To reduce the end-to-end network delay caused by control logic update,we improved the waiting mechanism of label-based two-phase update policy.In the improved mechanism,the controller installs new control logic to all switches in new forwarding path in turn,the ingress switches on forwarding path label the data flow (setting VLAN id);the egress switches remove the label;and the middle switches, according to whether the labels are set on data flow,decide to send packet_in to controller or not.This scheme has been implemented in Open vSwitch,and has been verified through Mininet simulation experiment its feasibility and effectiveness.%为减少控制逻辑更新导致的网络时延，改进基于标签的两阶段更新策略中的等待机制。改进后的机制中，控制器依次向新转发路径上的所有交换机安装新的控制逻辑，转发路径上的入口交换机为数据流打上标签（设置 VLAN id），出口交换机去掉标签，中间交换机根据数据流是否设置了标签来决定是否发送 packet＿in。在 Open vSwitch 中实现了该机制，并通过 Mininet 仿真实验验证了该机制的可行性和有效性。
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