【正文】 全局設(shè)置 ： 任務(wù) 命令 設(shè)置用戶名和密碼 username username password password 設(shè)置用戶的 IP 地址池 ip local pool {default | poolname lowipaddress [highipaddress。電話網(wǎng)絡(luò)的應(yīng)用一般可分為兩種類型，一種是同等級(jí)別機(jī)構(gòu)之間以按需撥號(hào) (DDR)的方式實(shí)現(xiàn)互連，一種是 ISP 為撥號(hào)上網(wǎng)為用戶提供的遠(yuǎn)程訪問(wèn)服務(wù)的功能。 set system c765 c765 set multidestination on c765 set switch 3 c765 set ppp multilink on c765 cd lan c765:LAN set ip routing on c765:LAN set ip address c765:LAN set ip mask c765:LAN set briding off c765:LANcd c765 set user remote New user remote being created c765:remote set ip routing on c765:remote set bridging off c765:remote set ip framing none c765:remote set ppp clientname 263 c765:remote set ppp password client Enter new Password: 263 ReType new Password: 263 c765:remote set ppp authentication out none c765:remote set ip address c765:remote set ip mask c765:remote set ppp address negotiation local on c765:remote set ip pat on c765:remote set ip route destination c765:remote set number 2633 c765:remote set active 命令描述如下： 任務(wù) 命令 設(shè)置路由器系統(tǒng)名稱 set system c765 允許路由器呼叫多個(gè)目的地 set multidestination on 設(shè)置 ISDN 交換機(jī)類型為NET3 set switch 3 允許點(diǎn)到點(diǎn)間多條通道連接實(shí)現(xiàn)負(fù)載均衡 set ppp multilink on 關(guān)掉橋接 set briding off 建立用戶預(yù)制文件用于設(shè)置撥號(hào)連接參數(shù) 可以設(shè)置多個(gè)用戶預(yù)制文件用于相同的物理端口對(duì)應(yīng)于不同的連接。 dialer map protocol address name hostname class classname dialstring 設(shè)置接口支持 PPP 回?fù)? ppp callback accept 在全局模式下為 PPP 回?fù)茉O(shè)置映射類別 mapclass dialer classname 通過(guò)查找注冊(cè)在 dialer map里的主機(jī)名來(lái)決定回?fù)?. dialer callbackserver [username] 設(shè)置接口要求 PPP 回?fù)? ppp callback request 設(shè)置如下： Router1: hostname router1 user router2 password cisco ! isdn switchtype basic3 ! interface bri 0 ip address encapsulation ppp dialer map ip name router2 class s3 572 dialer loadthreshold 80 ppp callback accept ppp multilink dialergroup 1 ppp authentication chap ！ mapclass dialer s3 dialer callbackserver username dialerlist 1 protocol ip permit ! Router2: hostname router2 user router1 password cisco ! isdn switchtype basic3 ! interface bri 0 ip address encapsulation ppp dialer map ip name router1 571 dialer loadthreshold 80 ppp callback request ppp multilink dialergroup 1 ppp authentication chap ！ dialerlist 1 protocol ip permit ! 相關(guān)調(diào)試命令 ： 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 舉例 :執(zhí)行 debug dialer 命令觀察 router2 呼叫 router1,router1 回?fù)?router2 的過(guò)程 . router1debug dialer router2ping router1 00:03:50: %LINK3UPDOWN: 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: %LINK3UPDOWN: Interface BRI0:1, changed state to down 00:03:50: BRI0:1: disconnecting call 00:03:50: BRI0:1: disconnecting call 00:03:51: %LINK3UPDOWN: 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: %LINK3UPDOWN: 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: %LINK3UPDOWN: Interface BRI0:1, changed state to up 00:04:05: BRI0:1: No callback negotiated 00:04:05: %LINK3UPDOWN: Interface VirtualAccess1, changed state to up 00:04:05: dialer Protocol up for Vi1 00:04:06: %LINEPROTO5UPDOWN: Line protocol on Interface BRI0:1, changed state to up 00:04:06: %LINEPROTO5UPDOWN: Line protocol on Interface VirtualAccess1, chang ed state to up 00:04:11: %ISDN6CONNECT: Interface BRI0:1 is now connected to 572 router1 4. ISDN 訪問(wèn)首都在線 263 網(wǎng)實(shí)例 : 本地局部網(wǎng)地址為 ,屬于保留地址，通過(guò) NAT 地址翻譯功能，局域網(wǎng)用戶可以通過(guò) ISDN 上 263 網(wǎng)訪問(wèn) Inter。T 5ESS switch type for the . (ISDN PRI only) primarydms100 NT DMS100 switch type for the . (ISDN PRI only) New Zealand basicnz3 New Zealand Net3 switches 3. ISDN 實(shí)現(xiàn) DDR（ dialondemand routing）實(shí)例 : 設(shè)置如下： Router1: hostname router1 user router2 password cisco ! isdn switchtype basic3 ! interface bri 0 ip address encapsulation ppp dialer map ip name router2 572 dialer loadthreshold 80 ppp multilink dialergroup 1 ppp authentication chap ！ dialerlist 1 protocol ip permit ! Router2: hostname router2 user router1 password cisco ! isdn switchtype basic3 ! interface bri 0 ip address encapsulation ppp dialer map ip name router1 571 dialer loadthreshold 80 ppp multilink dialergroup 1 ppp authentication chap ！ dialerlist 1 protocol ip permit ! Cisco 路由器同時(shí)支持回?fù)芄δ?，我們將路由?Router1 作為 Callback Server,Router2 作為 Callback Client。T basic rate switches basicdms100 NT DMS100 basic rate switches basicni1 National ISDN1 switches primary4ess ATamp。 按區(qū)域分關(guān)鍵字 交換機(jī)類型 Australia basicts013 Australian TS013 switches Europe basic1tr6 German 1TR6 ISDN switches basicnw3 Norway NET3 switches (phase 1) basic3 NET3 ISDN switches (UK, Denmark, and other nations)。我國(guó)電話局所提供 ISDN PRI 為 30B+D。在北美和日本， ISDN 的主速率接口（ PRI）提供 23 個(gè) B 信道和 1 個(gè) D 信道，總速率可達(dá) ，其中 D 信道速率為 64Kbps。BRI 的 B 信道速率為 64Kbps,用于傳輸用戶數(shù)據(jù)。 3. 幀中繼 point to point 配置實(shí)例： Router1: interface serial 0 encapsulation framerelay ! interface serial pointtopoint ip address framereply interfacedlci 105 ! interface serial pointtopoint ip address framereply interfacedlci 102 ! interface serial pointtopoint ip address framereply interfacedlci 104 ! Router2: interface se