網(wǎng)絡(luò)工程師考試路由器方面相關(guān)知識(shí)

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
!
CISCO路由器配置手冊(cè)－第二章（廣域網(wǎng)協(xié)議設(shè)置ISDN）
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
!