| 主权项 |
1. A method, in a data processing system comprising a processor and a memory and implementing a software defined network (SDN) controller, for tracing a route taken by a packet in a SDN, the method comprising:
assigning, by the SDN controller, each switch in the SDN a first color label, from a set of color labels, such that adjacent switches have different color labels; installing, by the SDN controller, one or more rules in each switch to forward a received data packet to the SDN controller in response to a second color label of the received data packet not matching the first color label assigned to the switch; assigning, by the SDN controller, a second color label, from the set of color labels, to a trace data packet; and tracing, by the SDN controller, a route of the trace data packet through the SDN based on the second color label and application of the one or more rules to the trace data packet at each of the switches in the SDN as the trace data packet is received by each of the switches in the SDN. |
