P4-PSFP:基于 P4 的时间敏感型网络每流过滤和 Policing

IF 4.7 2区 计算机科学 Q1 COMPUTER SCIENCE, INFORMATION SYSTEMS
Fabian Ihle;Steffen Lindner;Michael Menth
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引用次数: 0

摘要

时敏网络(TSN)扩展了以太网,实现了实时通信。在 TSN 中,通过用于带宽整形的 "基于信用的整形器"(CBS)和用于流量调度的 "时间感知整形器"(TAS)等机制,可实现有界延迟和基于拥塞的零数据包丢失。一般来说,TSN 要求数据流在传输前必须明确接入。为确保接纳的流量符合为接纳控制而指定的流量描述符,定义了每流过滤和极化(PSFP)。对于基于信用的计量,采用了众所周知的令牌桶策略。但是,基于时间的计量需要与时间相关的交换机行为和亚微秒精度的时间同步。虽然支持 TSN 的交换机支持各种 TSN 流量整形机制,但 PSFP 的全面实施仍然不可用。为了弥补这一差距,我们在每端口 100 Gb/s 的硬件交换机上介绍了基于 P4 的 PSFP 实现。我们解释了 PSFP 实现中最有趣的方面,其代码可在 GitHub 上获取。我们演示了基于信用和基于时间的警戒和同步功能,以验证 P4-PSFP 的功能和有效性。根据流识别方法的不同,该实现可扩展至 35840 个流。只要适当的 TSN 交换机缺乏这一功能,P4-PSFP 就能在实践中使用。此外,它的实现可能有助于其他需要时间同步的基于 P4 的硬件实现。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
P4-PSFP: P4-Based Per-Stream Filtering and Policing for Time-Sensitive Networking
Time-Sensitive Networking (TSN) extends Ethernet to enable real-time communication. In TSN, bounded latency and zero congestion-based packet loss are achieved through mechanisms such as the Credit-Based Shaper (CBS) for bandwidth shaping and the Time-Aware Shaper (TAS) for traffic scheduling. Generally, TSN requires streams to be explicitly admitted before being transmitted. To ensure that admitted traffic conforms with the traffic descriptors indicated for admission control, Per-Stream Filtering and Policing (PSFP) has been defined. For credit-based metering, well-known token bucket policers are applied. However, time-based metering requires time-dependent switch behavior and time synchronization with sub-microsecond precision. While TSN-capable switches support various TSN traffic shaping mechanisms, a full implementation of PSFP is still not available. To bridge this gap, we present a P4-based implementation of PSFP on a 100 Gb/s per port hardware switch. We explain the most interesting aspects of the PSFP implementation whose code is available on GitHub. We demonstrate credit-based and time-based policing and synchronization capabilities to validate the functionality and effectiveness of P4-PSFP. The implementation scales up to 35840 streams depending on the stream identification method. P4-PSFP can be used in practice as long as appropriate TSN switches lack this function. Moreover, its implementation may be helpful for other P4-based hardware implementations that require time synchronization.
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来源期刊
IEEE Transactions on Network and Service Management
IEEE Transactions on Network and Service Management Computer Science-Computer Networks and Communications
CiteScore
9.30
自引率
15.10%
发文量
325
期刊介绍: IEEE Transactions on Network and Service Management will publish (online only) peerreviewed archival quality papers that advance the state-of-the-art and practical applications of network and service management. Theoretical research contributions (presenting new concepts and techniques) and applied contributions (reporting on experiences and experiments with actual systems) will be encouraged. These transactions will focus on the key technical issues related to: Management Models, Architectures and Frameworks; Service Provisioning, Reliability and Quality Assurance; Management Functions; Enabling Technologies; Information and Communication Models; Policies; Applications and Case Studies; Emerging Technologies and Standards.
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