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至顶网网络频道ISDN 协议配置

ISDN 协议配置

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由数字电话和数据传输服务两部分组成,一般由电话局提供这种服务。举例:执行debug dialer命令观察router2呼叫router1,router1回拨router2的过程.

作者:中国IT实验室 2007年9月18日

关键字: 路由协议 EIGRP igrp SNMP CISCO 网络协议

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  1.    综合数字业务网(ISDN)

  

  综合数字业务网(ISDN)由数字电话和数据传输服务两部分组成,一般由电话局提供这种服务。ISDN的基本速率接口(BRI)服务提供2个B信道和1个D信道(2B+D)。BRI的B信道速率为64Kbps,用于传输用户数据。D信道的速率为16Kbps,主要传输控制信号。在北美和日本,ISDN的主速率接口(PRI)提供23个B信道和1个D信道,总速率可达1.544Mbps,其中D信道速率为64Kbps。而在欧洲、澳大利亚等国家,ISDN的PRI提供30个B信道和1个64Kbps D信道,总速率可达2.048Mbps。我国电话局所提供ISDN PRI为30B+D。

  

  2.    基本命令

  

   

  

  注:1.交换机类型如下表,国内交换机一般为basic-net3。

  

   

  

  3.    ISDN实现DDR(dial-on-demand routing)实例:

  

   

  

  设置如下:

  

  Router1:

  

  hostname router1

  

  user router2 password cisco

  

  !

  

  isdn switch-type basic-net3

  

  !

  

  interface bri 0

  

  ip address 192.200.10.1 255.255.255.0

  

  encapsulation ppp

  

  dialer map ip 192.200.10.2 name router2 572

  

  dialer load-threshold 80

  

  ppp multilink

  

  dialer-group 1

  

  ppp authentication chap

  

  !

  

  dialer-list 1 protocol ip permit

  

  !

  

  Router2:

  

  hostname router2

  

  user router1 password cisco

  

  !

  

  isdn switch-type basic-net3

  

  !

  

  interface bri 0

  

  ip address 192.200.10.2 255.255.255.0

  

  encapsulation ppp

  

  dialer map ip 192.200.10.1 name router1 571

  

  dialer load-threshold 80 

  

  ppp multilink

  

  dialer-group 1

  

  ppp authentication chap

  

  !

  

  dialer-list 1 protocol ip permit

  

  !

  

  Cisco路由器同时支持回拨功能,我们将路由器Router1作为Callback Server,Router2作为Callback Client。

  

  与回拨相关命令:

  

   

  设置如下:

  

  Router1:

  

  hostname router1

  

  user router2 password cisco

  

  !

  

  isdn switch-type basic-net3

  

  !

  

  interface bri 0

  

  ip address 192.200.10.1 255.255.255.0

  

  encapsulation ppp

  

  dialer map ip 192.200.10.2 name router2 class s3 572

  

  dialer load-threshold 80

  

  ppp callback accept

  

  ppp multilink

  

  dialer-group 1

  

  ppp authentication chap

  

  !

  

  map-class dialer s3

  

  dialer callback-server username

  

  dialer-list 1 protocol ip permit

  

  !

  

  Router2:

  

  hostname router2

  

  user router1 password cisco

  

  !

  

  isdn switch-type basic-net3

  

  !

  

  interface bri 0

  

  ip address 192.200.10.2 255.255.255.0

  

  encapsulation ppp

  

  dialer map ip 192.200.10.1 name router1 571

  

  dialer load-threshold 80

  

  ppp callback request 

  

  ppp multilink

  

  dialer-group 1

  

  ppp authentication chap

  

  !

  

  dialer-list 1 protocol ip permit

  

  !

  

  相关调试命令:

  

  debug dialer

  

  debug isdn event

  

  debug isdn q921

  

  debug isdn q931

  

  debug ppp authentication

  

  debug ppp error

  

  debug ppp negotiation

  

  debug ppp packet

  

  show dialer

  

  show isdn status

  

  举例:执行debug dialer命令观察router2呼叫router1,router1回拨router2的过程.

  

  router1#debug dialer

  

  router2#ping 192.200.10.1

  

  router1#

  

  00:03:50: %LINK-3-UPDOWN: Interface BRI0:1, changed state to up

  

  00:03:50: BRI0:1:PPP callback Callback server starting to router2 572

  

  00:03:50: BRI0:1: disconnecting call

  

  00:03:50: %LINK-3-UPDOWN: Interface BRI0:1, changed state to down

  

  00:03:50: BRI0:1: disconnecting call

  

  00:03:50: BRI0:1: disconnecting call

  

  00:03:51: %LINK-3-UPDOWN: Interface BRI0:2, changed state to up

  

  00:03:52: callback to router2 already started

  

  00:03:52: BRI0:2: disconnecting call

  

  00:03:52: %LINK-3-UPDOWN: Interface BRI0:2, changed state to down

  

  00:03:52: BRI0:2: disconnecting call

  

  00:03:52: BRI0:2: disconnecting call

  

  00:04:05: : Callback timer expired

  

  00:04:05: BRI0:beginning callback to router2 572

  

  00:04:05: BRI0: Attempting to dial 572

  

  00:04:05: Freeing callback to router2 572

  

  00:04:05: %LINK-3-UPDOWN: Interface BRI0:1, changed state to up

  

  00:04:05: BRI0:1: No callback negotiated

  

  00:04:05: %LINK-3-UPDOWN: Interface Virtual-Access1, changed state to up

  

  00:04:05: dialer Protocol up for Vi1

  

  00:04:06: %LINEPROTO-5-UPDOWN: Line protocol on Interface BRI0:1, changed state

  

  to up

  

  00:04:06: %LINEPROTO-5-UPDOWN: Line protocol on Interface Virtual-Access1, chang

  

  ed state to up

  

  00:04:11: %ISDN-6-CONNECT: Interface BRI0:1 is now connected to 572

  

  #router1

  

  4.   ISDN访问首都在线263网实例:

  

  

   

  

  本地局部网地址为10.0.0.0/24,属于保留地址,通过NAT地址翻译功能,局域网用户可以通过ISDN上263网访问Internet。263的ISDN电话号码为2633,用户为263,口令为263,所涉及的命令如下表:

  

   

  

  具体配置如下:

  

  hostname Cisco2503

  

  !

  

  isdn switch-type basic-net3

  

  !

  

  ip subnet-zero

  

  no ip domain-lookup

  

  ip routing

  

  !

  

  interface Ethernet 0

  

  ip address 10.0.0.1 255.255.255.0

  

  ip nat inside

  

  no shutdown

  

  !

  

  interface Serial 0

  

  shutdown

  

  no description

  

  no ip address

  

  !

  

  interface Serial 1

  

  shutdown

  

  no description

  

  no ip address

  

  !

  

  interface bri 0

  

  ip address negotiated

  

  ip nat outside

  

  encapsulation ppp

  

  ppp authentication pap callin

  

  ppp multilink

  

  dialer-group 1

  

  dialer hold-queue 10

  

  dialer string 2633 

  

  dialer idle-timeout 120

  

  ppp pap sent-username 263 password 263

  

  no cdp enable

  

  no ip split-horizon

  

  no shutdown

  

  !

  

  ip classless

  

  !

  

  ! Static Routes

  

  !

  

  ip route 0.0.0.0 0.0.0.0 bri 0

  

  !

  

  ! Access Control List 2

  

  !

  

  access-list 2 permit any

  

  !

  

  dialer-list 1 protocol ip permit

  

  !

  

  ! Dynamic NAT

  

  !

  

  ip nat inside source list 2 interface bri 0 overload

  

  snmp-server communit

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