This chapter shows how to configure seamless bfd and how to use isis to advertise local-discriminators. 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.

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 does not bring down the SR-TE session. SBFD also provides faster session bring up due to less control packets exchange. S-BFD does not help in bringing up SR-TE session quickly. The BFD state is only maintained at head end thereby reducing overhead.