网络虚拟化及网络功能虚拟化技术探讨

[摘要] 对网络虚拟化及网络功能虚拟化的需求及热点技术进行分析，并提出在运营商网络中的典型应用场景：数据中心网络、移动核心网络、家庭网络。数据中心网络虚拟化可灵活实现不同租户的安全、流量、性能策略，实现网络自动配置；演进分组核心网网元虚拟化通过网络功能虚拟化实现不同种类网络硬件架构的统一，解决容量增加带来的成本问题，解决业务灵活部署和增强的问题；家庭网络虚拟化可简化用户侧设备，通过减少用户终端设备的维护和升级进而降低运营成本，并提高业务部署的灵活性。

[关键词] 网络虚拟化；网络功能虚拟化；叠加网络；虚拟可扩展局域网；业务链

[Abstract] This article provides some ideas for network virtualization and network function virtualization. It describes three typical scenarios of these topics in a carrier’s network, including data center network(DCN), evolved packet core network (EPC), and home network (HN). DCN virtualization provides better security, throughput, and performance for multiple tenants, and the network can be configured automatically. EPC virtualization enables different types of network equipment be consolidated in order to reduce TCO. Through dynamic network reconfiguration, it also enables higher service availability and resiliency for end users. HN virtualization can simplify user equipment and reduce OPEX by eliminating the need to constantly maintain and upgrade the CPEs. HN virtualization also makes service deployment more flexible.

[Keywords] network virtualization; network functions virtualization; overlay network; VXLAN; service chaining