Enhanced SRv6 EVPN System

SRv6 (Segment routing IPv6) provides powerful programmability and is expected to become an important protocol foundation for ICT. In order to meet new requirements of ubiquitous access with floating IP and cloud-network convergence etc., this paper proposes a new functional extension of SRv6 EVPN, and puts forward an enhanced SRv6 EVPN+ model, including: 1) A loose EVPN mode is constructed to enhance the floating access and dynamic networking capabilities;2) A method of path selection with lightweight constraints by protocol extension is proposed;3) A SRv6 Hierarchical EVPN (H-EVPN) model is constructed to improve the scalability and security. Finally, this paper gives an innovative implementation scheme of 5G dedicated line based on SRv6 EVPN+ model.