The Surveillance Director is the component that manages the process of selecting subscriber traffic to be monitored and activating SRC services to direct specified traffic to an IDP sensor (IDP hardware appliances that run the IDP sensor software). It divides subscribers into groups, then directs traffic for one group at a time through IDP. This means that IDP monitors different groups of traffic at different times, and that traffic for SRC-managed subscribers is periodically monitored. The Surveillance Director relies on SRC services to policy-route traffic from JUNOSe routers or to mirror traffic from JUNOS routing platforms to the IDP sensor.