SDN Reactive, Proactive, Predictive Models 정리

Reactive, Proactive, Predictive SDN Models 

SDN(Software Defined Networking) Controller는 OpenFlow를 지원하는 스위치에 Flow Table을 이용하여 패킷을 처리하는 방법을 결정한다.

SDN Controller마다 패킷을 처리하는 방식이 다르다. Controller가 패킷을 처리하는데 있어서 크게 3가지 방법, Reactive, Proactive, Predictive로 분류된다. 

1. Reactive

Reactive models are those we generally associate with SDN and OpenFlow. Reactive models are constantly adjusting and are in flux as changes are made immediately as a reaction to current network conditions. This is the base volatility management model in which there is a high rate of change in the location of end-points (usually virtual machines) and OpenFlow is used to continually update the location and path through the network to each end-point. 

2. Proactive 

Proactive models anticipate issues in the network and attempt to address them before they become a real problem (which would require reaction). Proactive models can be based on details such as increasing utilization in specific parts of the network, indicating potential forthcoming bottlenecks. Making changes to the routing of data through the network before utilization becomes too high can mitigate potential performance problems.

3. Predictive

A predictive approach uses historical data regarding the performance of the network to adjust routes and flows periodically. This approach is less disruptive as it occurs with less frequency that a reactive model but still allows for trends in flow and data volume to inform appropriate routes.