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S600-E V200R012C00 Configuration Guide - IP Multicast

This document describes the configurations of IP multicast, including IGMP snooping, MLD snooping, static multicast MAC address, multicast VLAN replication, controllable multicast, multicast network management.
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Layer 2 Multicast Configuration Fails to Take Effect

Layer 2 Multicast Configuration Fails to Take Effect

Fault Description

Multicast data is forwarded normally. After Multicast Listener Discovery (MLD) snooping is configured, users cannot receive multicast data.

Procedure

  1. Check whether the MLD snooping version configured on the switch is earlier than that running on user hosts.

    If the MLD snooping version configured on the switch is earlier than that running on user hosts, the switch only forwards MLD Report messages to router ports and 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 switch is earlier than that running on user hosts, run the mld-snooping version version command to set the same MLD version as user hosts.

  2. Check whether the general query interval configured on the local switch is the same as that of the upstream device.

    If the general query interval on the local switch is smaller than that of the upstream MLD querier or MLD snooping device, the local switch 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 general query interval on the local switch is smaller than the general query interval 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 general query interval.

  3. Check whether fast leave for interfaces is configured.

    Fast leave can be configured in a VLAN only when each interface in the VLAN is connected to only one host. If an interface is connected to multiple hosts and fast leave is configured in the VLAN to which the interface belongs, the switch does not send Query message and immediately deletes the forwarding entries of the interface after receiving an MLD Done message from the interface. 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.

  4. Check whether Router-Alert option checking is configured.

    If the switch is configured to check Router-Alert option, the switch checks for the Router-Alert option in MLD packets and discards packets without the 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 delete the configuration.

  5. Check whether a multicast group policy is configured.

    The multicast group policy limits the multicast groups that the hosts in a VLAN can join. Run the display mld-snooping configuration command to verify the multicast group policy configuration. If IPv6 access control list (ACL6) rules are configured, run the display acl ipv6 command to check whether ACL6 rules are correctly configured.

  6. Check whether Layer 2 multicast filtering is configured on the interface.

    The Layer 2 multicast filtering functions filters UDP packets form certain VLANs. This causes interruption in Layer 2 multicast traffic forwarding.

    Run the undo multicast-source-deny vlan command in the interface view to disable the Layer 2 multicast filtering function.

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Updated: 2018-09-01

Document ID: EDOC1100037948

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