IOU 模拟serial（串口）不能通

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大家有没有遇到过serial口不能使用的情况？
我配置了ip 直连ping都不通，什么原因？

Router(config)#int s2/1
Router(config-if)#ip add 192.168.1.2 255.255.255.0
Router(config-if)#clo
Router(config-if)#clock ra 64000
Router(config-if)#no sh
*Dec 12 00:59:48.706: %LINK-3-UPDOWN: Interface Serial2/1, changed state to up
*Dec 12 00:59:49.716: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial2/1, changed state to up

Router(config-if)#do ping 192.168.1.2
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 192.168.1.2, timeout is 2 seconds:
.....
Success rate is 0 percent (0/5)

Router(config-if)#
*Dec 12 01:00:16.132: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial2/1, changed state to down

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