primary-net5 NET5 switches (UK and Europe) vn2 French VN2 ISDN switches vn3 French VN3 ISDN switches Japan ntt Japanese NTT ISDN switches primary-ntt Japanese ISDN PRI switches North America basic-5ess AT&T basic rate switches basic-dms100 NT DMS-100 basic rate switches basic-ni1 National ISDN-1 switches primary-4ess AT&T 4ESS switch type for the U.S. (ISDN PRI only) primary-5ess AT&T 5ESS switch type for the U.S. (ISDN PRI only) primary-dms100 NT DMS-100 switch type for the U.S. (ISDN PRI only) New Zealand basic-nznet3 New Zealand Net3 switches 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: 任务 命令 映射协议地址和电话号码，并在接口上使用在全局模式下定义的PPP回拨的映射类别。 dialer map protocol address name hostname class classname dial-string 设置接口支持PPP回拨 ppp callback accept 在全局模式下为PPP回拨设置映射类别 map-class dialer classname 通过查找注册在dialer map里的主机名来决定回拨. dialer callback-server [username] 设置接口要求PPP回拨 ppp callback request 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 !
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