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1、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B信道和1個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。在北美和日本,ISDN的主速率接口(PRI)提供23個B信道和1個D信道,總速率可達1.544Mbps,其中D信道速率為64Kbps。而在歐洲、澳大利亞等國家,ISDN的PRI提供30個B信道和1個64KbpsD信道,總速率可達2.048Mbps。我國電話局所提供ISDNPRI為3
2、0B+D。2.??????基本命令任務(wù)命令設(shè)置ISDN交換類型isdnswitch-typeswitch-type1接口設(shè)置interfacebri0設(shè)置PPP封裝encapsulationppp設(shè)置協(xié)議地址與電話號碼的映射dialermapprotocolnext-hop-address[namehostname][broadcast][dial-string]啟動PPP多連接pppmultilink設(shè)置啟動另一個B通道的閾值dialerload-thresholdload顯示ISDN有關(guān)信息showisdn{active
3、history
4、memory
5、services
6、status[dsl
7、
8、interface-typenumber]
9、timers}注:1.交換機類型如下表,國內(nèi)交換機一般為basic-net3。按區(qū)域分關(guān)鍵字交換機類型Australia?basic-ts013AustralianTS013switchesEurope?basic-1tr6German1TR6ISDNswitchesbasic-nwnet3NorwayNET3switches(phase1)basic-net3NET3ISDNswitches(UK,Denmark,andothernations);coverstheEuro-ISDNE-DSS1signallingsystemprimary-ne
10、t5NET5switches(UKandEurope)vn2FrenchVN2ISDNswitchesvn3FrenchVN3ISDNswitchesJapan?nttJapaneseNTTISDNswitchesprimary-nttJapaneseISDNPRIswitchesNorthAmerica?basic-5essAT&Tbasicrateswitchesbasic-dms100NTDMS-100basicrateswitchesbasic-ni1NationalISDN-1switchesprimary-4essAT&T4ESSswitchtypefortheU.S.(ISDNP
11、RIonly)primary-5essAT&T5ESSswitchtypefortheU.S.(ISDNPRIonly)primary-dms100NTDMS-100switchtypefortheU.S.(ISDNPRIonly)NewZealand?basic-nznet3NewZealandNet3switches3.??????ISDN實現(xiàn)DDR(dial-on-demandrouting)實例:設(shè)置如下:Router1:hostnamerouter1userrouter2passwordcisco!isdnswitch-typebasic-net3!interfacebri0ipad
12、dress192.200.10.1255.255.255.0encapsulationpppdialermapip192.200.10.2namerouter2572dialerload-threshold80pppmultilinkdialer-group1pppauthenticationchap!dialer-list1protocolippermit!?Router2:hostnamerouter2userrouter1passwordcisco!isdnswitch-typebasic-net3!interfacebri0ipaddress192.200.10.2255.255.25
13、5.0encapsulationpppdialermapip192.200.10.1namerouter1571dialerload-threshold80pppmultilinkdialer-group1pppauthenticationchap!dialer-list1protocolippermit!Cisco路由器同時支持回撥功能,我們將路由器Router1作為CallbackServer