Explanation
TLOC routes are the logical tunnel termination points on the vEdge routers that connect into a transport network. A TLOC route is uniquely identified and represented by a three-tuple, consisting of system IP address, link color, and encapsulation (Generic Routing Encapsulation [GRE] or IPSec). In addition to system IP address, color, and encapsulation, TLOC routes also carry attributes such as TLOC private and public IP addresses, carrier, preference, site ID, tag, and weight. For a TLOC to be considered in an active state on a particular vEdge, an active BFD session must be associated with that vEdge TLOC.
https://www.cisco.com/c/dam/en/us/td/docs/solutions/CVD/SDWAN/CVD-SD-WAN-Design-2018OCT.pdf