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SliM: Enabling efficient, seamless NFV state migration

机译：SLIM：启用高效，无缝NFV状态迁移

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Instance migration and scale-in/out operations in network functions virtualization (NFV) require state transfer mechanisms, which are known to cause service degradation through increased jitter and packet loss. Techniques such as packet duplication for state synchronization mitigate this problem, however, they incur significant additional costs. In this paper, we provide a novel interface to the VNF to announce “statelets” for incoming packets, which comprise only the information in the packet which is required for a VNF's internal state change. Based on this interface, we design and implement SliM, a statelet-based framework for seamless VNF migration. First evaluation results show that SliM operates seamlessly at very high dataplane utilization of physical links, up to 3 times the utilization level at which existing approaches are failing due to insufficient bandwidth for state synchronization.
机译：网络功能中的实例迁移和缩放/输出操作虚拟化（NFV）需要状态传输机制，该机制通过增加的抖动和数据包丢失来引起服务劣化。但是，诸如状态同步的数据包复制的技术减轻了这个问题，但是它们会产生大量额外的成本。在本文中，我们为VNF提供了一个新颖的接口，以宣传传入数据包的“satelets”，其仅包括VNF内部状态改变所需的数据包中的信息。基于此界面，我们设计和实施SLIM，基于Statelet的无缝VNF迁移框架。第一个评估结果表明，SLIM在非常高的数据平面利用物理链路下无缝运行，最多3倍的利用水平由于用于状态同步的带宽不足而导致的现有方法失败。

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