To allow multicast traffic to be sent to the Adaptive Services or Multiservices PIC, include the allow-multicast statement at the [edit services service-set service-set-name] hierarchy level. If this statement is not included, multicast traffic is dropped by default. This statement applies only to multicast traffic using a next-hop service set; interface service set configuration is not supported. Only unidirectional flows are created for multicast packets. For a configuration example, see Example: Configuring NAT for Multicast Traffic.