HDLC协议

1/23/2008来源:网络协议人气:8017


  一、HDLC
  有关命令
  举例
  举例使用E1线路实现多个64K专线连接
  HDLC是CISCO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
  设置如下:
  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: 任务 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 Secs, 0 Degraded Mins
  0 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 0 Unavail Secs
  Total Data (last 24 hours) 0 Line Code Violations, 0 Path Code Violations,
  0 Slip Secs, 0 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins,
  0 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 0 Unavail Secs
  以下例子为E1连接3条64K专线, 帧类型为NO-CRC4,非平衡链路,路由器具体设置如下:
  shanxi#wri t
  Building configuration...
  Current configuration:
  !

  version 11.2
  no service udp-small-servers
  no service tcp-small-servers
  !
  hostname shanxi
  !
  enable secret 5 $1$XN08$Ttr8nfLoP9.2RgZhcBzkk/
  enable passWord shanxi
  !
  !
  ip subnet-zero
  !
  controller E1 0
  framing NO-CRC4
  channel-group 0 timeslots 1
  channel-group 1 timeslots 2
  channel-group 2 timeslots 3
  !
  interface Ethernet0
  ip address 133.118.40.1 255.255.0.0
  media-type 10BaseT
  !
  interface Ethernet1
  no ip address
  shutdown
  !
  interface Serial0:0
  ip address 202.119.96.1 255.255.255.252
  no ip mroute-cache
  !
  interface Serial0:1
  ip address 202.119.96.5 255.255.255.252
  no ip mroute-cache
  !
  interface Serial0:2
  ip address 202.119.96.9 255.255.255.252
  no ip mroute-cache
  !
  no ip classless
  ip route 133.210.40.0 255.255.255.0 Serial0:0
  ip route 133.210.41.0 255.255.255.0 Serial0:1
  ip route 133.210.42.0 255.255.255.0 Serial0:2
  !
  line con 0
  line aux 0
  line vty 0 4
  password shanxi
  login
  !
  end