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    Specifying MLD Multicast Groups

    You can use a standard IPv6 access list to specify the multicast groups that a host can join.

    To restrict the host to join only the groups permitted by the IPv6 access list:

    • Restrict hosts on this subnetwork to join only multicast groups on the specified IPv6 access list. The access list is queried whenever the router receives an MLDv1 report requesting membership of a group and MLDv2 ChangeToInclude, IsInclude, ChangeToExclude, or IsExclude reports. The request is ignored if the access list query fails. The ipv6 mld access-group command uses IPv6 access lists, which allow both source and destination/group addresses to be specified. You must set the source address to any.
      host1:boston(config-if)#ipv6 mld access-group boston-list

      Use the no version to dissociate the interface from an access list and to allow hosts on the interface to join any multicast group.

      Note: As an alternative method, you can restrict the hosts using the MLD-Access-Name RADIUS attribute (VSA 26-74) in RADIUS Access-Accept messages. The radius ignore command is used to ignore or accept RADIUS attributes from Access-Accept messages.

    • Restrict hosts on this subnetwork to membership only in (S,G) pairs (also known as channels) permitted by the specified IPv6 access list. When configured, both source and group addresses query the associated access list whenever the router receives an MLDv2 report requesting membership of the (S,G) pairs (that is, the router receives an MLDv2 ChangeToInclude, IsInclude, or AllowNewSource group report). The request is ignored if the access list query fails. The ipv6 mld access-source-group command uses IPv6 access lists, which allow both source and destination group addresses to be specified.
      host1:boston(config-if)#ipv6 mld access-source-group dallas-list

      Use the no version to remove any access list restriction.

      Note: As an alternative method, you can restrict the hosts using the MLD-Access-Src-Name RADIUS attribute (VSA 26-75) in RADIUS Access-Accept messages. The radius ignore command is used to ignore or accept RADIUS attributes from Access-Accept messages.

    Published: 2014-08-19