总部采用cisco3725路由器，配置NM-1CE1U模块，通过2M PRI线路接入PSTN网，用于各分支机构的拨入，可支持模拟信号和数字信号的拨入；B采用cisco2621XM,配置WIC-1AM接口卡，C采用cisco2621XM,配置WIC-1B-S/T接口卡。

 

 

 

10.1/24      10.254/24   E1                   11.254/24   11.1/24

                                         12.254/24      12.1/24

 

 

 

//router a

username routerc pass cisco

username routerb pass cisco

 

isdn switch=type primary-net5

 

  framing no-crc4

  linecode hdb3    //指定ISDN的PRI的线路编码格式为hdb3

  pri-group timeslots 1-31  //把PRI接口分成31个信道，其中第16个管理

 

int s1/0:15    //进入逻辑接口s0/0:15(管理信道)

  description connected to routerc

  ip unumbered fa0/0

  encap ppp

  dialer-group 1

  isdn switch-type primary-net5

  isdn incoming-voice modem   //将模拟MODEM呼叫转接到内部数字MODEM

  peer default ip address pool isdnpoolxxx  //为拨入呼叫从POOL分配IP

  ppp auth pap

 

int group-async1  //建立一个异步拨号组

  ip unnumbered fa0/0

  encap ppp

 

async mode interactive  //串行口建立链路方式，默认为dedicate，直接方式，拨号成功后，直接采用链路层协议配置参数建立链路；interactive，交互方式，拨号成功后，主叫方向对端发送配置命令(与用户从远端手工键入配置命令效果相同)，设置对端的链路层协议工作参数，然后建立链路。比较常用的是直接方式，但在与同样支持交互方式的路由器(如cisco路由器等)互连时，采用交互方式显得不更为灵活。

 

  peer default ip address pool pstnpoolxxx

  ppp authe pap if-needed

  group-range 33 62  //指定此模拟拨号组对应的端口

 

int fa0/0

  description 192.168.10.254 255.255.255.0

 

dialer-list 1 protocol ip permit

 

ip local pool isdnpoolxxx 192.168.10.201 192.168.10.220

ip local pool pstnpoolxxx 192.168.10.221 192.168.10.240

 

snmp-server community public RO

no snmp-server location

no snmp-server contact

 

  autoselect during-login

  autoselect ppp

  login local

  modem inout  //配置端口为允许拨入和拨出

  modem autoconfigure discovery //配置MODEM自动识别

  autocommand ppp default

 

 

//router b

username routera pass cisco

 

chat-script dialout "" "AT" TIMEOUT 30 OK "ATDT\T" TIMEOUT 30 CONNECT \c      //定义拨号脚本

 

int fa0/0

  description connected to lan b

  ip addr 192.168.11.254 255.255.255.0

  ip nat inside

 

  description connected to route a

  ip address negotiated

  async mode interactive

  dialer in-band  //设定接口为按需拨号方式(DDR)

  dialer string 68001000

  dialer-group 1

  ppp authe pap

  ppp pap sent-username routeb pass cisco

  ip nat outside

 

dialer-list 1 protocol ip permit

 

ip nat inside source-list 1 interface async 1 overload

 

access-list 1 permit any

 

ip route 0.0.0.0 0.0.0.0 async1

 

  autoselect during-login

  autoselect ppp

  modem inout

  modem autoconfigure discovery

  autocommand ppp

  script dialer dialoutxxx   //指定拨出脚本

  flowcontrol hardware

 

 

 

//router c

username routera pass cisco

 

isdn switch-type basic-net3

 

  description connected to lan c

  ip addr 192.168.12.254 255.255.255.0

  ip nat inside

 

  description connected to routera

  ip addr negotiation

  isdn switch-type basic-net3

  encap ppp

  ppp auteh pap

  ppp pap sent-username routerc pass cisco

  dialer in-band

  dialer string 68001000

  dialer-group 1

  ip nat outside

 

dialer-list 1 protocol ip permit

 

access-list 1 permit any

 

ip route 0.0.0.0 0.0.0.0 bri 0/0