enCBS: Delay Guarantee Mechanism based on Credit-based Shaping for Programmable Switch

The Time-Sensitive Networking (TSN) aims to achieve delay guarantee through traffic shaping, and the programmable switch provides a data plane implementation solution for the flexible and deployable TSN network. However, the built-in quality of service guarantee mechanism of the current programmable switch cannot satisfy the deterministic guarantee of queue control and end-to-end delay of TSN network. Credit-based Shaping (CBS) is a common traffic shaping scheme for static TSN network, and it is helpless in the face of topology changes and dynamic entry/exit of flows. In this paper, we design the enhance CBS (enCBS), a CBS-based delay guarantee mechanism on the programmable switch, using the advantages of Software-Defined Network (SDN) architecture to optimize flow management and parameter configuration. In addition, we improved the traditional CBS and strengthened the packet interval constraints. The experimental results prove that, compared with the existing quality of service control mechanism of programmable switch, the delay guarantee mechanism based on CBS shaping has better delay guarantee performance.