网络功能虚拟化场景下的并行加速

doi:10.11959/j.issn.1000-0801.2018216

Abstract

Abstract:

Software-based sequential service chains in network function virtualization (NFV) could introduce significant performance overhead.Current acceleration efforts for NFV mainly target on optimizing each component of the sequential service chain.However,based on the statistics from real world enterprise networks,it was observed that 53.8% network function (NF) pairs could work in parallel.In particular,41.5% NF pairs could be parallelized without causing extra resource overhead.NFP was presented,a high performance framework,that innovatively enabled network function parallelism to improve NFV performance.NFP consisted of three logical components.Firstly,NFP provided a policy specification scheme for operators to intuitively describe sequential or parallel NF chaining intents.Secondly,NFP orchestrator intelligently identified NF dependency and automatically compiled the policies into high performance service graphs.Thirdly,NFP infrastructure performed light-weight packet copying,distributed parallel packet delivery,and load-balanced merging of packet copies to support NF parallelism.An NFP prototype based on DPDK in Linux containers was implemented.The evaluation results show that NFP achieves significant latency reduction for real world service chains.

Key words: NFV, network function parallelism, service chain

Jun BI,Chen SUN,Heng YU. NFP:enabling network function parallelism in NFV[J]. Telecommunications Science, 2018, 34(7): 41-48.

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References 25

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虚拟网络功能	产品	%	源IP地址	目的IP地址	源端口	目的端口	负载	增添/移除	丢弃
防火墙	iptables	26%	R	R	R	R			T
入侵检测系统	NIDS	20%	R	R	R	R	R
网关	Cisco MGX	19%	R	R
负载均衡器	F5,A10	10%	R/W	R/W	R	R
缓存器	Nginx	10%	R		R		R
虚拟专用网	OpenVPN	7%	R	R			R/W	T
地址转换器	iptables		R/W	R/W	R/W	R/W
流量代理	Squid		R/W	R/W
流量压缩器	Cisco IOS						R/W
流量整形器	Linux tc
监测器	NetFlow		R	R	R	R

描述方法	表达方式
图1 的传统串行服务组链描述方法	assign(VPN,1) assign(monitor,2) assign(FW,3) assign(LB,4)
图1 的策略语言服务组链描述方法	order(VPN,before,monitor) order(monitor,before,FW) order(FW,before,LB)
图2 的并行服务图组链描述方法	position(VPN,first) order(FW,before,LB) order(monitor,before,LB)

NFP:enabling network function parallelism in NFV

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