配置已经生效了
Switch#show interfaces fastEthernet 0/1
FastEthernet0/1 is down, line protocol is down (disabled)
Hardware is Lance, address is 0060.7093.3201 (bia 0060.7093.3201)
MTU 1500 bytes, BW 10000 Kbit, DLY 1000 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation ARPA, loopback not set
Keepalive set (10 sec)
Half-duplex, 10Mb/s ---------半双工，10M速率
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