Research Article
[Retracted] An Adaptive Authenticated Model for Big Data Stream SAVI in SDN-Based Data Center Networks
Table 2
Typical OFPT messages between the controller and switch.
| OFPT message | Communication type | Message description |
| Hello | Controller to switch | The SDN controller sends its information as identity number to the access layer switch following the corresponding TCP handshake. | Hello | Switch to controller | Supported switch information is replied. | Features request | Controller to switch | The SDN controller requires for validating, which ports on the access layer switch are trusted and available. | Set config | Controller to switch | The SDN controller requires the access layer switch to send flow expired timestamp. | Features reply | Switch to controller | List of flow table match fields (ports, port speeds, supported tables, and actions) is replied by the access layer switches. | Port status | Switch to controller | Enables the access layer switch to inform that SDN controller of flow changes to port speeds or connectivity. |
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