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Configuration Guide - IP Multicast

CloudEngine 12800 and 12800E V200R005C10

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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Configuring an MLD Query Message Filtering Policy

Configuring an MLD Query Message Filtering Policy


If an attacker sends Query messages with a smaller querier IP address than the real MLD querier on the network, switches running MLD snooping consider the attacker as a querier and forward MLD Report messages to the attacker. In this case, multicast traffic cannot be forwarded correctly. You can configure an MLD Query message filtering policy to defend against such attacks. An MLD Query message filtering policy permits only MLD Query messages with specified source IP addresses and rejects other MLD Query messages. This improves security of a Layer 2 multicast network.

An MLD Query message filtering policy must reference an ACL6. MLD Query messages are accepted only when their source IP addresses are permitted by the referenced ACL6 (within the address range following permit in the ACL6 rule). For details about ACL6 configuration, see "ACL Configuration" in the CloudEngine 12800 and 12800E Series Switches Configuration Guide - Security.


  1. Run system-view

    The system view is displayed.

  2. Run vlan vlan-id

    The VLAN view is displayed.

  3. Run mld snooping query ip-source-policy { acl6-number | acl6-name acl6-name }

    An MLD Query message filtering policy is configured.

    By default, no MLD Query message filtering policy is configured in a VLAN.

  4. Run commit

    The configuration is committed.

Updated: 2019-04-20

Document ID: EDOC1100074724

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