Apart from network virtualization, what are the characteristics of sdn compared with traditional communication networks?

SDN switches basically have the functions of ordinary switches. SDN switches are specially designed to support OpenFlow protocol (some support OpenFlow 1.0, and some strongly support 1.0 1.3). If you want to connect the switch, you need to change the required port to support the OpenFlow port and enter the IP address of the controller.

Call the controller (I use floodlight) to find an SDN switch (the port display is set to support OpenFlow port).

Key differences ~ ~ ~ ~ ~ ~ ~ ~ ~

Control products are sent to SDN switch according to the flow table rules, and data packets are forwarded by SDN switch. According to these flow table rules, traditional switches (at Layer 3 and Layer 2) receive packets and forward them according to their own judgment. For example, an SDN switch that is more traditional than (172. 1.88) in sending packets (172.1.89) first looks for the internal flow table (the table controller gives it to the ordinary switch) and does it according to the flow table (it can achieve the function better than changing the source address or sensing who to send the data packet copy to); The control packet is not sent, but some information is requested from the controller to process the packet.

I feel that the efficiency of SDN switch is not as high as usual. I hope it can develop. ...