摘要： defer模块的进程模型是eth_defer_v2，功能是"Deference：For CSMA/CD Ethernet, the process by which a station delays its transmission when the channel is busy to avoid contention with ongoing transmission"，就是检测链路的情况，并保持一个延迟标志(deference flag)，使mac模块能通过统计线读取来确定传输是否被允许，以避免冲突。该模块没有model attribute、global statis 阅读全文