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A logical chaining of Virtual Network Functions (VNFs) enables toy-blocking style composition of various network services. VNFs are generally based on Virtual Machines (VMs) running on commodity servers. However, such VM-based VNFs have poor packet forwarding performance because of the virtual network I/O overhead, and therefore virtualization of the core network functions can degrade overall network...
Network Functions Virtualization (NFV) is now accepted in large production networks for agile introduction of various Network Functions (NFs). A service chaining technology that dynamically links multiple NFs over the entire network is a heart of the NFV concept. However, virtualizing NF-dedicated hardwares as virtual machines on IA servers brings performance problems, such as lower throughput, longer...
Network Functions Virtualization (NFV) has been expected to flexibly compose Virtual Network Functions (VNFs) by virtualizing existing network appliances and logically chaining them. Currently used VNFs are realized as VM-based appliances and shared by multiple users (VMs). However, the notion of NFV can be extended to reinforce network functionality of user VMs by introducing VM-dedicated VNFs. In...
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