ASIC芯片中BFD定时器协商机制改进设计与实现

描述了在电信级以太网芯片中实现BFD快速检测与定时器协商机制的逻辑设计过程，并将硬件逻辑在FPGA仿真芯片中进行了验证。验证了单纯硬件逻辑实现BFD定时器协商机制的可行性，该机制使用软硬件联合设计的改进方法，能够在节约硬件资源的前提下，发挥硬件的速度优势和软件的灵活优势，实现可靠的BFD时间协商过程与快速检测机制。此改进设计经过使用软件和硬件的联合验证，结果表明能够达到预期的效果，并能够实现商业应用。

An Improved Design of BFD Timer Negotiation Mechanism in ASIC Hardware

This paper describes an improved design of BFD fast detection and timer negotiation in ASIC. We first provide the basic design of timer negotiation in hardware and prove the feasibility of ASIC logic. And the modified design uses software to realize slower timer negotiation mechanism but uses hardware to realize fast bidirectional detection. All de- signs are proved reliable by FPGA simulation. The design can take advantage of hardware to realize fast failure detection with software aids and reduce hardware cost which can be used commercially.