HDLC背对背连接

剑心通明

前言
本文为高级数据链路控制（HDLC）背对背连接提供示 例配置。您能使用它验证您的连接和硬件适当地运作。
硬件和软件版本

• 此配置是可适用的对所有Cisco IOS软 件版本。
  
• DCE边用广域网DCE电缆连接 。
  
• DTE边用广域网DTE电缆连接。

欲知关于广域
网DCE/DTE电缆的更多信息请点击此处
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。
网络图
本文根据以下配置：


在此配置， Prasit作为DCE和Spicey是DTE。
配置
Prasit
interface Serial0
   ip address 5.0.2.1 255.255.255.0
   clockrate 64000
   no cdp enable

Spicey
interface Serial1
   ip address 5.0.2.2 255.255.255.0
   no cdp enable

show命令
使用以下show命令测试您的网络适当地运行：

• show controllers
  
• ping
  
• show interfaces

如下 所示的输出是输入这些命令的结果在我们在此示例配置使用的设备 。
我们能使用 show controllers命令表示， 物理层工作和确定什么类型的电缆连接。我们能从输出发现 在该Prasit之下是DCE和Spicey是DTE：
    prasit#show controllers serial 0
    HD unit 0, idb = 0x1D3A2C, driver structure at 0x1DAFE8
    buffer size 1524 HD unit 0, V.35 DCE cable, clockrate 64000     spicey#show controllers serial 1
    HD unit 1, idb = 0x153E94, driver structure at 0x15A1F8
    buffer size 1524 HD unit 1, V.35 DTE cable
Prasit
在Prasit，输入以下命令：
prasit#ping 5.0.2.2
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 5.0.2.2, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 28/31/32 ms
prasit#show interfaces serial 0
Serial0 is up, line protocol is up
  Hardware is HD64570
  Internet address is 5.0.2.1/24
  MTU 1500 bytes, BW 1544 Kbit, DLY 20000 usec,
     reliability 255/255, txload 1/255, rxload 1/255
  Encapsulation HDLC, loopback not set
  Keepalive set (10 sec)
  Last input 00:00:04, output 00:00:00, output hang never
  Last clearing of "show interface" counters 00:02:23
  Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
  Queueing strategy: weighted fair
  Output queue: 0/1000/64/0 (size/max total/threshold/drops)
     Conversations  0/1/256 (active/max active/max total)
     Reserved Conversations 0/0 (allocated/max allocated)
     Available Bandwidth 1158 kilobits/sec
  5 minute input rate 0 bits/sec, 1 packets/sec
  5 minute output rate 0 bits/sec, 0 packets/sec
     29 packets input, 1868 bytes, 0 no buffer
     Received 14 broadcasts, 0 runts, 0 giants, 0 throttles
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
     30 packets output, 1890 bytes, 0 underruns
     0 output errors, 0 collisions, 0 interface resets
     0 output buffer failures, 0 output buffers swapped out
     0 carrier transitions
     DCD=up  DSR=up  DTR=up  RTS=up  CTS=up
prasit#
Spicey
输入以下命令在Spicey：
spicey#ping 5.0.2.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 5.0.2.1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 32/32/32 ms
spicey#show interfaces serial 1
Serial1 is up, line protocol is up
   Hardware is HD64570
  Internet address is 5.0.2.2/24
  MTU 1500 bytes, BW 1544 Kbit, DLY 20000 usec,
     reliability 255/255, txload 1/255, rxload 1/255
  Encapsulation HDLC, loopback not set
  Keepalive set (10 sec)
  Last input 00:00:07, output 00:00:03, output hang never
  Last clearing of "show interface" counters 00:03:35
  Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
  Queueing strategy: weighted fair
  Output queue: 0/1000/64/0 (size/max total/threshold/drops)
     Conversations  0/1/256 (active/max active/max total)
     Reserved Conversations 0/0 (allocated/max allocated)
  5 minute input rate 0 bits/sec, 1 packets/sec
  5 minute output rate 0 bits/sec, 0 packets/sec
     41 packets input, 2524 bytes, 0 no buffer
     Received 21 broadcasts, 0 runts, 0 giants, 0 throttles
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
     46 packets output, 2980 bytes, 0 underruns
     0 output errors, 0 collisions, 2 interface resets
     0 output buffer failures, 0 output buffers swapped out
     6 carrier transitions
     DCD=up  DSR=up  DTR=up  RTS=up  CTS=up
spicey#


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