您好，
您需要停止授权旧的DHCP服务器，之后使用netsh命令合并DHCP作用域。
如何使用 Netsh 实用程序可以导出和导入 DHCP 作用域
https://support.microsoft.com/zh-cn/help/281626/how-to-use-the-netsh-utility-to-export-and-import-dhcp-scopes
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