Cisco IOS-XE 3.x
1. 下载 IOS-XE .bin 文件，链接https://software.cisco.com/download/home/284455380/type/282046477/release/3.6.9E（须先登录 Cisco 账户）
2. 通过 TFTP 传输 .bin 文件到交换机 flash
copy tftp://192.168.1.10/cat3k_caa-universalk9.SPA.03.06.09.E.152-2.E9.bin cat3k_caa-universalk9.SPA.03.06.09.E.152-2.E9.bin3. Install 模式升级
software install file flash:cat3k_caa-universalk9.SPA.03.06.09.E.152-2.E9.bin4. 清理
software clean
若要升级到 Cisco IOS-XE 16.x 版本，遇到兼容性检测提示未满足包依赖
Candidate package compatibility checks failed because the following则可尝试在安装命令后添加 new force
package dependencies were not satisfied. Operation aborted.
software install file flash:cat3k_caa-universalk9.16.06.04a.SPA.bin new force
Cisco IOS-XE 16.x
1. Install 模式升级
request platform software package install switch all file flash:cat3k_caa-universalk9.16.06.04a.SPA.bin2. 清理
request platform software package clean switch all file flash:或者
request platform software package clean注: 16.x 版本无 software install / software clean 命令，这里 switch all 指的是所有 switch
参考：
https://www.cisco.com/c/en/us/support/docs/switches/catalyst-3850-series-switches/117552-technote-cat3850-00.html
https://www.booches.nl/2016/03/cisco-ios-xe-16-x/
https://community.cisco.com/t5/switching/unable-to-use-quot-software-quot-command-on-cisco-catalyst-3850/td-p/2978615
https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst3850/software/release/16-3/release_notes/ol-16-3-3850.html
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