ISDN 协议配置

1、ISDN协议配置刷钻代码 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

2、+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 router1user router2 password cisco!isdn switch-type basic-net3!interface bri 0ip address 192.200.10.1 255.255.255.0encapsulation pppdialer map ip 192.200.10.2 name router2 572 dialer load-threshold 8

3、0ppp multilinkdialer-group 1ppp authentication chap!dialer-list 1 protocol ip permit!Router2:hostname router2user router1 password cisco!isdn switch-type basic-net3!interface bri 0ip address 192.200.10.2 255.255.255.0encapsulation pppdialer map ip 192.200.10.1 name router1 571 dialer load-threshold

4、80ppp multilinkdialer-group 1ppp 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 router1user router2 password cisco!isdn switch-type basic-net3!interface bri 0ip address 192.200.10.1255.255.25

5、5.0encapsulation pppdialer map ip 192.200.10.2 name router2 class s3 572dialer load-threshold 80ppp callback acceptppp multilinkdialer-group 1ppp authentication chap!map-class dialer s3dialer callback-server usernamedialer-list 1 protocol ip permit!Router2:hostname router2user router1 password cisco

6、!isdn switch-type basic-net3!interface bri 0ip address 192.200.10.2 255.255.255.0 encapsulation pppdialer map ip 192.200.10.1 name router1 571 dialer load-threshold 80ppp callback requestppp multilinkdialer-group 1ppp authentication chap!dialer-list 1 protocol ip permit!相关调试命令:debug dialerdebug isdn

7、 eventdebug isdn q921debug isdn q931debug ppp authenticationdebug ppp errordebug ppp negotiationdebug ppp packetshow dialershow 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 dialerrouter2#ping 192.200.10.1router1#00:03:50: %LINK-3-UPDOWN: Interface BRI0:1, change

8、d state to up00:03:50: BRI0:1:PPP callback Callback server starting to router2 57200:03:50: BRI0:1: disconnecting call00:03:50: %LINK-3-UPDOWN: Interface BRI0:1, changed state to down00:03:50: BRI0:1: disconnecting call00:03:50: BRI0:1: disconnecting call00:03:51: %LINK-3-UPDOWN: Interface BRI0:2,ch

9、anged state to up00:03:52: callback to router2 already started00:03:52: BRI0:2: disconnecting call00:03:52: %LINK-3-UPDOWN: Interface BRI0:2, changed state to down00:03:52: BRI0:2: disconnecting call00:03:52: BRI0:2: disconnecting call00:04:05: : Callback timer expired00:04:05: BRI0:beginning callba

10、ck to router2 57200:04:05: BRI0: Attempting to dial 57200:04:05: Freeing callback to router2 57200:04:05: %LINK-3-UPDOWN: Interface BRI0:1, changed state to up00:04:05: BRI0:1: No callback negotiated00:04:05: %LINK-3-UPDOWN: Interface Virtual-Access1, changed state to up00:04:05: dialer Protocol up

11、for Vi100:04:06: %LINEPROTO-5-UPDOWN: Line protocol on Interface BRI0:1, changed stateto up00:04:06: %LINEPROTO-5-UPDOWN: Line protocol on Interface Virtual-Access1, changed state to up00:04:11: %ISDN-6-CONNECT: Interface BRI0:1 is now connected to 572#router14. ISDN访问首都在线263网实例:本地局部网地址为10.0.0.0/24,

12、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-zerono ip domain-lookupip routing!interface Ethernet 0ip address 10.0.0.1 255.255.255.0 ip nat insideno shutdown!interface Serial 0shutdownno des

13、criptionno ip address!interface Serial 1shutdownno 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 !