Configuring an MLD Snooping Policy 591c CAUTION: Make sure that the MLD query interval is greater than the maximumresponse time for MLD general queries; otherwise undesired deletion of IPv6multicast members may occur.Configuring Source IPv6Addresses of MLDQueriesThis configuration allows you to change the source IPv6 address of MLD queries.Follow these steps to configure source IPv6 addresses of MLD queries:c CAUTION: The source IPv6 address of MLD query messages may affect MLDquerier election within the segment.Configuring an MLDSnooping PolicyConfigurationPrerequisitesBefore configuring an MLD Snooping policy, complete the following tasks:■ Enable MLD Snooping in the VLANBefore configuring an MLD Snooping policy, prepare the following data:■ IPv6 ACL rule for IPv6 multicast group filtering■ The maximum number of IPv6 multicast groups that can pass the portsConfiguring an IPv6Multicast Group FilterOn a MLD Snooping-enabled switch, the configuration of an IPv6 multicast groupfilter allows the service provider to define limits of multicast programs available todifferent users.In an actual application, when a user requests a multicast program, the user’s hostinitiates an MLD report. Upon receiving this report message, the switch checks thereport against the configured ACL rule. If the port on which the report was heardcan join this IPv6 multicast group, the switch adds an entry for this port in the MLDSnooping forwarding table; otherwise the switch drops this report message. AnyIPv6 multicast data that fails the ACL check will not be sent to this port. In thisway, the service provider can control the VOD programs provided for multicastusers.Configuring an IPv6 multicast group filter globallyFollow these steps to configure an IPv6 multicast group globally:To do… Use the command… RemarksEnter system view system-view -Enter VLAN view vlan vlan-id -Configure the source IPv6address of MLD generalqueriesmld-snoopinggeneral-query source-ip{ current-interface |ipv6-address }OptionalFE80::02FF:FFFF:FE00:0001 bydefaultConfigure the source IPv6address of MLDmulticast-address-specificqueriesmld-snoopingspecial-query source-ip{ current-interface |ipv6-address }OptionalFE80::02FF:FFFF:FE00:0001 bydefault
