HDLC是CISCO路由器使用的缺省協議，一臺新路由器在未指定封裝協議時默認使用HDLC封裝。

1. 有關命令

端口設置

任務
?命令
?
設置HDLC封裝
?encapsulation hdlc
?
設置DCE端線路速度
?clockrate speed
?
復位一個硬件接口
?clear interface serial unit
?
顯示接口狀態
?show interfaces serial [unit] 1?
?

注:1.以下給出一個顯示Cisco同步串口狀態的例子.

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???????

總結

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