无线丢包原因有很多，主要排查思路就两个，一观察丢包时，AP的空口是否异常增高；二观察丢包时，AP的CPU利用率及内存情况。
通过对AP的观察，发现了丢包时AP的cpu会异常升高到90%多，而且转发进程被占满。
[a2-406-3-probe]dis interface GigabitEthernet 1/0/1 | include Input
Input (total): 19745904 packets, 5893958159 bytes
Input (normal): 19745904 packets, 5893958159 bytes
Input: 0 input errors, 0 runts, 0 giants, - throttles
[a2-406-3-probe]dis cpu
Unit CPU usage:
34% in last 5 seconds
33% in last 1 minute
31% in last 5 minutes
[a2-406-3-probe]dis interface GigabitEthernet 1/0/1 | include Input
Input (total): 19760223 packets, 5895411001 bytes
Input (normal): 19760223 packets, 5895411001 bytes
Input: 0 input errors, 0 runts, 0 giants, - throttles
[a2-406-3-probe]dis cpu
Unit CPU usage:
93% in last 5 seconds
33% in last 1 minute
31% in last 5 minutes
[a2-406-3-probe]dis interface GigabitEthernet 1/0/1 | include Input
Input (total): 19768447 packets, 5897240124 bytes
Input (normal): 19768447 packets, 5897240124 bytes
Input: 0 input errors, 0 runts, 0 giants, - throttles
[a2-406-3-probe]dis cpu
Unit CPU usage:
93% in last 5 seconds
33% in last 1 minute
通过观察能初步判断，CPU异常升高的时间有着大量广播报文发送到AP，在AP上联口镜像抓包后，也表明确实存在突发大量异常广播报文。
进行分析后发现异常广播报文均为网关设备发送的ARP报文，通过检查网关设备，发现网关设备上有大量TC报文，导致网关设备不停刷新ARP报文，从而导致无线体验不好。