某局点AP 频繁批量上下线

局点使用     WX5560H, 二层注册2177个AP，

发生AP大批量的上下线。

 ===============display wlan ap statistics online-record=============== 

 Time Manual AP Auto AP Total Total delta 

     2022-04-22/16:37:55 2177 0 2177 2 

     2022-04-22/16:36:55 2175 0 2175 134 

     2022-04-22/16:35:55 2041 0 2041 -133 

     2022-04-22/16:34:55 2174 0 2174 -2   

从AP的掉线原因看，主要故障是链路不稳，但是ping包又不存在丢包

 ===============display wlan ap statistics tunnel-down-record=============== 

 AP name AP ID Tunnel down at Tunnel Down Reason

 LX-LiuXueSheng-829 1687 04-22/16:36:33 Failed to retransmit messa ge 

 LX-LiuXueSheng-1116 1770 04-22/16:36:14 Processed join request in Run state 

 LX-2-808 1273 04-22/16:36:06 Processed join request in Run state 

 LX-LiuXueSheng-1102 1756 04-22/16:36:01 Processed join request in Run state

 LX-2-104 986 04-22/16:36:00 Processed join request in Run state       

查看Ap上行口，发现入方向存在大量报文

Last 300 second input: 8400 packets/sec 6604414 bytes/sec 5% 

 Last 300 second output: 410 packets/sec 70760 bytes/sec 0%

疑似报文冲击，通过抓包发现，存在单播大流量冲击，

往交换机侧排查，发现存在TC报文泛洪。

在核心交换机侧禁止TC报文泛洪