MAC地址与交换机端口绑定是交换机端口安全管理功能之一。
MAC Address binding with the switch port is one function of switch port security management.
这个算法能够快速收敛，缩小交换机端口的转发延迟，提高网络的实时特性。
It can decrease the transmitting delay at the port of switch and improve the real-time characteristic in the switched Ethernet.
如果Link state为down，那么就显示网线或网络交换机端口可能有问题。
A down state would indicate a possible bad cable or network switch port.
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