Before an application can request the establishment of an S-BFD session, a mapping table of remote discriminators to peer far-end IP addresses must exist. The mapping can be accomplished in two ways:
statically configured
automatically learned using opaque OSPF/IS-IS routing extensions
See Static S-BFD discriminator configuration and Automated S-BFD discriminator distribution for more information about mapping remote discriminators to IP-addresses and to originated router-id.