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Consistent Network Update without tagging

机译:一致的网络更新无需标记

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摘要

Designing of network update algorithms is urgent for development of SDN control software. A particular case of Network Update Problem is that of adding a set of forwarding rules into flow-tables of SDN switches (say, to install new paths in the network) or restoring seamlessly a given network configuration after some packet forwarding rules have been disabled (say, at the expiry of their time-outs). Some algorithms provide solutions to these problems but only with the help of tagging techniques. But is it possible to perform a consistent network update without tagging? We study this problem in the framework of a formal model of SDN, develop correct and safe network updating algorithms, and show that in some cases it is impossible to update consistently network configurations without resorting either to tagging or to priorities of packet forwarding rules.
机译:网络更新算法的设计迫切需要开发SDN控制软件。 一个特定的网络更新问题的情况是将一组转发规则添加到SDN交换机的流动表中(例如,在网络中安装新路径)或在已禁用某些数据包转发规则后无缝恢复给定的网络配置( 说,在他们的超时到期时)。 一些算法为这些问题提供了解决方案,但仅借助标记技术。 但是是否有可能在不标记的情况下执行一致的网络更新? 我们在SDN的正式模型的框架内研究了这个问题,开发了正确和安全的网络更新算法,并在某些情况下显示不可能更新一致的网络配置,而无需借鉴标记或数据包转发规则的优先级。

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