Department of Computer Science and Engineering Department of Computer Science and Engineering Department of Electrical and Computer Engineering Huawei University of Murcia This document defines an information model and a YANG data model for the Security Controller-Facing Interface between two security controllers in an Interface to Network Security Functions (I2NSF) framework located in different Domains. This interface is used for the exchange of IPsec flow protection to protect the IP Communication between two Network Security Functions (NSFs) in cross-domain environments. The YANG data model in this document is built on the basis of the YANG data model for IPsec flow protection based on Software-Defined Networking (SDN).