Bidirectional Forwarding Detection (BFD) is a detection protocol designed to provide fast forwarding path failure detection
times for all media types, encapsulations, topologies, and routing protocols.
BFD provides a consistent failure detection method for network administrators, in addition to fast forwarding path failure
detection. 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.
Seamless Bidirectional Forwarding Detection (S-BFD), is a simplified mechanism for using BFD with a large proportion of negotiation
aspects eliminated, thus providing benefits such as quick provisioning, as well as improved control and flexibility for network
nodes initiating path monitoring.
If SBFD session fails, S-BFD brings down the SR-TE session. S-BFD also provides faster session bring up due to less control
packets exchange. S-BFD is associated with SR-TE to bring a session up quickly. The BFD state is only maintained at head end
thereby reducing overhead.
S-BFD implements support for RFC 7880, RFC 7881 on segment routing.