A monitoring system (100) for a software defined network (190), SDN, comprising at least one monitored device (191) is provided. The monitoring system (100) comprises at least one monitoring instance (104), which is a hardware or software monitoring component being adapted to operate at least one probe (105) for monitoring the at least one monitored device (191). The monitoring system (100) further comprises a monitoring orchestrator (101) and at least one sub-monitoring-orchestrator (102). The monitoring orchestrator (101) is adapted to determine at least one first parameter to be monitored according to a monitoring request and to orchestrate monitoring the at least one first parameter. The at least one sub- monitoring-orchestrator (102) is adapted to determine at least one second parameter to be monitored according to the at least one first parameter and orchestrate monitoring the at least one second parameter.