In addition, it introduces the Bidirectional Forwarding Detection (BFD) protocol in the link protection and its application in the error detection in Ethernet linear and ring protections.

• 此外，文章还介绍了链路保护中的双向转发检测(BFD)协议，以及BFD协议在以太网线性/环网保护中如何进行故障检测。