無線丟包原因有很多，主要排查思路就兩個，一觀察丟包時，AP的空口是否異常增高；二觀察丟包時，AP的CPU利用率及內存情況。
通過對AP的觀察，發現了丟包時AP的cpu會異常升高到90%多，而且轉發進程被占滿。
[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
通過觀察能初步判斷，CPU異常升高的時間有着大量廣播報文發送到AP，在AP上聯口鏡像抓包后，也表明確實存在突發大量異常廣播報文。
進行分析后發現異常廣播報文均為網關設備發送的ARP報文，通過檢查網關設備，發現網關設備上有大量TC報文，導致網關設備不停刷新ARP報文，從而導致無線體驗不好。