第二章广域网协议设置教材.doc

一、HDLC 　 HDLCCISCO路由器使用的缺省协议，一台新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 注:1.以下给出一个显示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 2. ?????? 举例 ? 　 　 Router1: interface Serial0 ip address 192.200.10.1 255.255.255.0 clockrate 1000000 ? Router2: interface Serial0 ip address 192.200.10.2 255.255.255.0 ! 3. ???? 举例使用E1线路实现多个64K专线连接. 相关命令: 命令 进入controller配置模式 controller {t1 | e1} number 选择帧类型 framing {crc4 | no-crc4} 选择line-code类型 linecode {ami | b8zs | hdb3} 建立逻辑通道组与时隙的映射 channel-group number timeslots range1 显示controllers接口状态 show controllers e1 [slot/port]2 ? 注: 1. 当链路为T1时,channel-group编号为0-23, Timeslot范围1-24; 当链路为E1时, channel-group编号为0-30, Timeslot范围1-31. 2.使用show controllers e1观察controller状态,以下为帧类型为crc4时controllers正常的状态. ? Router# show controllers e1 e1 0/0 is up. Applique type is Channelized E1 - unbalanced Framing is CRC4, Line Code is HDB3 No alarms detected. Data in current interval (725 seconds elapsed): 0 Line Code Violations, 0 Path Code Violations 0 Slip Secs, 0 Fr Loss Secs, 0 Line Err Se