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图中是网络中抓到dhcp offer的包,看到dhcp服务器给网络中cisco交换机的mac地址分配IP地址,offer包之前能够看到交换机 mac 00:14:1c:bb:0b:00 发送discovery包,确认了一下应该是交换机的mac地址,交换机为什么会向DHCP服务请求mac呢,这种现象正常吗,怎么去防止?