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  • 思科路由器廣域網(wǎng)協(xié)議設(shè)置

    時(shí)間:2023-03-08 19:46:30 思科認(rèn)證 我要投稿
    • 相關(guān)推薦

    思科路由器廣域網(wǎng)協(xié)議設(shè)置

      思科(Cisco)路由器是通過(guò)何種方式,來(lái)提供超越基本數(shù)據(jù)訪問(wèn)的優(yōu)勢(shì),并作為可實(shí)現(xiàn)最高生產(chǎn)率和投資回報(bào)的集成路由系統(tǒng)的一部分,提供話音、安全和無(wú)線等服務(wù)。下面小編準(zhǔn)備了關(guān)于思科路由器廣域網(wǎng)協(xié)議設(shè)置,歡迎大家參考!

    思科路由器廣域網(wǎng)協(xié)議設(shè)置

      一、HDLC

      HDLC是CISCO路由器使用的缺省協(xié)議,一臺(tái)新路由器在未指定封裝協(xié)議時(shí)默認(rèn)使用HDLC封裝。

      1. 有關(guān)命令

      端口設(shè)置

    任務(wù) 命令
    設(shè)置HDLC封裝 encapsulation hdlc
    設(shè)置DCE端線路速度 clockrate speed
    復(fù)位一個(gè)硬件接口 clear interface serial unit
    顯示接口狀態(tài) show interfaces serial [unit] 1
      注:1.以下給出一個(gè)顯示Cisco同步串口狀態(tài)的例子.

      Router#show interface serial 0

      Serial 0 is up, line protocol is up

      Hardware is MCI Serial

      Internet address is 150.136.190.203, subnet mask is 255.255.255.0

      MTU 1500 bytes, BW 1544 Kbit, DLY 20000 usec, rely 255/255, load 1/255

      Encapsulation HDLC, loopback not set, keepalive set (10 sec)

      Last input 0:00:07, output 0:00:00, output hang never

      Output queue 0/40, 0 drops; input queue 0/75, 0 drops

      Five minute input rate 0 bits/sec, 0 packets/sec

      Five minute output rate 0 bits/sec, 0 packets/sec

      16263 packets input, 1347238 bytes, 0 no buffer

      Received 13983 broadcasts, 0 runts, 0 giants

      2 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 2 abort

      22146 packets output, 2383680 bytes, 0 underruns

      0 output errors, 0 collisions, 2 interface resets, 0 restarts

      1 carrier transitions

      2. 舉例

      設(shè)置如下:

      Router1:

      interface Serial0

      ip address 192.200.10.1 255.255.255.0

      clockrate 1000000

      Router2:

      interface Serial0

      ip address 192.200.10.2 255.255.255.0

      !

      3. 舉例使用E1線路實(shí)現(xiàn)多個(gè)64K專(zhuān)線連接.

      相關(guān)命令:

     
     
    任務(wù) 命令
    進(jìn)入controller配置模式 controller {t1 | e1} number
    選擇幀類(lèi)型  framing {crc4 | no-crc4}
    選擇line-code類(lèi)型  linecode {ami | b8zs | hdb3}
    建立邏輯通道組與時(shí)隙的映射  channel-group number timeslots range1
    顯示controllers接口狀態(tài) show controllers e1 [slot/port]2
      注: 1. 當(dāng)鏈路為T(mén)1時(shí),channel-group編號(hào)為0-23, Timeslot范圍1-24; 當(dāng)鏈路為E1時(shí), channel-group編號(hào)為0-30, Timeslot范圍1-31.

      2.使用show controllers e1觀察controller狀態(tài),以下為幀類(lèi)型為crc4時(shí)controllers正常的狀態(tài).

      Router# show controllers e1

      e1 0/0 is up.

      Applique type is Channelized E1 - unbalanced

      Framing is CRC4, Line Code is HDB3 No alarms detected.

      Data in current interval (725 seconds elapsed):

      0 Line Code Violations, 0 Path Code Violations

      0 Slip Secs, 0 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins

      0 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 0 Unavail Secs

      Total Data (last 24 hours) 0 Line Code Violations, 0 Path Code Violations,

      0 Slip Secs, 0 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins,

      0 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 0 Unavail Secs

      以下例子為E1連接3條64K專(zhuān)線, 幀類(lèi)型為NO-CRC4,非平衡鏈路,路由器具體設(shè)置如下:

      shanxi#wri t

      Building configuration...

      Current configuration:

      !

      version 11.2

      no service udp-small-servers

      no service tcp-small-servers

      !

      hostname shanxi

      !

      enable secret 5 $1$XN08$Ttr8nfLoP9.2RgZhcBzkk/

      enable password shanxi

      !

      !

      ip subnet-zero

      !

      controller E1 0

      framing NO-CRC4

      channel-group 0 timeslots 1

      channel-group 1 timeslots 2

      channel-group 2 timeslots 3

      !

      interface Ethernet0

      ip address 133.118.40.1 255.255.0.0

      media-type 10BaseT

      !

      interface Ethernet1

      no ip address

      shutdown

      !

      interface Serial0:0

      ip address 202.119.96.1 255.255.255.252

      no ip mroute-cache

      !

      interface Serial0:1

      ip address 202.119.96.5 255.255.255.252

      no ip mroute-cache

      !

      interface Serial0:2

      ip address 202.119.96.9 255.255.255.252

      no ip mroute-cache

      !

      no ip classless

      ip route 133.210.40.0 255.255.255.0 Serial0:0

      ip route 133.210.41.0 255.255.255.0 Serial0:1

      ip route 133.210.42.0 255.255.255.0 Serial0:2

      !

      line con 0

      line aux 0

      line vty 0 4

      password shanxi

      login

      !

      end

      二、PPP

      PPP(Point-to-Point Protocol)是SLIP(Serial Line IP protocol)的繼承者,它提供了跨過(guò)同步和異步電路實(shí)現(xiàn)路由器到路由器(router-to-router)和主機(jī)到網(wǎng)絡(luò)(host-to-network)的連接。

      CHAP(Challenge Handshake Authentication Protocol)和PAP(Password Authentication Protocol) (PAP)通常被用于在PPP封裝的串行線路上提供安全性認(rèn)證。使用CHAP和PAP認(rèn)證,每個(gè)路由器通過(guò)名字來(lái)識(shí)別,可以防止未經(jīng)授權(quán)的訪問(wèn)。

      CHAP和PAP在RFC 1334上有詳細(xì)的說(shuō)明。

      1. 有關(guān)命令

      端口設(shè)置

    任務(wù) 命令
    設(shè)置PPP封裝 encapsulation ppp1
    設(shè)置認(rèn)證方法 ppp authentication {chap | chap pap | pap chap | pap} [if-needed] [list-name | default] [callin]
    指定口令 username name password secret
    設(shè)置DCE端線路速度 clockrate speed
      注:1、要使用CHAP/PAP必須使用PPP封裝。在與非Cisco路由器連接時(shí),一般采用PPP封裝,其它廠家路由器一般不支持Cisco的HDLC封裝協(xié)議。

      2. 舉例

      路由器Router1和Router2的S0口均封裝PPP協(xié)議,采用CHAP做認(rèn)證,在Router1中應(yīng)建立一個(gè)用戶,以對(duì)端路由器主機(jī)名作為用戶名,即用戶名應(yīng)為router2。同時(shí)在Router2中應(yīng)建立一個(gè)用戶,以對(duì)端路由器主機(jī)名作為用戶名,即用戶名應(yīng)為router1。所建的這兩用戶的password必須相同。

      設(shè)置如下:

      Router1:

      hostname router1

      username router2 password xxx

      interface Serial0

      ip address 192.200.10.1 255.255.255.0

      clockrate 1000000

      ppp authentication chap

      !

      Router2:

      hostname router2

      username router1 password xxx

      interface Serial0

      ip address 192.200.10.2 255.255.255.0

      ppp authentication chap

      三、x.25

      1. X25技術(shù)

      X.25規(guī)范對(duì)應(yīng)OSI三層,X.25的第三層描述了分組的格式及分組交換的過(guò)程。X.25的第二層由LAPB(Link Access Procedure, Balanced)實(shí)現(xiàn),它定義了用于DTE/DCE連接的幀格式。X.25的第一層定義了電氣和物理端口特性。

      X.25網(wǎng)絡(luò)設(shè)備分為數(shù)據(jù)終端設(shè)備(DTE)、數(shù)據(jù)電路終端設(shè)備(DCE)及分組交換設(shè)備(PSE)。DTE是X.25的末端系統(tǒng),如終端、計(jì)算機(jī)或網(wǎng)絡(luò)主機(jī),一般位于用戶端,Cisco路由器就是DTE設(shè)備。DCE設(shè)備是專(zhuān)用通信設(shè)備,如調(diào)制解調(diào)器和分組交換機(jī)。PSE是公共網(wǎng)絡(luò)的主干交換機(jī)。

      X.25定義了數(shù)據(jù)通訊的電話網(wǎng)絡(luò),每個(gè)分配給用戶的x.25 端口都具有一個(gè)x.121地址,當(dāng)用戶申請(qǐng)到的是SVC(交換虛電路)時(shí),x.25一端的用戶在訪問(wèn)另一端的用戶時(shí),首先將呼叫對(duì)方x.121地址,然后接收到呼叫的一端可以接受或拒絕,如果接受請(qǐng)求,于是連接建立實(shí)現(xiàn)數(shù)據(jù)傳輸,當(dāng)沒(méi)有數(shù)據(jù)傳輸時(shí)掛斷連接,整個(gè)呼叫過(guò)程就類(lèi)似我們撥打普通電話一樣,其不同的是x.25可以實(shí)現(xiàn)一點(diǎn)對(duì)多點(diǎn)的連接。其中x.121地址、htc均必須與x.25服務(wù)提供商分配的參數(shù)相同。X.25 PVC(永久虛電路),沒(méi)有呼叫的過(guò)程,類(lèi)似DDN專(zhuān)線。

      2. 有關(guān)命令:

    任務(wù) 命令
    設(shè)置X.25封裝 encapsulation x25 [dce]
    設(shè)置X.121地址 x25 address x.121-address
    設(shè)置遠(yuǎn)方站點(diǎn)的地址映射 x25 map protocol address [protocol2address2[...[protocol9 address9]]]x121-address [option]
    設(shè)置最大的雙向虛電路數(shù) x25 htc citcuit-number1
    設(shè)置一次連接可同時(shí)建立的虛電路數(shù) x25 nvc count2
    設(shè)置x25在清除空閑虛電路前的等待周期 x25 idle minutes
    重新啟動(dòng)x25,或清一個(gè)svc,啟動(dòng)一個(gè)pvc相關(guān)參數(shù) clear x25 {serial number | cmns-interface mac-address} [vc-number] 3
    清x25虛電路 clear x25-vc
    顯示接口及x25相關(guān)信息 show interfaces serial
    show x25 interface
    show x25 map
    show x25 vc
      注:1、虛電路號(hào)從1到4095,Cisco路由器默認(rèn)為1024,國(guó)內(nèi)一般分配為16。

      2、虛電路計(jì)數(shù)從1到8,缺省為1。

      3、在改變了x.25各層的相關(guān)參數(shù)后,應(yīng)重新啟動(dòng)x25(使用clear x25 {serial number | cmns-interface mac-address} [vc-number]或clear x25-vc命令),否則新設(shè)置的參數(shù)可能不能生效。同時(shí)應(yīng)對(duì)照服務(wù)提供商對(duì)于x.25交換機(jī)端口的設(shè)置來(lái)配置路由器的相關(guān)參數(shù),若出現(xiàn)參數(shù)不匹配則可能會(huì)導(dǎo)致連接失敗或其它意外情況。

      3. 實(shí)例:

      3.1. 在以下實(shí)例中每二個(gè)路由器間均通過(guò)svc實(shí)現(xiàn)連接。

      路由器設(shè)置如下:

      Router1:

      interface Serial0

      encapsulation x25

      ip address 192.200.10.1 255.255.255.0

      x25 address 110101

      x25 htc 16

      x25 nvc 2

      x25 map ip 192.200.10.2 110102 broadcast

      x25 map ip 192.200.10.3 110103 broadcast

      !

      Router2:

      interface Serial0

      encapsulation x25

      ip address 192.200.10.2 255.255.255.0

      x25 address 110102

      x25 htc 16

      x25 nvc 2

      x25 map ip 192.200.10.1 110101 broadcast

      x25 map ip 192.200.10.3 110103 broadcast

      !

      Router:

      interface Serial0

      encapsulation x25

      ip address 192.200.10.3 255.255.255.0

      x25 address 110103

      x25 htc 16

      x25 nvc 2

      x25 map ip 192.200.10.1 110101 broadcast

      x25 map ip 192.200.10.2 110102 broadcast

      !

      相關(guān)調(diào)試命令:

      clear x25-vc

      show interfaces serial

      show x25 map

      show x25 route

      show x25 vc

      3.2. 在以下實(shí)例中路由器router1和router2均通過(guò)svc與router連接,但router1和router2不通過(guò)svc直接連接,此三個(gè)路由器的串口運(yùn)行RIP路由協(xié)議,使用了子接口的概念。由于使用子接口,router1和router2均學(xué)習(xí)到了訪問(wèn)對(duì)方局域網(wǎng)的路徑,若不使用子接口,router1和router2將學(xué)不到到對(duì)方局域網(wǎng)的路由。

      子接口(Subinterface)是一個(gè)物理接口上的多個(gè)虛接口,可以用于在同一個(gè)物理接口上連接多個(gè)網(wǎng)。我們知道為了避免路由循環(huán),路由器支持split horizon法則,它只允許路由更新被分配到路由器的其它接口,而不會(huì)再分配路由更新回到此路由被接收的接口。

      無(wú)論如何,在廣域網(wǎng)環(huán)境使用基于連接的接口(象 X.25和Frame Relay),同一接口通過(guò)虛電路(vc)連接多臺(tái)遠(yuǎn)端路由器時(shí),從同一接口來(lái)的路由更新信息不可以再被發(fā)回到相同的接口,除非強(qiáng)制使用分開(kāi)的物理接口連接不同的路由器。Cisco提供子接口(subinterface)作為分開(kāi)的接口對(duì)待。你可以將路由器邏輯地連接到相同物理接口的不同子接口, 這樣來(lái)自不同子接口的路由更新就可以被分配到其他子接口,同時(shí)又滿足split horizon法則。

      Router1:

      interface Serial0

      encapsulation x25

      ip address 192.200.10.1 255.255.255.0

      x25 address 110101

      x25 htc 16

      x25 nvc 2

      x25 map ip 192.200.10.3 110103 broadcast

      !

      router rip

      network 192.200.10.0

      !

      Router2:

      interface Serial0

      encapsulation x25

      ip address 192.200.11.2 255.255.255.0

      x25 address 110102

      x25 htc 16

      x25 nvc 2

      x25 map ip 192.200.11.3 110103 broadcast

      !

      router rip

      network 192.200.11.0

      !

      Router:

      interface Serial0

      encapsulation x25

      x25 address 110103

      x25 htc 16

      x25 nvc 2

      !

      interface Serial0.1 point-to-point

      ip address 192.200.10.3 255.255.255.0

      x25 map ip 192.200.10.1 110101 broadcast

      !

      interface Serial0.2 point-to-point

      ip address 192.200.11.3 255.255.255.0

      x25 map ip 192.200.11.2 110102 broadcast

      !

      router rip

      network 192.200.10.0

      network 192.200.11.0

      四、Frame Relay

      1. 幀中繼技術(shù)

      幀中繼是一種高性能的WAN協(xié)議,它運(yùn)行在OSI參考模型的物理層和數(shù)據(jù)鏈路層。它是一種數(shù)據(jù)包交換技術(shù),是X.25的簡(jiǎn)化版本。它省略了X.25的一些強(qiáng)健功能,如提供窗口技術(shù)和數(shù)據(jù)重發(fā)技術(shù),而是依靠高層協(xié)議提供糾錯(cuò)功能,這是因?yàn)閹欣^工作在更好的WAN設(shè)備上,這些設(shè)備較之X.25的WAN設(shè)備具有更可靠的連接服務(wù)和更高的可靠性,它嚴(yán)格地對(duì)應(yīng)于OSI參考模型的最低二層,而X.25還提供第三層的服務(wù),所以,幀中繼比X.25具有更高的性能和更有效的傳輸效率。

      幀中繼廣域網(wǎng)的設(shè)備分為數(shù)據(jù)終端設(shè)備(DTE)和數(shù)據(jù)電路終端設(shè)備(DCE),Cisco路由器作為 DTE設(shè)備。

      幀中繼技術(shù)提供面向連接的數(shù)據(jù)鏈路層的通信,在每對(duì)設(shè)備之間都存在一條定義好的通信鏈路,且該鏈路有一個(gè)鏈路識(shí)別碼。這種服務(wù)通過(guò)幀中繼虛電路實(shí)現(xiàn),每個(gè)幀中繼虛電路都以數(shù)據(jù)鏈路識(shí)別碼(DLCI)標(biāo)識(shí)自己。DLCI的值一般由幀中繼服務(wù)提供商指定。幀中繼即支持PVC也支持SVC。

      幀中繼本地管理接口(LMI)是對(duì)基本的幀中繼標(biāo)準(zhǔn)的擴(kuò)展。它是路由器和幀中繼交換機(jī)之間信令標(biāo)準(zhǔn),提供幀中繼管理機(jī)制。它提供了許多管理復(fù)雜互聯(lián)網(wǎng)絡(luò)的特性,其中包括全局尋址、虛電路狀態(tài)消息和多目發(fā)送等功能。

      2. 有關(guān)命令:

      端口設(shè)置

    任務(wù) 命令
    設(shè)置Frame Relay封裝 encapsulation frame-relay[ietf] 1
    設(shè)置Frame Relay LMI類(lèi)型 frame-relay lmi-type {ansi | cisco | q933a}2
    設(shè)置子接口 interface interface-type interface-number.subinterface-number [multipoint|point-to-point]
    映射協(xié)議地址與DLCI frame-relay map protocol protocol-address dlci [broadcast]3
    設(shè)置FR DLCI編號(hào) frame-relay interface-dlci dlci[broadcast]
      注:1.若使Cisco路由器與其它廠家路由設(shè)備相連,則使用Internet工程任務(wù)組(IETF)規(guī)定的幀中繼封裝格式。

      2.從Cisco IOS版本11.2開(kāi)始,軟件支持本地管理接口(LMI)“自動(dòng)感覺(jué)”, “自動(dòng)感覺(jué)”使接口能確定交換機(jī)支持的LMI類(lèi)型,用戶可以不明確配置LMI接口類(lèi)型。

      3.broadcast選項(xiàng)允許在幀中繼網(wǎng)絡(luò)上傳輸路由廣播信息。

      3. 幀中繼point to point配置實(shí)例:

      Router1:

      interface serial 0

      encapsulation frame-relay

      !

      interface serial 0.1 point-to-point

      ip address 172.16.1.1 255.255.255.0

      frame-reply interface-dlci 105

      !

      interface serial 0.2 point-to-point

      ip address 172.16.2.1 255.255.255.0

      frame-reply interface-dlci 102

      !

      interface serial 0.3 point-to-point

      ip address 172.16.4.1 255.255.255.0

      frame-reply interface-dlci 104

      !

      Router2:

      interface serial 0

      encapsulation frame-relay

      !

      interface serial 0.1 point-to-point

      ip address 172.16.2.2 255.255.255.0

      frame-reply interface-dlci 201

      !

      interface serial 0.2 point-to-point

      ip address 172.16.3.1 255.255.255.0

      frame-reply interface-dlci 203

      !

      相關(guān)調(diào)試命令:

      show frame-relay lmi

      show frame-relay map

      show frame-relay pvc

      show frame-relay route

      show interfaces serial

      go top

      4. 幀中繼 Multipoint 配置實(shí)例:

      Router1:

      interface serial 0

      encapsulation frame-reply

      !

      interface serial 0.1 multipoint

      ip address 172.16.1.2 255.255.255.0

      frame-reply map ip 172.16.1.1 201 broadcast

      frame-reply map ip 172.16.1.3 301 broadcast

      frame-reply map ip 172.16.1.4 401 broadcast

      !

      Router2:

      interface serial 0

      encapsulation frame-reply

      !

      interface serial 0.1 multipoint

      ip address 172.16.1.1 255.255.255.0

      frame-reply map ip 172.16.1.2 102 broadcast

      frame-reply map ip 172.16.1.3 102 broadcast

      frame-reply map ip 172.16.1.4 102 broadcast

      !

      五、ISDN

      1. 綜合數(shù)字業(yè)務(wù)網(wǎng)(ISDN)

      綜合數(shù)字業(yè)務(wù)網(wǎng)(ISDN)由數(shù)字電話和數(shù)據(jù)傳輸服務(wù)兩部分組成,一般由電話局提供這種服務(wù)。ISDN的基本速率接口(BRI)服務(wù)提供2個(gè)B信道和1個(gè)D信道(2B+D)。BRI的B信道速率為64Kbps,用于傳輸用戶數(shù)據(jù)。D信道的速率為16Kbps,主要傳輸控制信號(hào)。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)1.544Mbps,其中D信道速率為64Kbps。而在歐洲、澳大利亞等國(guó)家,ISDN的PRI提供30個(gè)B信道和1個(gè)64Kbps D信道,總速率可達(dá)2.048Mbps。我國(guó)電話局所提供ISDN PRI為30B+D。

      2. 基本命令

    任務(wù) 命令
    設(shè)置ISDN交換類(lèi)型 isdn switch-type switch-type1
    接口設(shè)置 interface bri 0
    設(shè)置PPP封裝 encapsulation ppp
    設(shè)置協(xié)議地址與電話號(hào)碼的映射 dialer map protocol next-hop-address[name hostname] [broadcast] [dial-string]
    啟動(dòng)PPP多連接 ppp multilink
    設(shè)置啟動(dòng)另一個(gè)B通道的閾值 dialer load-threshold load
    顯示ISDN有關(guān)信息 show isdn {active | history | memory | services | status [dsl | interface-type number] | timers}
      注:1.交換機(jī)類(lèi)型如下表,國(guó)內(nèi)交換機(jī)一般為basic-net3。
    按區(qū)域分關(guān)鍵字                  交換機(jī)類(lèi)型
    Australia  
    basic-ts013 Australian TS013 switches
    Europe  
    basic-1tr6 German 1TR6 ISDN switches
    basic-nwnet3 Norway NET3 switches (phase 1)
    basic-net3 NET3 ISDN switches (UK, Denmark, and other nations); covers the Euro-ISDN E-DSS1 signalling system
    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實(shí)現(xiàn)DDR(dial-on-demand routing)實(shí)例:

      設(shè)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路由器同時(shí)支持回?fù)芄δ,我們將路由器Router1作為Callback Server,Router2作為Callback Client。

      與回?fù)芟嚓P(guān)命令:

    任務(wù) 命令
    映射協(xié)議地址和電話號(hào)碼,并在接口上使用在全局模式下定義的PPP回?fù)艿挠成漕?lèi)別。 dialer map protocol address namehostname class classname dial-string
    設(shè)置接口支持PPP回?fù)?/td> ppp callback accept
    在全局模式下為PPP回?fù)茉O(shè)置映射類(lèi)別 map-class 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 callback-server [username]
    設(shè)置接口要求PPP回?fù)?/td> ppp callback request 
      設(shè)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)躵outer2的過(guò)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訪問(wèn)首都在線263網(wǎng)實(shí)例:

      本地局部網(wǎng)地址為10.0.0.0/24,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)Internet。263的ISDN電話號(hào)碼為2633,用戶為263,口令為263,所涉及的命令如下表:

    任務(wù) 命令
    指定接口通過(guò)PPP/IPCP地址協(xié)商獲得IP地址 ip address negotiated
    指定內(nèi)部和外部端口 ip nat {inside | outside}
    使用ppp/pap作認(rèn)證 ppp authentication pap callin
    指定接口屬于撥號(hào)組1 dialer-group 1
    定義撥號(hào)組1允許所有IP協(xié)議 dialer-list 1 protocol ip permit
    設(shè)定撥號(hào),號(hào)碼為2633 dialer string 2633 
    設(shè)定登錄263的用戶名和口令 ppp pap sent-username 263 password 263
    設(shè)定默認(rèn)路由 ip route 0.0.0.0 0.0.0.0 bri 0
    設(shè)定符合訪問(wèn)列表2的所有源地址被翻譯為bri 0所擁有的地址 ip nat inside source list 2 interface bri 0 overload
    設(shè)定訪問(wèn)列表2,允許所有協(xié)議 access-list 2 permit any
      具體配置如下:

      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 community public ro

      !

      line console 0

      exec-timeout 0 0

      !

      line vty 0 4

      !

      end

      5. Cisco765M通過(guò)ISDN撥號(hào)上263

      由于Cisco765的設(shè)置命令與我們常用的Cisco路由器的命令不同,所以以下列舉了通過(guò)Cisco765上263訪問(wèn)Internet的具體命令行設(shè)置步驟。

      >set system c765

      c765> set multidestination on

      c765> set switch net3

      c765> set ppp multilink on

      c765> cd lan

      c765:LAN> set ip routing on

      c765:LAN> set ip address 10.0.0.1

      c765:LAN> set ip netmask 255.0.0.0

      c765:LAN> set briding off

      c765:LAN>cd

      c765> set user remotenet

      New user remotenet being created

      c765:remotenet> set ip routing on

      c765:remotenet> set bridging off

      c765:remotenet> set ip framing none

      c765:remotenet> set ppp clientname 263

      c765:remotenet> set ppp password client

      Enter new Password: 263

      Re-Type new Password: 263

      c765:remotenet> set ppp authentication out none

      c765:remotenet> set ip address 0.0.0.0

      c765:remotenet> set ip netmask 0.0.0.0

      c765:remotenet> set ppp address negotiation local on

      c765:remotenet> set ip pat on

      c765:remotenet> set ip route destination 0.0.0.0/0 gateway 0.0.0.0

      c765:remotenet> set number 2633

      c765:remotenet> set active

      命令描述如下:

    任務(wù) 命令
    設(shè)置路由器系統(tǒng)名稱(chēng) 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(lèi)型為NET3 set switch net3
    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。 set user remotenet
    使用PPP/IPCP set ip framing none
    設(shè)置上網(wǎng)用戶帳號(hào) set ppp clientname 263
    設(shè)置上網(wǎng)口令 set ppp password client
    Enter new Password: 263
    Re-Type new Password: 263
    不用PPP/CHAP或PAP做認(rèn)證 set ppp authentication out none
    允許地址磋商 set ppp address negotiation local on
    設(shè)置地址翻譯 set ip pat on
    設(shè)置默認(rèn)路由 set ip route destination 0.0.0.0/0 gateway 0.0.0.0
    設(shè)置ISP的電話號(hào)碼 set number 2633
    激活用戶預(yù)制文件 set active
      六、PSTN

      電話網(wǎng)絡(luò)(PSTN)是目前普及程度最高、成本最低的公用通訊網(wǎng)絡(luò),它在網(wǎng)絡(luò)互連中也有廣泛的應(yīng)用。電話網(wǎng)絡(luò)的應(yīng)用一般可分為兩種類(lèi)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。

      1. 遠(yuǎn)程訪問(wèn)

      1.1.Access Server基本設(shè)置:

      選用Cisco2511作為訪問(wèn)服務(wù)器,采用IP地址池動(dòng)態(tài)分配地址.遠(yuǎn)程工作站使用WIN95撥號(hào)網(wǎng)絡(luò)實(shí)現(xiàn)連接。

      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 | pool-name low-ip-address [high-ip-address]}
    指定地址池的工作方式 ip address-pool [dhcp-proxy-client | local]
      基本接口設(shè)置命令:
    任務(wù) 命令
    設(shè)置封裝形式為PPP encapsulation ppp
    啟動(dòng)異步口的路由功能 async default routing
    設(shè)置異步口的PPP工作方式 async mode {dedicated | interactive}
    設(shè)置用戶的IP地址 peer default ip address {ip-address | dhcp | pool [pool-name]}
    設(shè)置IP地址與Ethernet0相同 ip unnumbered ethernet0
      line撥號(hào)線設(shè)置:
    任務(wù) 命令
    設(shè)置modem的工作方式 modem {inout|dialin}
    自動(dòng)配置modem類(lèi)型 modem autoconfig discovery
    設(shè)置撥號(hào)線的通訊速率 speed speed
    設(shè)置通訊線路的流控方式 flowcontrol {none | software [lock] [in | out] | hardware [in | out]}
    連通后自動(dòng)執(zhí)行命令 autocommand command
      訪問(wèn)服務(wù)器設(shè)置如下:

      Router:

      hostname Router

      enable secret 5 $1$EFqU$tYLJLrynNUKzE4bx6fmH//

      !

      interface Ethernet0

      ip address 10.111.4.20 255.255.255.0

      !

      interface Async1

      ip unnumbered Ethernet0

      encapsulation ppp

      keepalive 10

      async mode interactive

      peer default ip address pool Cisco2511-Group-142

      !

      ip local pool Cisco2511-Group-142 10.111.4.21 10.111.4.36

      !

      line con 0

      exec-timeout 0 0

      password cisco

      !

      line 1 16

      modem InOut

      modem autoconfigure discovery

      flowcontrol hardware

      !

      line aux 0

      transport input all

      line vty 0 4

      password cisco

      !

      end

      相關(guān)調(diào)試命令:

      show interface

      show line

      1.2. Access Server通過(guò)Tacacs服務(wù)器實(shí)現(xiàn)安全認(rèn)證:

      使用一臺(tái)WINDOWS NT服務(wù)器作為T(mén)acacs服務(wù)器,地址為10.111.4.2,運(yùn)行Cisco2511隨機(jī)帶的Easy ACS 1.0軟件實(shí)現(xiàn)用戶認(rèn)證功能.

      相關(guān)設(shè)置:

    任務(wù) 命令
    激活A(yù)AA訪問(wèn)控制 aaa new-model
    用戶登錄時(shí)默認(rèn)起用Tacacs+做AAA認(rèn)證 aaa authentication login default tacacs+
    列表名為no_tacacs使用ENABLE口令做認(rèn)證 aaa authentication login no_tacacs enable
    在運(yùn)行PPP的串行線上采用Tacacs+做認(rèn)證 aaa authentication ppp default tacacs+
    由TACACS+服務(wù)器授權(quán)運(yùn)行EXEC aaa authorization exec tacacs+
    由TACACS+服務(wù)器授權(quán)與網(wǎng)絡(luò)相關(guān)的服務(wù)請(qǐng)求。 aaa authorization network tacacs+
    為EXEC會(huì)話運(yùn)行記帳.進(jìn)程開(kāi)始和結(jié)束時(shí)發(fā)通告給TACACS+服務(wù)器。 aaa accounting exec start-stop tacacs+
    為與網(wǎng)絡(luò)相關(guān)的服務(wù)需求運(yùn)行記帳包括SLIP,PPP,PPP NCPs,ARAP等.在進(jìn)程開(kāi)始和結(jié)束時(shí)發(fā)通告給TACACS+服務(wù)器。 aaa accounting network start-stop tacacs+
    指定Tacacs服務(wù)器地址 tacacs-server host 10.111.4.2
    在Tacacs+服務(wù)器和訪問(wèn)服務(wù)器設(shè)定共享的關(guān)鍵字,訪問(wèn)服務(wù)器和Tacacs+服務(wù)器使用這個(gè)關(guān)鍵字去加密口令和響應(yīng)信息。這里使用tac作為關(guān)鍵字。 tacacs-server key tac
      訪問(wèn)服務(wù)器設(shè)置如下:

      hostname router

      !

      aaa new-model

      aaa authentication login default tacacs+

      aaa authentication login no_tacacs enable

      aaa authentication ppp default tacacs+

      aaa authorization exec tacacs+

      aaa authorization network tacacs+

      aaa accounting exec start-stop tacacs+

      aaa accounting network start-stop tacacs+

      enable secret 5 $1$kN4g$CvS4d2.rJzWntCnn/0hvE0

      !

      interface Ethernet0

      ip address 10.111.4.20 255.255.255.0

      !

      interface Serial0

      no ip address

      shutdown

      interface Serial1

      no ip address

      shutdown

      !

      interface Group-Async1

      ip unnumbered Ethernet0

      encapsulation ppp

      async mode interactive

      peer default ip address pool Cisco2511-Group-142

      no cdp enable

      group-range 1 16

      !

      ip local pool Cisco2511-Group-142 10.111.4.21 10.111.4.36

      tacacs-server host 10.111.4.2

      tacacs-server key tac

      !

      line con 0

      exec-timeout 0 0

      password cisco

      login authentication no_tacacs

      line 1 16

      login authentication tacacs

      modem InOut

      modem autoconfigure type usr_courier

      autocommand ppp

      transport input all

      stopbits 1

      rxspeed 115200

      txspeed 115200

      flowcontrol hardware

      line aux 0

      transport input all

      line vty 0 4

      password cisco

      !

      end

      2. DDR(dial-on-demand routing)實(shí)例

      此例通過(guò)Cisco 2500系列路由器的aux端口實(shí)現(xiàn)異步撥號(hào)DDR連接。Router1撥號(hào)連接到Router2。其中采用PPP/CHAP做安全認(rèn)證,在Router1中應(yīng)建立一個(gè)用戶,以對(duì)端路由器主機(jī)名作為用戶名,即用戶名應(yīng)為Router2。同時(shí)在Router2中應(yīng)建立一個(gè)用戶,以對(duì)端路由器主機(jī)名作為用戶名,即用戶名應(yīng)為Router1。所建的這兩用戶的password必須相同。

      相關(guān)命令如下:

    任務(wù) 命令
    設(shè)置路由器與modem的接口指令 chat-script script-name EXPECT SEND EXPECT SEND (etc.)
    設(shè)置端口在掛斷前的等待時(shí)間 dialer idle-timeout seconds
    設(shè)置協(xié)議地址與電話號(hào)碼的映射 dialer map protocol next-hop-address[name hostname] [broadcast] [modem-script
    modem-regexp] [system-script system-regexp] [dial-string]
     
    設(shè)置電話號(hào)碼 dialer string dial-string
    指定在特定線路下路由器默認(rèn)使用的chat-script script {dialer|reset} script-name
      Router1:

      hostname Router1

      !

      enable secret 5 $1$QKI7$wXjpFqC74vDAyKBUMallw/

      !

      username Router2 password cisco

      chat-script cisco-default "" "AT" TIMEOUT 30 OK "ATDT \T" TIMEOUT 30 CONNECT \c

      !

      interface Ethernet0

      ip address 10.0.0.1 255.255.255.0

      !

      interface Async1

      ip address 192.200.10.1 255.255.255.0

      encapsulation ppp

      async default routing

      async mode dedicated

      dialer in-band

      dialer idle-timeout 60

      dialer map ip 192.200.10.2 name Router2 modem-script cisco-default 573

      dialer-group 1

      ppp authentication chap

      !

      ip route 10.0.1.0 255.255.255.0 192.200.10.2

      dialer-list 1 protocol ip permit

      !

      line con 0

      line aux 0

      modem InOut

      modem autoconfigure discovery

      flowcontrol hardware

      Router2:

      hostname Router2

      !

      enable secret 5 $1$F6EV$5U8puzNt2/o9g.t56PXHo.

      !

      username Router1 password cisco

      !

      interface Ethernet0

      ip address 10.0.1.1 255.255.255.0

      !

      interface Async1

      ip address 192.200.10.2 255.255.255.0

      encapsulation ppp

      async default routing

      async mode dedicated

      dialer in-band

      dialer idle-timeout 60

      dialer map ip 192.200.10.1 name Router1

      dialer-group 1

      ppp authentication chap

      !

      ip route 10.0.0.0 255.255.255.0 192.200.10.1

      dialer-list 1 protocol ip permit

      !

      line con 0

      line aux 0

      modem InOut

      modem autoconfigure discovery

      flowcontrol hardware

      !

      相關(guān)調(diào)試命令:

      debug dialer

      debug ppp authentication

      debug ppp error

      debug ppp negotiation

      debug ppp packet

      show dialer

      3. 異步撥號(hào)備份DDN專(zhuān)線:

      此例主連接采用DDN專(zhuān)線,備份線路為電話撥號(hào)。當(dāng)DDN專(zhuān)線連接正常時(shí),主端口S0狀態(tài)為up,line protocol亦為up,則備份線路狀態(tài)為standby,line protocol為down,此時(shí)所有通信均通過(guò)主接口進(jìn)行。當(dāng)主接口連接發(fā)生故障時(shí),端口狀態(tài)為down,則激活備份接口,完成數(shù)據(jù)通信。此方法不適合為X.25做備份。因?yàn)椋渲梅庋b為X.25的接口只要和X.25交換機(jī)之間的連接正常其接口及l(fā)ine protocol的狀態(tài)亦為 up,它并不考慮其它地方需與之通信的路由器的狀態(tài)如何,所以若本地路由器狀態(tài)正常,而對(duì)方路由器連接即使發(fā)生故障,本地也不會(huì)激活備份線路。例4將會(huì)描述如何為X.25做撥號(hào)備份。

      以下是相關(guān)命令:

    任務(wù) 命令
    指定主線路改變后,次線路狀態(tài)發(fā)生改變的延遲時(shí)間 backup delay {enable-delay | never} {disable-delay | never}
    指定一個(gè)接口作為備份接口 backup interface type number
      hostname c2522rb

      !

      enable secret 5 $1$J5vn$ceYDe2FwPhrZi6qsIIz6g0

      enable password cisco

      !

      username c4700 password 0 cisco

      ip subnet-zero

      chat-script cisco-default "" "AT" TIMEOUT 30 OK "ATDT \T" TIMEOUT 30 CONNECT \c

      chat-script reset atz

      !

      interface Ethernet0

      ip address 16.122.51.254 255.255.255.0

      no ip mroute-cache

      !

      interface Serial0

      backup delay 10 10

      backup interface Serial2

      ip address 16.250.123.18 255.255.255.252

      no ip mroute-cache

      no fair-queue

      !

      interface Serial1

      no ip address

      no ip mroute-cache

      shutdown

      !

      interface Serial2

      physical-layer async

      ip address 16.249.123.18 255.255.255.252

      encapsulation ppp

      async mode dedicated

      dialer in-band

      dialer idle-timeout 60

      dialer map ip 16.249.123.17 name c4700 6825179

      dialer-group 1

      ppp authentication chap

      !

      interface Serial3

      no ip address

      shutdown

      no cdp enable

      !

      interface Serial4

      no ip address

      shutdown

      no cdp enable

      !

      interface Serial5

      no ip address

      no ip mroute-cache

      shutdown

      !

      interface Serial6

      no ip address

      no ip mroute-cache

      shutdown

      !

      interface Serial7

      no ip address

      no ip mroute-cache

      shutdown

      !

      interface Serial8

      no ip address

      no ip mroute-cache

      shutdown

      !

      interface Serial9

      no ip address

      no ip mroute-cache

      shutdown

      !

      interface BRI0

      no ip address

      no ip mroute-cache

      shutdown

      !

      router eigrp 200

      network 16.0.0.0

      !

      ip classless

      !

      dialer-list 1 protocol ip permit

      !

      line con 0

      line 2

      script dialer cisco-default

      script reset reset

      modem InOut

      modem autoconfigure discovery

      rxspeed 38400

      txspeed 38400

      flowcontrol hardware

      line aux 0

      line vty 0 4

      password cisco

      login

      !

      end

      c2522rb#

      4. 異步撥號(hào)備份X.25:

      設(shè)置X.25的撥號(hào)備份,首先X.25連接的端口必須運(yùn)行動(dòng)態(tài)路由協(xié)議,異步撥號(hào)口必須使用靜態(tài)路由.本例選擇EIGRP作為路由選擇協(xié)議,將靜態(tài)路由的Metric的值設(shè)置為200,由于EIGRP的默認(rèn)Metric為90,所以當(dāng)同時(shí)有兩條路徑通往同一網(wǎng)段時(shí),其中Metric值小的路徑生效,而當(dāng)X.25連接出現(xiàn)問(wèn)題時(shí),路由器無(wú)法通過(guò)路由協(xié)議學(xué)習(xí)到路由表,則此時(shí)靜態(tài)路由生效,訪問(wèn)通過(guò)撥號(hào)端口實(shí)現(xiàn)。當(dāng)X.25連接恢復(fù)正常時(shí),路由器又可以學(xué)習(xí)到路由表,則由于 Metric值的不同,靜態(tài)路由自動(dòng)被動(dòng)態(tài)路由所代替,這樣就實(shí)現(xiàn)了備份的功能。

      路由器Router1配置如下:

      hostname router1

      !

      enable secret 5 $1$UTvD$99YiY2XsRMxHudcYeHn.Y.

      enable password cisco

      !

      username router2 password cisco

      ip subnet-zero

      chat-script cisco-default "" "AT" TIMEOUT 30 OK "ATDT \T" TIMEOUT 30 CONNECT \c

      chat-script reset atz

      interface Ethernet0

      ip address 202.96.38.100 255.255.255.0

      !

      interface Serial0

      ip address 202.96.0.1 255.255.255.0

      encapsulation x25

      x25 address 10112227

      x25 htc 16

      x25 map ip 202.96.0.2 10112225 broadcast

      !

      interface Serial1

      no ip address

      shutdown

      !

      !

      interface Async 1

      ip address 202.96.1.1 255.255.255.252

      encapsulation ppp

      dialer in-band

      dialer idle-timeout 60

      dialer map ip 202.96.1.2 name router2 modem-script cisco-default 2113470

      dialer-group 1

      ppp authentication chap

      !

      router eigrp 200

      redistribute connected

      network 202.96.0.0

      !

      ip route 202.96.37.0 255.255.255.0 202.96.1.2 200

      dialer-list 1 protocol ip permit

      line con 0

      line aux 0

      script dialer cisco-default

      script reset reset

      modem InOut

      modem autoconfigure discovery

      transport input all

      rxspeed 38400

      txspeed 38400

      flowcontrol hardware

      line vty 0 4

      password cisco

      login

      !

      end

      路由器Router2配置如下:

      hostname router2

      !

      enable secret 5 $1$T4IU$2cIqak8f/E4Ug6dLT0k.J0

      enable password cisco

      !

      username router1 password cisco

      ip subnet-zero

      chat-script cisco-default "" "AT" TIMEOUT 30 OK "ATDT \T" TIMEOUT 30 CONNECT \c

      chat-script reset atz

      !

      interface Ethernet0

      ip address 202.96.37.100 255.255.255.0

      !

      interface Serial0

      ip address 202.96.0.2 255.255.255.0

      no ip mroute-cache

      encapsulation x25

      x25 address 10112225

      x25 htc 16

      x25 map ip 202.96.0.1 10112227 broadcast

      !

      interface Serial1

      no ip address

      shutdown

      !

      interface Async1

      ip address 202.96.1.2 255.255.255.252

      encapsulation ppp

      keepalive 30

      async default routing

      async mode dedicated

      dialer in-band

      dialer idle-timeout 60

      dialer wait-for-carrier-time 120

      dialer map ip 202.96.1.1 name router1 modem-script cisco-default 2113469

      dialer-group 1

      ppp authentication chap

      !

      router eigrp 200

      redistribute static

      network 202.96.0.0

      !

      no ip classless

      ip route 202.96.38.0 255.255.255.0 202.96.1.1 200

      dialer-list 1 protocol ip permit

      !

      line con 0

      exec-timeout 0 0

      line aux 0

      script reset reset

      modem InOut

      modem autoconfigure discovery

      transport input all

      rxspeed 38400

      txspeed 38400

      flowcontrol hardware

      line vty 0 4

      password cisco

      login

      !

      end

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