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} [if-needed] [list-name | default] [callin]
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 Relay Switching Example
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 idle-timeout 300
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 Relay)
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 Relay Switching Example
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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本文标题: CISCO配置命令大全（3）
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