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
Prasit
interface Serial0
ip address 5.0.2.1 255.255.255.0
encapsulation lapb dce
clockrate 64000
Spicey
interface Serial1
ip address 5.0.2.2 255.255.255.0
encapsulation lapb
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)
Conversations0/1/256 (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=upDSR=upDTR=upRTS=upCTS=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)
Conversations0/1/256 (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=upDSR=upDTR=upRTS=upCTS=up
spicey#
