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CX11x, CX31x, CX710 (Earlier Than V6.03), and CX91x Series Switch Modules V100R001C10 Configuration Guide 12

The documents describe the configuration of various services supported by the CX11x&CX31x&CX91x series switch modules The description covers configuration examples and function configurations.
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Common Configuration Errors

Common Configuration Errors

This section describes common faults caused by incorrect IGMP snooping configurations and provides the troubleshooting procedure.

Layer 2 Multicast Packets Cannot Be Forwarded

Fault Description

Multicast packets can be forwarded normally when IGMP snooping is not configured. However, users cannot receive multicast packets after IGMP snooping is configured.

Procedure

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

    If the IGMP snooping version configured on the device is earlier than that running on user hosts, the device only forward IGMP Report messages to router ports and does not generate group member ports and forwarding entries.

    Run the display igmp snooping configuration command to check the IGMP snooping configuration. If the IGMP snooping version configured on the device is earlier than that running on user hosts, run the igmp snooping version version command to make the device run the same IGMP version as user hosts.

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

    If the general query interval on the local device is smaller than the general query interval on the upstream IGMP querier or IGMP snooping device, the local device may mistakenly age out some IGMP snooping entries that are still in use. As a result, multicast packets matching these entries cannot be forwarded.

    Run the display igmp snooping command to check IGMP snooping parameters. If the general query interval on the local device is smaller than the general query interval on the upstream IGMP querier or IGMP snooping device, run the igmp snooping query-interval query-interval command to increase the IGMP snooping general query interval. It is recommended that the upstream and downstream devices use the same general query interval.

  3. Check whether router port dynamic learning is disabled.

    The switch modules does not listen to IGMP Query messages in a VLAN after router port dynamic learning is disabled in the VLAN.

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

  4. Check whether fast leave for member ports is enabled.

    Configure fast leave in a VLAN only when each interface in the VLAN connects to only one host. If a member port is connected to multiple hosts and fast leave for member ports is enabled in the VLAN, the switch modules immediately deletes the forwarding entry of the member port after receiving an IGMP Leave message from the member port, and does not send a Group-Specific Query message. Therefore, multicast packets cannot be forwarded.

    Run the display igmp snooping configuration command to check whether fast leave for member ports is enabled. If the command output contains "igmp snooping prompt-leave", run the undo igmp snooping prompt-leave command in the VLAN view to disable the fast leave function.

  5. Check whether the Router-Alert option is configured.

    If the Router-Alert option is configured, the switch modules checks the Option field of IGMP messages to discard messages without the Router-Alert option.

    Run the display igmp snooping configuration command to check whether the Router-Alert option is configured. If the command output contains "igmp snooping require-router-alert", run the undo igmp snooping require-router-alert command in the VLAN view to delete the related configuration.

  6. 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 igmp snooping configuration command to verify the configuration of multicast group policy. If an ACL rule is configured, run the display acl command to verify the configuration of ACL rule.

  7. Check whether the Layer 2 multicast filtering function is configured.

    If the Layer 2 multicast filtering function is configured on the interface, the interface discards the UDP packets from the specified VLAN.

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

The Multicast Group Policy Does Not Take Effect

Fault Description

A multicast policy is configured on the switch modules to allow the hosts to join the specified multicast groups. However, the hosts can still receive multicast data sent to other multicast groups.

Procedure

  1. Run the display acl command to check whether the ACL rules conflict with the multicast group policy.
  2. Run the display igmp snooping configuration command to check whether a correct multicast group policy is applied in the VLAN. If not, run the igmp snooping group-policy command to apply a correct multicast group policy in the VLAN.
  3. Run the display current-configuration | include drop-unknown command to check whether the switch modules is enabled to discard unknown multicast packets. If not, run the multicast drop-unknown command to enable the switch modules to discard unknown multicast packets.
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Updated: 2019-08-09

Document ID: EDOC1000041694

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