【菜鸟IT大讲堂】实验分享-HDLC和PPP配置合集（二）

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拓扑图

图6.1 HDLC和PPP配置实验拓扑图

回顾

上一集讲到实验环境准备、为R1、R2和R3的串行接口配置IP地址、在串行接口上启用HDLC协议。接下来我们将继续下一个步骤配置OSPF、管理串口连接、修改串行接口的封装类型为PPP等操作。

步骤四 配置OSPF

在三台路由器上都启用OSPF路由协议，并发布各自的直连路由。

[R1]ospf 1

[R1-ospf-1]area 0

[R1-ospf-1-area-0.0.0.0]network 10.0.12.0 0.0.0.255

[R2]ospf 1

[R2-ospf-1]area 0

[R2-ospf-1-area-0.0.0.0]network 10.0.12.0 0.0.0.255

[R2-ospf-1-area-0.0.0.0]network 10.0.23.0 0.0.0.255

[R3]ospf 1

[R3-ospf-1]area 0

[R3-ospf-1-area-0.0.0.0]network 10.0.23.0 0.0.0.255

配置完成后，检查设备是否通过OSPF协议学习到了相应的路由。

<R1>display ip routing-table

Route Flags: R - relay, D - download to fib

---

Routing Tables: Public

Destinations : 8 Routes : 8

Destination/Mask Proto Pre Cost Flags NextHop Interface

10.0.23.0/24 OSPF 10 3124 D 10.0.12.2 Serial1/0/0

……output omit……

确认相应的路由信息都已通过OSPF协议学习到。

在R1上，执行ping命令，检测R1和R3间的连通性。

<R1>ping 10.0.23.3

PING 10.0.23.3: 56 data bytes, press CTRL_C to break

Reply from 10.0.23.3: bytes=56 Sequence=1 ttl=254 time=44 ms

Reply from 10.0.23.3: bytes=56 Sequence=2 ttl=254 time=39 ms

Reply from 10.0.23.3: bytes=56 Sequence=3 ttl=254 time=39 ms

Reply from 10.0.23.3: bytes=56 Sequence=4 ttl=254 time=40 ms

Reply from 10.0.23.3: bytes=56 Sequence=5 ttl=254 time=39 ms

步骤五 管理串口连接

查看串行接口连接的线缆的类型、接口状态和时钟频率，并修改时钟频率。

<R1>display interface Serial1/0/0

Serial1/0/0 current state : UP

Line protocol current state : UP

Last line protocol up time : 2016-03-10 11:25:08

Description:HUAWEI, AR Series, Serial1/0/0 Interface

Route Port,The Maximum Transmit Unit is 1500, Hold timer is 10(sec)

Internet Address is 10.0.12.1/24

Link layer protocol is nonstandard HDLC

Last physical up time : 2016-03-10 11:23:55

Last physical down time : 2016-03-10 11:23:55

Current system time: 2016-03-10 11:51:12

Physical layer is synchronous, Baudrate is 64000 bps

Interface is DCE, Cable type is V35, Clock mode is DCECLK1

Last 300 seconds input rate 5 bytes/sec 40 bits/sec 0 packets/sec

Last 300 seconds output rate 2 bytes/sec 16 bits/sec 0 packets/sec

…output omit…

回显信息表明R1的S1/0/0接口连接的是DCE线缆，时钟频率是64000bit/s。DCE设备可以控制时钟频率和带宽。

将R1和R2间链路的时钟频率修改为128000bit/s。这一操作需在DCE设备R1上执行。

[R1]interface Serial 1/0/0

[R1-Serial1/0/0]baudrate 128000

配置完成后，查看串行接口的状态，确认时钟频率已修改。

<R1>display interface Serial1/0/0

Serial1/0/0 current state : UP

Line protocol current state : UP

Last line protocol up time : 2016-03-10 11:25:08

Description:HUAWEI, AR Series, Serial1/0/0 Interface

Route Port,The Maximum Transmit Unit is 1500, Hold timer is 10(sec)

Internet Address is 10.0.12.1/24

Link layer protocol is nonstandard HDLC

Last physical up time : 2016-03-10 11:23:55

Last physical down time : 2016-03-10 11:23:55

Current system time: 2016-03-10 11:54:19

Physical layer is synchronous, Baudrate is 128000 bps

Interface is DCE, Cable type is V35, Clock mode is DCECLK1

Last 300 seconds input rate 6 bytes/sec 48 bits/sec 0 packets/sec

Last 300 seconds output rate 4 bytes/sec 32 bits/sec 0 packets/sec

…output omit…

步骤六 修改串行接口的封装类型为PPP

在R1和R2以及R2和R3间修改串行接口使用PPP封装。链路两端必须配置相同的封装类型，否则接口状态会出现“Down”的情况。

[R1]interface Serial 1/0/0

[R1-Serial1/0/0]link-protocol ppp

Warning: The encapsulation protocol of the link will be changed. Continue? [Y/N]:y

[R2]interface Serial 1/0/0

[R2-Serial1/0/0]link-protocol ppp

Warning: The encapsulation protocol of the link will be changed. Continue? [Y/N]:y

[R2-Serial1/0/0]quit

[R2]interface Serial 2/0/0

[R2-Serial2/0/0]link-protocol ppp

Warning: The encapsulation protocol of the link will be changed. Continue? [Y/N]:y

[R3]interface Serial 2/0/0

[R3-Serial2/0/0]link-protocol ppp

Warning: The encapsulation protocol of the link will be changed. Continue? [Y/N]:y

配置完成后，检测链路连通性。

<R2>ping 10.0.12.1

PING 10.0.12.1: 56 data bytes, press CTRL_C to break

Reply from 10.0.12.1: bytes=56 Sequence=1 ttl=255 time=22 ms

Reply from 10.0.12.1: bytes=56 Sequence=2 ttl=255 time=27 ms

Reply from 10.0.12.1: bytes=56 Sequence=3 ttl=255 time=27 ms

Reply from 10.0.12.1: bytes=56 Sequence=4 ttl=255 time=27 ms

Reply from 10.0.12.1: bytes=56 Sequence=5 ttl=255 time=27 ms

<R2>ping 10.0.23.3

PING 10.0.23.3: 56 data bytes, press CTRL_C to break

Reply from 10.0.23.3: bytes=56 Sequence=1 ttl=255 time=35 ms

Reply from 10.0.23.3: bytes=56 Sequence=2 ttl=255 time=40 ms

Reply from 10.0.23.3: bytes=56 Sequence=3 ttl=255 time=40 ms

Reply from 10.0.23.3: bytes=56 Sequence=4 ttl=255 time=40 ms

Reply from 10.0.23.3: bytes=56 Sequence=5 ttl=255 time=40 ms

如果无法Ping通，请查看接口状态，观察协议状态是否正常。

<R1>display interface Serial1/0/0

Serial1/0/0 current state : UP

Line protocol current state : UP

Last line protocol up time : 2016-03-10 12:35:41

Description:HUAWEI, AR Series, Serial1/0/0 Interface

Route Port,The Maximum Transmit Unit is 1500, Hold timer is 10(sec)

Internet Address is 10.0.12.1/24

Link layer protocol is PPP

LCP opened, IPCP opened

Last physical up time : 2016-03-10 11:57:20

Last physical down time : 2016-03-10 11:57:19

Current system time: 2016-03-10 13:38:03

Physical layer is synchronous, Baudrate is 128000 bps

Interface is DCE, Cable type is V35, Clock mode is DCECLK1

Last 300 seconds input rate 7 bytes/sec 56 bits/sec 0 packets/sec

Last 300 seconds output rate 4 bytes/sec 32 bits/sec 0 packets/sec

…output omit…

下集预告：检查路由表项的变化、在R1和R2间的PPP链路启用PAP认证功能、在R2和R3间的PPP链路启用CHAP认证功能、使用debug命令查看R2和R3之间使用CHAP建立PPP连接的协商过程