实验环境，在虚机中安装了C9800-CL无线控制器，一个AP1815i做测试注册到控制器失败（此AP之前实验进刷过ME后切换回capwap AP），报错如下：
[*03/14/2021 18:07:00.4663] do ABORT, part2 is active part
[*03/14/2021 18:07:00.5308] upgrade.sh: Cleanup tmp files ...
[*03/14/2021 18:07:00.6137] Discarding msg CAPWAP_WTP_EVENT_REQUEST(type 9) in CAPWAP state: DTLS Teardown(4).
[*03/14/2021 18:07:00.6139] Discarding msg CAPWAP_WTP_EVENT_REQUEST(type 9) in CAPWAP state: DTLS Teardown(4).
[*03/14/2021 18:07:14.8560]
[*03/14/2021 18:07:14.8560] CAPWAP State: Discovery
[*03/14/2021 18:07:14.8578] Got WLC address 34.1.1.253 from DHCP.
[*03/14/2021 18:07:14.8579] IP DNS query for CISCO-CAPWAP-CONTROLLER.baomi.com
[*03/14/2021 18:07:14.9346] Discovery Request sent to 34.1.1.253, discovery type DHCP(2)
[*03/14/2021 18:07:15.0007] Discovery Request sent to 255.255.255.255, discovery type UNKNOWN(0)
没有尝试过其它AP，请大家给分析一下如何解决？感谢！
