单项选择题
A.减少核心层隧道数量,降低核心层设备负担B.实现核心层和接入层异侧断纤的隧道保护C.使得在核心层和接入层可以部署不同的协议的隧道,组网更加灵活D.降低接入层设备的负担
A.show bfd neighbor briefB.debug bfd packetC.debug bfd eventsD.show bfd neighbors detail
A.show ip backup routeB.show ip routeC.show ip interface briefD.show ip fast-reroute