LAPB背对背连接
2006-04-19   www.net130.com

前言

本文为提供示例配置链路接入过程, 平衡式(LAPB) 背对背连接。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和DTE电缆的更多信息请点击此处 。

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

interface Serial0
   ip address 5.0.2.1 255.255.255.0
   encapsulation lapb dce
   clockrate 64000
 

interface Serial1
   ip address 5.0.2.2 255.255.255.0
   encapsulation lapb
 

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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， Prasit是DCE和Spicey是DTE。 此命令提供您信息物理层是否 工作并且什么类型的电缆连接。

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
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 = 32/36/44 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 LAPB, loopback not set
LAPB DCE, state CONNECT, modulo 8, k 7, N1 12032, N2 20
T1 3000, T2 0, interface outage (partial T3) 0, T4 0, Protocol ip
VS 6, VR 6, tx NR 6, Remote VR 6, Retransmissions 0
Queues: U/S frames 0, I frames 0, unack. 0, reTx 0
IFRAMEs 30/31 RNRs 0/0 REJs 0/0 SABM/Es 1/1 FRMRs 0/0 DISCs 0/0
Last input 00:00:15, output 00:00:15, output hang never
Last clearing of "show interface" counters 00:09:37
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, 0 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
47 packets input, 3099 bytes, 0 no buffer
Received 0 broadcasts, 0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
40 packets output, 3080 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

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 LAPB, loopback not set
LAPB DTE, state CONNECT, modulo 8, k 7, N1 12032, N2 20
T1 3000, T2 0, interface outage (partial T3) 0, T4 0, Protocol ip
VS 3, VR 3, tx NR 3, Remote VR 3, Retransmissions 0
Queues: U/S frames 0, I frames 0, unack. 0, reTx 0
IFRAMEs 35/35 RNRs 0/0 REJs 0/0 SABM/Es 1/0 FRMRs 0/0 DISCs 0/0
Last input 00:00:07, output 00:00:07, output hang never
Last clearing of "show interface" counters 00:09:54
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, 0 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
43 packets input, 3586 bytes, 0 no buffer
Received 0 broadcasts, 0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
53 packets output, 3606 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
spicey#