOTE:

    The CE6810LI does not support the mld snooping version version command, and can process only MLDv1 messages.

  2. Check whether the interval for sending MLD General Query messages configured on the local device is the same as that configured on the upstream device.

    If the interval for sending MLD General Query messages on the local device is smaller than that on the upstream MLD snooping querier or MLD snooping device, the local device may incorrectly age out some MLD snooping entries that are still in use. As a result, multicast packets matching these entries cannot be forwarded.

    Run the display mld snooping command to check MLD snooping parameters. If the interval for sending MLD General Query messages configured on the local device is smaller than that on the upstream MLD querier or MLD snooping device, run the mld snooping query interval query-interval command to increase the interval. It is recommended that the upstream and downstream devices use the same interval.

  3. Check whether dynamic learning of router ports is disabled.

    If dynamic learning of router ports is disabled, the device does not listen on MLD Query messages in a VLAN. In this case, router ports cannot be generated.

    Run the display mld snooping configuration command to check the configuration. If the command output contains "mld snooping router-learning disable", run the undo mld snooping router-learning disable command in the VLAN to enable dynamic learning of router ports in the VLAN.

  4. Check whether fast leave for interfaces is configured.

    The fast leave function can be configured for an interface only when the interface is connected to only one member host. If an interface is connected to multiple member hosts and fast leave is configured in the VLAN to which the interface belongs, the switch does not send a Group-Specific Query message and immediately deletes the forwarding entries of the interface when receiving an MLD Done message from the member port. This causes traffic forwarding interruption.

    Run the display mld snooping configuration command to check the configuration. If the command output contains "mld snooping prompt-leave", run the undo mld snooping prompt-leave command in the VLAN view to disable the fast leave function.

  5. Check whether the switch is configured to check the Router-Alert option in MLD messages.

    If the switch is configured to check the Router-Alert option in MLD messages, the switch checks the Router-Alert option in MLD messages and discards MLD messages without the Router-Alert option.

    Run the display mld snooping configuration command to check the configuration. If the command output contains "mld snooping require-router-alert", run the undo mld snooping require-router-alert command in the VLAN view to cancel the configuration.

  6. Check whether a multicast group policy is configured.

    If a multicast group policy is configured, the multicast group policy may limit the multicast groups that hosts in a VLAN can join. Run the display mld snooping configuration command to check the multicast group policy configuration. If ACL6 rules are configured, run the display acl ipv6 command to check whether ACL6 rules are correct.

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Updated: 2019-04-20

Document ID: EDOC1100039595

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