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Configuration Guide - IP Multicast

S7700 and S9700 V200R010C00

This document describes IP multicast basics and how to configure IP multicast features, including IGMP/MLD, PIM (IPv4&IPv6), MSDP, multicast VPN, Layer 3 multicast CAC, Layer 2 multicast CAC, IGMP/MLD snooping, and multicast VLAN, IPv4&IPv6 multicast route management, static multicast MAC address, multicast network.
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IGMP Entries Cannot Be Created

IGMP Entries Cannot Be Created

Fault Description

After IGMP configuration is complete, hosts request data of multicast group G. However, the last-hop multicast device does not create any IGMP entries.

Procedure

  1. Check whether the requested group address is in the range of reserved group addresses (224.0.0.1 to 224.0.0.255). When receiving IGMP Report messages with destination addresses in this range, the switch does not generate IGMP entries.
  2. Run the display interface interface-type interface-number command to check whether the interface directly connected to the host network segment is Up.

    If the interface is Down, check whether the interface is correctly connected, whether it has been shut down using the shutdown command, and whether it has a correct IP address configured.

  3. Run the display current-configuration command to check whether multicast routing is enabled.

    If the command output does not contain "multicast routing-enable", run the multicast routing-enable command in the system view to enable multicast routing.

  4. Run the display current-configuration interface interface-type interface-number command to check whether IGMP is enabled on the interface directly connected to the host network segment.

    If the command output does not contain igmp enable, run the igmp enable command in the interface view to enable IGMP.

  5. Run the display igmp [ vpn-instance vpn-instance-name | all-instance ] interface interface-type interface-number command to check whether the IGMP configuration on the interface is correct.

    • The IGMP version running on the interface (identified by Current IGMP version in the command output) must be later than or the same as the IGMP version running on the hosts.
    • If the IGMP group policy field displays an ACL rule, check whether the multicast group address is rejected by the ACL rule. If so, modify the ACL rule to allow the multicast device to receive Report messages of this multicast group.

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Updated: 2019-08-21

Document ID: EDOC1000141903

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