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Network Function Virtualization (NFV) is a critical part of a new defense paradigm providing high flexibility at a lower cost through software-based virtual instances. Despite the promise of the NFV, the original Intrusion Detection System (IDS) designed for NFV still draws heavily on processing power and requires significant CPU resources. In this paper, we provide a framework for dynamic defense provision by building in light intrusion detection network functions (NFs) over NFV. Without using the existing IDSes, our system constructs a light intrusion detection system by using a chain of network functions in NFV. The entire IDS is broken down into separate light network functions according to different protocols. The intrusion detection NFs cover various protocol stacks from the link layer to the application layer protocols. They also include different deep packet inspection NFs for different application layer protocols. The experimental results show the proposed system reduces resource consumption while performing valid intrusion detection functions.