AI 中文总结
针对L4S难以在非接入链路部署的问题，提出利用BGP团体等现有机制的部署策略，经FABRIC测试平台验证，可扩展互联网低延迟服务。
AI 中文摘要
L4S这类用于低延迟网络服务的协议已吸引了康卡斯特、苹果、T-Mobile、英伟达等主要行业利益相关者的日益关注。不过，L4S需要在L4S流与经典流之间进行隔离，以维持其低延迟优势并实现安全共存。L4S架构采用DualPI2 AQM机制，在瓶颈出现在家庭接入链路时提供这种隔离。但在实际应用中，瓶颈也可能出现在网络的其他位置，比如对等互联点、广域网入口，或是核心网中偶尔出现的拥塞链路，而在这些位置部署DualPI2 AQM并不可行。若不解决这一问题，L4S可能难以推广，因为若缺乏端到端支持，其优势仍会受限。为应对这一挑战，我们提出一种部署策略，通过利用BGP团体、SRv6、带速率上限的优先级队列等现有网络机制，减少对昂贵核心路由器升级的需求。我们在FABRIC测试平台上开展大规模实验，验证了该方法的可行性。结果表明，该部署策略可在互联网上，甚至在独立管理的网络之间扩展低延迟服务。
英文摘要
Protocols such as L4S for low latency network services have attracted growing interest from major industry stakeholders such as Comcast, Apple, T-Mobile, and NVIDIA. However, L4S requires isolation between L4S flows and classic flows in order to maintain its low latency benefits and safe coexistence. The L4S architecture uses a DualPI2 AQM mechanism to provide this isolation when the bottleneck occurs at the home access link. In practice, however, bottlenecks may also occur at other locations in the network, such as peering points, ingress to wide area networks, or occasionally congested links in the core, where deploying DualPI2 AQM is not feasible. Without a solution to this problem, L4S may struggle to gain deployment, since its benefits may remain limited without end-to-end support. To address this challenge, we propose a deployment strategy that reduces the need to upgrade expensive core routers by using existing networking mechanisms such as BGP communities, SRv6, and priority queues with rate caps. We demonstrate the feasibility of this approach through large scale experiments on the FABRIC testbed. Our results demonstrate a practical deployment strategy for extending low latency service across the Internet, even across independently administered networks.
CommentsAccepted to the IEEE International Conference on Network Protocols (ICNP), 2026
