China Mobile Huawei Technologies China Mobile ZTE Corporation China Mobile The Segment Routing over IPv6 (SRv6) Network Programming framework enables a network operator or an application to specify a packet processing program by encoding a sequence of instructions in the IPv6 packet header. Following the SRv6 Network Programming concept, this document defines SRv6 based mechanisms for inter-layer network programming, which can help to integrate the packet network layer with its underlying layers efficiently. New SRv6 behaviors used for steering packets to underlay links or connections are defined, and the applicability of these SRv6 behaviors in typical inter-layer network programming scenarios is illustrated.