ADSL技术37315.ppt

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1、 2006,Shenzhen Polytechnic.All rights reserved.1ADSLADSL技术技术 2006,Shenzhen Polytechnic.All rights reserved.2 DSL（数字用户线路，Digital Subscriber Line）是以铜质电话线为传输介质的传输技术组合，它包括HDSL、SDSL、VDSL、ADSL和RADSL等，一般称之为xDSL。它们主要的区别就是体现在信号传输速度和距离的不同以及上行速率和下行速率对称性的不同这两个方面。What Is a DSL?2006,Shenzhen Polytechnic.All right

2、s reserved.3 VDSL、HDSL、IDSL、SDSL等等DSL技术技术DSL TechnologyMax.Data Rate(Down/Up)bpsMax.Distancefeet/kmADSL8 M/1 M18,000/5.46VDSL52 M/13 M4,500/1.37IDSL144 k/144 k18,000/5.46SDSL768 k/768 k22,000/6.7G.SHDSL2.3 M/2.3 M28,000/8.52Maximum data rate and distance assume no impairments.Maximum data rate is ac

3、hieved at shortest distance.Maximum distance is achieved at lowest data rate.2006,Shenzhen Polytechnic.All rights reserved.4ADSL ADSL 在一对铜线上支持上行速率640Kbps到1Mbps，下行速率1Mbps到8Mbps，有效传输距离在35公里范围以内.在Internet中，浏览Web等客户/服务器业务的下行数据量要大得多，因此适于采用下行高速化的ADSL Modem。2006,Shenzhen Polytechnic.All rights reserved.5AD

4、SLADSL技术技术 不对称数字用户线ADSL作为一种传输层的技术，充分利用现有的铜线资源，在一对双绞线上提供上行640kbps下行8Mbps的带宽，从而克服了传统用户的“瓶颈”，实现了真正意义上的宽带接入。ADSL下行带宽中的一部分可以用于语音，因此，不需要另外的线路就可以打电话。与有线电视线路上提供的类似服务不同，在使用ADSL时，不必与邻居争夺带宽。在许多情况下，凭借现有的电话线路就可以应用ADSL。2006,Shenzhen Polytechnic.All rights reserved.6ADSLADSL技术技术(cont.)cont.)A key feature of ADSL i

5、s coexistence with POTS.Transmission of voice and data signals is performed on the same wire pair.Data circuits are offloaded from the voice switch.Splitter versus microfilter POTS splitter at CO&Microfilters at customer premises 2006,Shenzhen Polytechnic.All rights reserved.8几种几种ADSL MODEMADSL MODE

6、M接入示意图接入示意图 以太网接口外置式以太网接口外置式ADSL MODEM ADSL MODEM 接入示意图接入示意图 2006,Shenzhen Polytechnic.All rights reserved.9几种几种ADSL MODEMADSL MODEM接入示意图接入示意图(cont.)cont.)USB接口外置式ADSL MODEM接入示意图 2006,Shenzhen Polytechnic.All rights reserved.10几种几种ADSL MODEMADSL MODEM接入示意图接入示意图(cont.)cont.)PCI接口内置式ADSL MODEM接入示意图 20

7、06,Shenzhen Polytechnic.All rights reserved.11ADSL Channels and EncodingSingle-carrier modulation technique CAP Modulation 2006,Shenzhen Polytechnic.All rights reserved.12Multiple-carrier modulation techniqueDMT ModulationADSL Channels and Encoding(cont.)2006,Shenzhen Polytechnic.All rights reserved

8、.13 Data over ADSL:PPPoE 2006,Shenzhen Polytechnic.All rights reserved.14Data over ADSL:PPPoE(cont.)2006,Shenzhen Polytechnic.All rights reserved.15Data over ADSL:PPPoE(cont.)2006,Shenzhen Polytechnic.All rights reserved.16Data over ADSL:PPPoE(cont.)Ethernet frame carrying PPP frameService provider

9、end:DSLAM for DSL connection terminationAggregation router for PPP session terminationSubscriber end:DSL modem for DSL connection terminationPPPoE client for PPP session terminationThe client device is the PC or the router at the CPE 2006,Shenzhen Polytechnic.All rights reserved.17Data over ADSL:PPP

10、oE(cont.)IP is assigned to PPPoE client functioning device.A CPE router can connect multiple users via a single ADSL connection using NAT/PAT and DHCP.2006,Shenzhen Polytechnic.All rights reserved.18Configuration of a Cisco Router as the PPPoE Client1.Configure an Ethernet interface2.Configure a dia

11、ler interface3.Configure PAT4.Configure DHCP server5.Configure a static default route 2006,Shenzhen Polytechnic.All rights reserved.19Example:CPE as the PPPoE Clientover the Ethernet Interface 2006,Shenzhen Polytechnic.All rights reserved.20Example:CPE as the PPPoE Clientover the Ethernet Interface

12、(cont.)2006,Shenzhen Polytechnic.All rights reserved.21知识扩充知识扩充 2006,Shenzhen Polytechnic.All rights reserved.22Configuration of a PPPoE Client 2006,Shenzhen Polytechnic.All rights reserved.23PPPoE Client ConfigurationConfigures the Ethernet interfaceinterface ethernet numberrouter(config)#pppoe ena

13、blerouter(config-if)#pppoe-client dial-pool-number numberrouter(config-if)#Enables PPPoE on Ethernet interfaceBinds a dialer profile to the Ethernet interface 2006,Shenzhen Polytechnic.All rights reserved.24Example:Configuring PPPoE Client 2006,Shenzhen Polytechnic.All rights reserved.25Configuratio

14、n of the PPPoE DSL Dialer Interface 2006,Shenzhen Polytechnic.All rights reserved.26Configuring the PPPoE Dialer InterfaceConfigures the dialer interface.interface dialer numberrouter(config)#encapsulation ppprouter(config-if)#ip address negotiatedrouter(config-if)#Specifies PPP encapsulation for th

15、e dialer interface.Sets IP address to be negotiated with the remote peer using IPCP.2006,Shenzhen Polytechnic.All rights reserved.27Configuring the PPPoEDialer Interface(Cont.)Binds dialer interface to the dialer pooldialer pool pool_numberrouter(config-if)#ip mtu mtu_sizerouter(config-if)#ppp authe

16、ntication chap callinrouter(config-if)#Reduces the maximum Ethernet payload size because the PPPoE header requires 8 bytes(Optional)Configures PPP authentication CHAP 2006,Shenzhen Polytechnic.All rights reserved.28Example:Configuring thePPPoE Dialer Interface 2006,Shenzhen Polytechnic.All rights re

17、served.29Configuration of PAT 2006,Shenzhen Polytechnic.All rights reserved.30Port Address Translation 2006,Shenzhen Polytechnic.All rights reserved.31Configure PATSpecifies the addresses that may be translatedaccess-list ACL_num permit|deny protocol source_network source_wildcard destination_networ

18、k destination_wildcardrouter(config)#ip nat inside source list ACL_num interface interface number overloadrouter(config)#ip nat inside|outsiderouter(config-if)#Enables dynamic translation of addresses using the assigned IP address of the interfaceSpecifies the interface as inside or outside related

19、to PAT 2006,Shenzhen Polytechnic.All rights reserved.32Example:PAT Configuration 2006,Shenzhen Polytechnic.All rights reserved.33Configuration of DHCP to Scale DSL 2006,Shenzhen Polytechnic.All rights reserved.34Configure a DHCP ServerEnables a DHCP pool for use by hosts and enters DHCP pool configu

20、ration mode.ip dhcp pool pool_namerouter(config)#import allrouter(dhcp-config)#network network_address subnet_maskrouter(dhcp-config)#Imports DNS and WINS information from IPCP.Specifies the network and subnet mask of the pool.default-router addressrouter(dhcp-config)#Specifies the default router fo

21、r the pool to use.2006,Shenzhen Polytechnic.All rights reserved.35Example:DHCP Server Configuration 2006,Shenzhen Polytechnic.All rights reserved.36Configuration of a Static Default Route 2006,Shenzhen Polytechnic.All rights reserved.37Configuring a Static Default RouteThe CPE can use a static defau

22、lt route to reach all remote destinations.ip route 0.0.0.0 0.0.0.0 interface numberrouter(config)#2006,Shenzhen Polytechnic.All rights reserved.38Example:Static Default Route 2006,Shenzhen Polytechnic.All rights reserved.39Verifying a PPPoE Configuration 2006,Shenzhen Polytechnic.All rights reserved

23、.40Verifying a PPPoE ConfigurationDisplays PPPoE protocol messages about events that are part of normal session establishment or shutdowndebug pppoe eventsrouter#debug ppp authenticationrouter#show pppoe sessionrouter#Displays authentication protocol messages,including CHAP and PAP packet exchangesD

24、isplays basic information about currently active PPPoE sessions 2006,Shenzhen Polytechnic.All rights reserved.41Verifying a PPPoE Configuration(Cont.)Displays address bindings on the Cisco IOS DHCP servershow ip dhcp bindingrouter#show ip nat translationsrouter#ipconfig/allC:Documents and SettingsUs

25、erDisplays active NAT translationsDisplays the complete IP configuration on Windows NT,2000,or XP system 2006,Shenzhen Polytechnic.All rights reserved.42CPE#show pppoe sessionTotal PPPoE sessions 1PPPoE Session InformationUID SID RemMAC Intf Intf Session LocMAC VASt state0 5989 0090.1a41.1a83 Et1 Vi

26、2 N/A 000b.46e2.eb36 UPDebug VPDN PPPoE EventsCPE#debug pppoe events15:13:41.991:Sending PADI:Interface=Ethernet115:13:42.083:PPPoE 0:I PADO15:13:44.091:PPPOE:weve got our pado and the pado timer went off15:13:44.091:OUT PADR from PPPoE Session15:13:44.187:PPPoE 5989:I PADS15:13:44.187:IN PADS from

27、PPPoE SessionDetermine if the PPPoE connect phase is successful.Get the status of the PPPoE session.2006,Shenzhen Polytechnic.All rights reserved.43Debug PPP AuthenticationEnable debugging for PPP authentication to verify authentication success.CPE#debug ppp authenticationCPE#configure terminalEnter

28、 configuration commands,one per line.End with CNTL/Z.CPE(config)#interface ATM 0/0CPE(config-if)#no shutdown00:19:05:%LINK-3-UPDOWN:Interface ATM 0/0,changed state to up00:19:06:%LINEPROTO-5-UPDOWN:Line protocol on Interface ATM0/0,changed state to up00:19:29:%DIALER-6-BIND:Interface Vi2 bound to pr

29、ofile Di100:19:29:Vi2 PPP:Using dialer call direction00:19:29:Vi2 PPP:Treating connection as a callout00:19:29:Vi2 PPP:Authorization required00:19:29:Vi2 PPP:No remote authentication for call-out00:19:29:%LINK-3-UPDOWN:Interface Virtual-Access2,changed state to up00:19:31:Vi2 CHAP:I CHALLENGE id 1 l

30、en 24 from ISP00:19:31:Vi2 CHAP:Using hostname from interface CHAP00:19:31:Vi2 CHAP:Using password from AAA00:19:31:Vi2 CHAP:O RESPONSE id 1 len 25 from CPE00:19:32:Vi2 CHAP:I SUCCESS id 1 len 400:19:33:%LINEPROTO-5-UPDOWN:Line protocol on Interface Virtual-Access2,changed state to up 2006,Shenzhen

31、Polytechnic.All rights reserved.44Verify DHCP ClientsC:Documents and SettingsUseripconfig/allWindows 2000 IP ConfigurationEthernet adapter LAB:Connection-specific DNS Suffix .: Description.:Intel(R)PRO/1000 MT Mobile Connection Physical Address.:00-11-25-AF-40-9B Dhcp Enabled.:Yes Autoconfiguration

32、Enabled.:Yes IP Address.:10.0.0.2 Subnet Mask.:255.0.0.0 Default Gateway.:10.0.0.1 DHCP Server.:10.0.0.1 DNS Servers.:192.168.1.1 192.168.1.2 Primary WINS Server.:192.168.1.3 Lease Obtained.:6.April 2006 16:36:31 Lease Expires.:7.April 2006 0:36:31Verify how the IP address is assigned on the PC.2006

33、,Shenzhen Polytechnic.All rights reserved.45Verify DHCP ServerCPE#show ip dhcp bindingIP address Client-ID/Lease expiration Type Hardware address10.0.0.2 0100.5056.4000.59 Jan 21 2006 12:50 AM Automatic10.0.0.3 0100.5056.4000.60 Jan 21 2006 12:50 AM AutomaticVerify the existing DHCP bindings on the

34、router(DHCP server).2006,Shenzhen Polytechnic.All rights reserved.46Verify how IP addresses are translated on the router.CPE#show ip nat translationsPro Inside global Inside local Outside local Outside globalicmp 192.168.1.202:512 10.0.0.2:512 192.168.123.100:512 192.168.123.100:512Verify PAT 2006,S

35、henzhen Polytechnic.All rights reserved.47PPPoE Sample Configurationhostname CPE!ip dhcp pool MyPool network 10.0.0.0 255.0.0.0 default-router 10.0.0.1!interface Ethernet0/1 no ip address pppoe enable pppoe-client dial-pool-number 1!interface Ethernet0/0 ip address 10.0.0.1 255.0.0.0 ip nat inside!interface Dialer0 ip address negotiated encapsulation ppp dialer pool 1 ip mtu 1492 ip nat outside ppp authentication chap callin ppp chap password mysecret!ip nat inside source list 101 interface Dialer0 overloadaccess-list 101 permit ip 10.0.0.0 0.255.255.255 any!ip route 0.0.0.0 0.0.0.0 Dialer0