为了给控制平面决策提供更多依据,SDN(Software Defined Networking)交换芯片不但需要对每个接口的报文收发数目进行计数,还要对动态配置的流表项的匹配次数等进行细粒度的统计。因此,与传统交换芯片相比,SDN交换芯片在计数器实现上面临更大挑战。本文首先分析了Open Flow交换对计数器实现的要求,然后提出一种集中式计数器实现模型CCM(Centralized Countin
Objective: To demonstrate the flow patterns and factors associated with adverse foetal outcome in high-risk pregnancy at Mulago Hospital using Doppler ultrasoun