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Cisco路由器配置DDR拨号

2019-11-05 00:32:54
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  dial-on demand routing (ddr)是用公共电话网提供了网络连接。通常的,广域网大多数使用专线连接的,路由器连接到类似MODEM OR ISDNTAS 的数据终端DCE设备上,他们支持同步V.25BITS协议,你可以用SCRipTS AND DIALER命令设定拨号串。
  
  DDR比较适用于用户对数率要求不高,偶然有数据传输或只是在特定时候传输数据,比如银行每晚传送报表等等情况下。
  
  当一个感爱好的包到达路由器时,产生一个DDR请求,路由器发送呼叫建立信息给指定的串口的DCE设备,这个呼叫就把本地的和远程的设备连接起来,一旦没有数据传输,空闲时间开始记时,超过设置的记时时间,连接终止。DDR现在都用静态路由来传输数据,避免路由交换引起的DDR拨号。和XNS可以通过DDR路由寻址,同步串口,异步串口和ISDN端口可以配置成到一个或多个目的地的DDR连接。
  
  下面是一个典型的DDR连接:
  
  在配置DDR过程中,我们可以把一个或几个物理端口配置成一个逻辑拨号接口,他可以是同步V.25方式,同步DYR启动拨号或异步CHATSCRIPT方式。
  
  具体配置:
  !
  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 55551234
  !
  dialer idle-timeout 300
  dialer backup example
  A) 同步V.25bits方式
  configuration for routerA:
  interface serial 10:0
  backup delay 0 10
  backup interface serial 110
  ip address 16.217.30.2 255.255.255.252
  !
  interface serial 110
  ip address 16.30.16.81 255.255.255.25.0
  encapsulation ppp
  dialer in-band
  dialer string 8292
  dialer-group 1
  pulse-time 1
  !
  dilar-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 serial 0
  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 string 8292
  dialer-group 1
  !
  dialer-list 1 protocol ip permit
  !
  line aux 0
  script dialer mydial
  modeinout
  transport output none
  stopbits 1
  flowcontrol hardware
  speed 9600
  subinterface example (frame realay)
  configuration for routerA:
  interface serial 0
  encapsulation frame-relay
  interface serial 0.1 multipoint
  ip address 11.10.11.1 255.255.255.0
  frame-relay interface-dlci 41
  frame-relay interface-dlci42
  
  configuration for routerC:
  interface serial 0
  encapsulation frame-relay
  interface serial 0.1 point-point
  ip address 11.10.16.2 255.255.255.0
  frame-realy interface-dlci 46
  
  configuration for routerB:
  
  interface serial 0
  encapsulation frame-relay
  interface serial 0.1 multipoint
  ip address 11.10.11.3 255.255.255.0
  frame-relay interface-dlci 43
  frame-relay interface-dlci 44
  !
  interface serial 0.2 point-point
  ip address 11.10.13.1 255.255.255.0
  frame-realy interface-dlci 48
  
  frame relay switching example
  configuration for routerA:
  frame-relay switching
  no ip address
  frame-relay encapsulation
  frame-relay route 163 tun0 43
  frame-relay intf-type dce
  !
  interface serial0
  ip address 131.108.100.1 255.255.255.0
  !
  interface tu 0
  tunnel source serial 1
  tunnel destintion 131.108.13.2
  
  configuration for routerB:
  frame-relay switching
  !
  interface serial 0
  no Ip address
  frame-relay encapsulation
  frame-relay router 9 tun0 43
  frame-relay interface-type dce
  !
  int tu 0
  tunnel source serial 1
  tunnel destination 131.108.100.1
  
  channelized E1interface 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*64的速率
  configuration for router :
  controller e1 0
  framing no-crc4
  chanel-group 0 timeslots1
  channel-group 1 timeslots 2,7-9,20 speed 64
  !
  interface serial4/0:0
  Ipaddress 16.217.30.2 255.255.255.252
  Encapsulation ppp
  !
  interface serial 4/0:1
  ip address 16.205030.5 255.255.255.252
  
  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subinface 配置
  
  configuration for router:
  interface serial 0
  ip address 131.108.100.1 255.255.255.0
  encapsulation X.25
  X.25 address 041673226839
  x.25 htc 16
  x.25 map ip 131.108.100.2 041675222222
  int s 0.1
  ip address 131.108.101.1 255.255.255.0
  x.25 mapip 131.108.101.2 041674222222
  !
  ip router 131.108.100.0 255.255.255.0 131.108.100.2
  ip router 131.108.101.0 255.255.255.0 131.108.101.2


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