Which mechanism can you use to achieve sub-second failover for link failure detection when a switched Ethernet media is used and loss of signal is not supported by the link provider?
A.
OSPF standard hellos
B.
Cisco Discovery Protocol link detection
C.
Bidirectional Forwarding Detection
D.
Fast Link Pulse
E.
autonegotiation
Explanation:
BFD is a detection protocol designed to provide fast forwarding path failure detection times for all media types, encapsulations, topologies, and routing protocols. In addition to fast forwarding path failure detection, BFD provides a consistent failure detection method for network administrators. Because the network administrator can use BFD to detect forwarding path failures at a uniform rate, rather than the variable rates for different routing protocol hello mechanisms, network profiling and planning will be easier, and reconvergence time will be consistent and predictable.Cisco Express Forwarding (CEF) and IP routing must be enabled on all participating routers.
You must enable Cisco Parallel eXpress Forwarding (PXF) on the Cisco 10720 Internet router in order for BFD to operate properly. PXF is enabled by default and is generally not turned off.
One of the IP routing protocols supported by BFD must be configured on the routers before BFD is deployed.