Network situation awareness efficiency: In addition to network configuration, network situation awareness plays an important role in the network management. Network situation awareness requires the in-time perception of the network state (including the failures, attacks and other anomalies),orientation, reasoning and diagnosis, and ultimately making
appropriate response. However, because the management information transmission depends on the forwarding plane in
current networks, the management information can not be timely delivered when congestion or link/node failures events
happen. And this makes it difficult to effectively collect network status, makes it difficult to effectively detect and
locate network anomalies, and makes it difficult to respond in a timely manner.