https://mp.weixin.qq.com/s/db_8ZX3UMmiUNC6S4nR0eA

简单介绍跨界干扰帧相关的问题。

本文目录：

1. 简介

2. 识图

3. 干扰帧

4. 帧抢占

5. 实际实现中的问题

6. 无处可配的Guard Band

7. 总结

1. 简介

An important requirement to achieve a low latency is to ensure that there are no interfering frames during the scheduled windows that are reserved for high priority traffic.

if an interfering frame begins transmission just before the reserved time period starts, it can extend transmission into the reserved window, and potentially interfere with higher priority traffic. Therefore, a guard band whose size is equal to the largest possible interfering frame is required before the window starts.

A larger guard band equates to a less efficient use of network bandwidth. However, this issue is addressed with the implementation of IEEE802.1Qbu (frame preemption).

Frame preemption breaks the interfering frame into smaller fragments. Therefore, the guard band must be as large as the largest possible interfering fragment instead of the largest possible interfering frame.

2. 识图

下图中的包含哪些要素？时间的流向如何？

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