HDLC是CISCO路由器使用的缺省协议，ngkelfngle一台新工业级3g路由器 在未指定封装协议时默认使用HDLC封装。
1. 有关命令
端口设置
任务
命令
设置HDLC封装
encapsulation hdlc
设置DCE端线路速度
clockrate speed
复位一个硬件接口
clear interface serial unit
显示接口状态
show interfaces serial [unit] 1
命令
设置HDLC封装
encapsulation hdlc
设置DCE端线路速度
clockrate speed
复位一个硬件接口
clear interface serial unit
显示接口状态
show interfaces serial [unit] 1
注:1.以下给出一个中小企业路由器 显示Cisco同步串口状态的例子.
Router#show interface serial 0
Serial 0 is up, line protocol is up
Hardware is MCI Serial
Internet address is 150.136.190.203, subnet mask is 255.255.255.0
MTU 1500 bytes, BW 1544 Kbit, DLY 20000 usec, rely 255/255, load 1/255
Encapsulation HDLC, loopback not set, keepalive set (10 sec)
Last input 0:00:07, output 0:00:00, output hang never
Output queue 0/40, 0 drops; input queue 0/75, 0 drops
Five minute input rate 0 bits/sec, 0 packets/sec
Five minute output rate 0 bits/sec, 0 packets/sec
16263 packets input, 1347238 bytes, 0 no buffer
Received 13983 broadcasts, 0 runts, 0 giants
2 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 2 abort
22146 packets output, 2383680 bytes, 0 underruns
0 output errors, 0 collisions, 2 interface resets, 0 restarts
1 carrier transitions
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