CISCO配置命令大全（3）
6、配置PPP: PPP(Point-to-Point Protocol)是SLIP(Serial Line IP protocol)的继承者，它提供了跨过同步和异步电路实现路由器到路由器(router-to-router)和主机到网络(host-to-network)的连接。CHAP(Challenge Handshake Authentication Protocol)和PAP(Password Authentication Protocol) (PAP)通常被用于在PPP封装的串行线路上提供安全性认证。使用CHAP和PAP认证,每个路由器通过名字来识别，可以防止未经授权的访问。
CHAP和PAP在RFC 1334上有详细的说明。
A. 有关命令
端口设置
任务 命令
设置PPP封装 encapsulation ppp1
设置认证方法 ppp authentication {chap | chap pap | pap chap | pap}
指定口令 username name password secret
设置DCE端线路速度 clockrate speed
注：1、要使用CHAP/PAP必须使用PPP封装。在与非Cisco路由器连接时，一般采用PPP封装，其它厂家路由器一般不支持Cisco的HDLC封装协议。
2. 举例
路由器Router1和Router2的S0口均封装PPP协议，采用CHAP做认证，在Router1中应建立一个用户，以对端路由器主机名作为用户名，即用户名应为router2。同时在Router2中应建立一个用户，以对端路由器主机名作为用户名，即用户名应为router1。所建的这两用户的password必须相同。
设置如下：
Router1:
hostname router1
username router2 password xxx
interface Serial0
ip address 192.200.10.1 255.255.255.0
clockrate 1000000
ppp authentication chap
!
Router2:
hostname router2
username router1 password xxx
interface Serial0
ip address 192.200.10.2 255.255.255.0
ppp authentication chap
7、广域网配置实例
DDR Example
Dial Backup Example
Configure subinterface Example
Frame> Channelized E1 Interface Example
X.25 Example
DDR Example
例：
Configuration for RouterA:
ip route 131.108.29.0 131.108.126.2
ip route 131.108.1.0 131.108.126.2
dialer-list 1 protocol ip permit
dialer-list 1 protocol ipx deny
!
interface serial 0
ip address 131.108.126.1 255.255.255.0
dialer in-band
dialer-group 1
!
dialer map ip 131.108.126.2 5551234
!
dialer> Dial Backup Example
A)同步V.25 bits方式
Configuration for RouterA:
interface Serial0:0
backup delay 0 10
backup interface Serial10
ip address 16.217.30.2 255.255.255.252
!
interface Serial10
ip address 16.30.16.81 255.255.255.0
encapsulation ppp
dialer in-band
dialer string 8292
dialer-group 1
pulse-time 1
!
dialer-list 1 protocol ip permit
B)辅助口作拨号备份
Configuration for RouterA:
chat-script MYDIAL "" "atdt 8292" TIMEOUT 60 "CONNECT"
!
interface Serial0
backup delay 0 0
backup interface Async1
ip address 16.3.1.1 255.255.255.0
encapsulation ppp
!
interface Async1
ip address 16.3.2.1 255.255.255.0
encapsulation ppp
keepalive 9
async default routing
async dynamic address
async dynamic routing
async mode dedicated
dialer in-band
dialer string 8292
dialer-group 1
!
dialer-list 1 protocol ip permit
!
line aux 0
script dialer MYDIAL
modem InOut
transport output none
stopbits 1
flowcontrol hardware
speed 9600
Subinterface Example(Frame> Configuration for RouterA:
interface serial 0
encapsulation frame-relay
interface s 0.1 multipoint
ip address 11.10.11.1 255.255.255.0
frame-relay interface-dlci 41
frame-relay interface-dlci 42
Configuration for RouterC:
interface serial 0
encapsulation frame-relay
interface s 0.1 point-to-point
ip address 11.10.16.2 255.255.255.0
frame-relay interface-dlci 46
Configuration for RouterB:
interface serial 0
encapsulation frame-relay
interface s 0.1 multipoint
ip address 11.10.11.3 255.255.255.0
frame-relay interface-dlci 43
frame-relay interface-dlci 44
!
interface s 0.2 point-to-point
ip address 11.10.13.1 255.255.255.0
frame-relay interface-dlci 48
Frame> Configuration for RouterA:
frame-relay switching
!
int s 0
no ip address
frame-relay encapsulation
frame-relay route 167 tun0 43
frame-relay intf-type dce
!
int s 1
ip address 131.108.100.1 255.255.255.0
!
int tu 0
tunnel source serial 1
tunnel destination 131.108.13.2
Configuration for RouterB:
frame-relay switching
!
int s 0
no ip address
frame-relay encapsulation
frame-relay route 9 tun0 43
frame-relay intf-type dce
!
int s 1
ip address 131.108.13.2 255.255.255.0
!
int tu 0
tunnel source serial 1
tunnel destination 131.108.100.1
Channelized E1 Interface Example
假设是7500系列路由器,E1接口(MIP板)在插槽4上面.一个channel-group可对应多个时间槽,本例中serial4/0:1有5*64Kbps的数率.
Configuration for Router:
controller E1 0
framing NO-CRC4
channel-group 0 timeslots 1
channel-group 1 timeslots 2,7-9,20 speed 64
!
interface Serial4/0:0
ip address 16.217.30.2 255.255.255.252
encapsulation ppp
!
interface Serial4/0:1
ip address 16.205.30.5 255.255.255.252
X.25 Example
在配置X.25时,为减少路由交换引起的呼叫,通常用静态路由.而当一对多情况下,
不在一个子网中用subinterface配置.
Configuration for Router:
interface serial 0
ip address 131.108.100.1 255.255.255.0
encapsulation x25
x25 address 041673226839
x25 htc 16
x25 map ip 131.108.100.2 041675222222
int s 0.1
ip address 131.108.101.1 255.255.255.0
x25 map ip 131.108.101.2 041674222222
!
ip route 131.108.100.0 255.255.255.0 131.108.100.2
ip route 131.108.101.0 255.255.255.0 131.108.101.2
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