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1、 Cisco Cisco Cisco Cisco城域接入网络解决方案城域接入网络解决方案城域接入网络解决方案城域接入网络解决方案-ADSLADSLADSLADSL2IP MAN Solution,Draft 1,April 13,2001议程议程思科思科DSLDSL解决方案概述解决方案概述Cisco 6260 IP DSL Cisco 6260 IP DSL 交换机交换机Cisco DSL Cisco DSL 宽带服务器宽带服务器Cisco DSLCisco DSL网络管理网络管理3IP MAN Solution,Draft 1,April 13,20014IP MAN Solution,Dr
2、aft 1,April 13,20015IP MAN Solution,Draft 1,April 13,2001ADSL Functional SegmentsADSL Functional SegmentsADSL Functional SegmentsADSL Functional SegmentsCPECustomer Premise EquipmentNAPNetwork Access ProviderNSPNetwork Service ProviderCPENAPNSPVideoVoiceContentATU-RDSLAMAggregationService SelectionC
3、oreTerminationService SelectionEnterpriseInternetISPInternet6IP MAN Solution,Draft 1,April 13,20017IP MAN Solution,Draft 1,April 13,2001Cisco Cisco GlobalGlobalDSLDSL-新一代业务的基础新一代业务的基础企业企业PSTNIP+ATMMPLS家庭办公室、个家庭办公室、个人用户人用户主要的分主要的分支机构支机构中小企业中小企业家庭用户家庭用户IntelCisco 600/700/800/1000本地话音业务本地话音业务可网管的话音可网管的
4、话音 和数据和数据 VPNs专线的替代专线的替代视频会议视频会议VoDInternet高带宽高带宽高带宽高带宽=多业务多业务多业务多业务=高利润高利润高利润高利润Cisco 800 1700ISP6400/7400Cisco60006400/740062606015Cisco6260Cisco 2600/3600MDU8IP MAN Solution,Draft 1,April 13,2001议程议程思科思科DSLDSL解决方案概述解决方案概述Cisco 6260 IP DSL Cisco 6260 IP DSL 交换机交换机Cisco DSL Cisco DSL 宽带服务器宽带服务器Cisc
5、o DSLCisco DSL网络管理网络管理9IP MAN Solution,Draft 1,April 13,2001DSL DSL 发展历程发展历程“IP DSL Switch”2000Integrated IP Router and ATM switchDelivers IP+ATM service for managed IP services,VoIP/VoATM,and consumer entertainmentPre-1998Pre-1998DumbDumb DSLAM DSLAMUBR or frame only multiplexerBasic Internet acces
6、sBarrier to multi-service SmartDSLAM 1999Integrated ATM switchenables traffic prioritizationNot aware of IP applications10IP MAN Solution,Draft 1,April 13,2001什么是什么是“IP DSL Switch”?IP DSL Switch”?将将 ATM ATM 交换机和交换机和IP IP 路由器集成在一起路由器集成在一起 可网管的可网管的 DSL DSL 服务的基础,支持多种服务的基础,支持多种IPIP业务业务MPLS MPLS 和和IPSec
7、 VPNIPSec VPNDSL DSL 线路的汇聚线路的汇聚 WebCache Aware-WebCache Aware-节省广域网带宽节省广域网带宽视频娱乐的组播视频娱乐的组播防火墙提供更强的安全性防火墙提供更强的安全性支持多种支持多种DSL DSL 多种中继接口多种中继接口运营商级设计运营商级设计11IP MAN Solution,Draft 1,April 13,2001More IP rich services can be enabled in the future IP Multicast will allow replication at the edge thus elimi
8、nating wasted bandwidth Web caching at the Switch can reduce internet traffic trunk SP can target MXU applications with services like Video on Demand,Web hosting,File backups“Cherry-pick”the IP services based on hardware potential12IP MAN Solution,Draft 1,April 13,2001 传统传统 DSLAM DSLAM 应用应用Enterpris
9、eInternetISPPVCATU-RDSLAMCorePVCPVCPVCOne PVC per subscriberAggregated PVC VC depletion on the SP access side VC provisioning delays VC limitation could restrict number of subscribers13IP MAN Solution,Draft 1,April 13,2001 IP DSL Switch-Aggregatioat at the Edge IP DSL Switch-Aggregatioat at the Edge
10、 ATU-R IP DSLSWITCHMPLS VPNor IP CorePVCAggregated PVCISP orCorporate VC aggregation at the IP DSL Switch Switch acts as a PE for MPLS core to enable VPN services Reduces provisioning delays14IP MAN Solution,Draft 1,April 13,2001Cisco 6000 IP DSL SwitchCisco 6000 IP DSL SwitchCisco GlobalCisco Globa
11、lDSLDSL的基础的基础DSLDSL铜线网络铜线网络铜线网络铜线网络IP+ATM核心核心 SVC/SoftPVCSVC/SoftPVC Fair SubtendingFair SubtendingATM SwitchATM Switch PVC PVC CBRCBRUBRUBRVBRVBRSmartSmartDSLAMDSLAMPriority QueuesPriority Queuesnx E1/T1,DS3,E3,OC3,OC12nx E1/T1,DS3,E3,OC3,OC12ADSL G.shdsl,SDSL,IDSLADSL G.shdsl,SDSL,IDSLUBR or Frame
12、UBR or FrameDumbDumbDSLAMDSLAM.提供提供提供提供提供提供IPIPIP和和和和和和/或或或或或或ATMATMATM的灵活性和扩展性的灵活性和扩展性的灵活性和扩展性的灵活性和扩展性的灵活性和扩展性的灵活性和扩展性IP MulticastIP MulticastWebCacheWebCache Aware AwareIP QoSIP QoSIP RoutingIP RoutingMPLSMPLSPPPoE/A,1483PPPoE/A,1483VC TerminationVC Termination运营商级的设计运营商级的设计15IP MAN Solution,Draft
13、 1,April 13,2001Cisco 6000 IP DSL Switch Cisco 6000 IP DSL Switch 产品产品市场市场市场市场Cisco 6015Cisco 6015N.A.CO,MDU,DLCN.A.CO,MDU,DLCCisco 6260Cisco 6260W.W.CO,N.A.MDUW.W.CO,N.A.MDU认证认证认证认证ETSI and NEBSETSI and NEBSETSIETSI 密度密度密度密度24 24 to 48 to 48 线线线线120 120 to 240 to 240 线线线线应用应用应用应用 Internet Internet
14、访问访问访问访问 商务商务商务商务 话音话音话音话音/数据集成数据集成数据集成数据集成IOS,ATM,DSL(ADSL,SDSL,G.shdsl)IOS,ATM,DSL(ADSL,SDSL,G.shdsl)和网管和网管和网管和网管投资保护投资保护投资保护投资保护产品产品产品产品N.A.CON.A.CONEBSNEBS128 128 to 256 to 256 线线线线 Internet Internet 访问访问访问访问 商务商务商务商务 话音话音话音话音/数据集成数据集成数据集成数据集成Cisco 6100Cisco 6100 Internet Internet 访问访问访问访问 商务商务商
15、务商务 话音话音话音话音/数据集成数据集成数据集成数据集成16IP MAN Solution,Draft 1,April 13,2001Cisco 6260 Cisco 6260 机箱机箱面向国际面向国际 PTTs,CLECs,MDUsPTTs,CLECs,MDUs120-240 120-240 用户线路用户线路可扩展的、高性能的可扩展的、高性能的ATM ATM 结构结构1 1 STM-1/OC3,E3,8xE1STM-1/OC3,E3,8xE1上联端口上联端口支持支持CoS/QoSCoS/QoS基于公平机制的级连最多可连接基于公平机制的级连最多可连接1313个个DSLAM,DSLAM,共共3
16、,1203,120个用户线路个用户线路支持支持ATM ATM 信令信令(PVC,SVC,SPVC,VP Tunnel)PVC,SVC,SPVC,VP Tunnel)基于基于IOSIOS的软件的软件 运营商级设计运营商级设计 and and 兼容所有的兼容所有的 ETSI ETSI 标准标准ADSL(CAP and DMT),G.lite,SDSL,ADSL(CAP and DMT),G.lite,SDSL,G.SHDSLG.SHDSL and Cisco DSL Manager and Cisco DSL Manager17IP MAN Solution,Draft 1,April 13,20
17、01Cisco 6260 Cisco 6260 机箱机箱30 30 xTUC xTUC 槽位槽位四口模块密度四口模块密度=120 =120 端口端口八口模块密度八口模块密度=240=240端口端口两个网络接口模块槽位两个网络接口模块槽位主用主用/备用备用13.5 13.5 RURU23.5 in.23.5 in.高,高,19 19 in.in.宽宽11 11 in.in.深深兼容兼容NEBSNEBS标准标准集成电源模块和风扇系统集成电源模块和风扇系统支持支持1+1 1+1 和和 N+1N+1冗余备份冗余备份AC/DC AC/DC 电源电源18IP MAN Solution,Draft 1,Ap
18、ril 13,2001OC3/OC12,E3,E1WAN interfacePort 1Port 1Port nPort n155 155 MbpsMbpsSTUCSTUCCard 2Card 2ATUCATUCCardCard 1 1STUCSTUCCard 3Card 3xTUCxTUCCard nCard nIP DSL SwitchIP DSL SwitchMultirate DSLMultirate DSLADSL/SDSL/G.shdsl/IDSLADSL/SDSL/G.shdsl/IDSL*Available 1HCY00660 660 Mbps Cell Switch Fabr
19、icMbps Cell Switch Fabric1 M+Cell Buffer1 M+Cell BufferCisco 6000 IP DSL Cisco 6000 IP DSL 交换机体系结构交换机体系结构Subtend IFStandard(UBR)Standard(UBR)Economy(VBR-nrtEconomy(VBR-nrt)Medium(VBR-rtMedium(VBR-rt)Premium(CBR)Premium(CBR)IP Services MPLS“Subscriber Management”19IP MAN Solution,Draft 1,April 13,200
20、14 4x ADSL x ADSL 线路模块线路模块支持支持 6015,6160,6260 6015,6160,6260支持线路编码支持线路编码:ANSI T1.413 Issue 2ANSI T1.413 Issue 2ITU G.992.1(G.dmt),G.992.2(G.lite),G.994.1(G.hs)ITU G.992.1(G.dmt),G.992.2(G.lite),G.994.1(G.hs)动态协商动态协商 ITU or ANSI ITU or ANSI 连接连接 机箱密度机箱密度:6015-6015-2424 用户线路用户线路6160-6160-128128用户线路用户线
21、路6260-6260-120120用户线路用户线路20IP MAN Solution,Draft 1,April 13,20018 8x ADSL x ADSL 线路模块线路模块支持支持 6015,6160,6260 6015,6160,6260支持线路编码支持线路编码:ANSI T1.413 Issue 2ANSI T1.413 Issue 2ITU G.992.1(G.dmt),G.992.2(G.lite),G.994.1(G.hs)ITU G.992.1(G.dmt),G.992.2(G.lite),G.994.1(G.hs)动态协商动态协商 ITU or ANSI ITU or AN
22、SI 连接连接 机箱密度机箱密度:6015-48 6015-48 用户线路用户线路6160-2566160-256用户线路用户线路6260-2406260-240用户线路用户线路21IP MAN Solution,Draft 1,April 13,20018 8x SDSL/G.SHDSL x SDSL/G.SHDSL 线路模块线路模块支持支持 6015,6160,6260 6015,6160,62602 2B1Q&TC-PAM B1Q&TC-PAM 支持多速率,最高可到双向支持多速率,最高可到双向2.3 2.3 MbpsMbpsATM ATM 帧结构帧结构机箱密度机箱密度:6015-4860
23、15-48用户线路用户线路6160-2566160-256用户线路用户线路6260-2406260-240用户线路用户线路22IP MAN Solution,Draft 1,April 13,2001NI-2 NI-2 电信级可靠性电信级可靠性 PHY LayerSignals(backplane)Primary NTRPrimary SMBPrimaryDSBPrimary NI-2Primary NI-2Phy IFPhy IFRef.TimingRef.TimingSwitchSwitchIOS Proc.IOS Proc.System FailureSystem FailureSeco
24、ndary NTRSecondary SMB2nd DSBxTU-C#1xTU-C#1xTU-C#2xTU-C#2xTU-C#3xTU-C#3xTU-C#30 xTU-C#30DSB=Digital Serial BusSMB=Serial Management Bus NTR=Network Timing ReferenceSecondary NI-2Secondary NI-223IP MAN Solution,Draft 1,April 13,2001NI-2 STM1 NI-2 STM1 冗余备份冗余备份APS APS 冷备份可在冷备份可在 STM1/STM1 STM1/STM1(中继
25、和集连端口中继和集连端口),),E3/2xE3E3/2xE3上上实现实现每块每块 NINI的端口均连接物理线路的端口均连接物理线路可保护集连机箱和独立机箱可保护集连机箱和独立机箱1+1 1+1 保护保护System FailurePrimarySecondarySecondaryCard FailureFiber FailureData pathPhysical links/fiber6400640024IP MAN Solution,Draft 1,April 13,2001NI-2 E3 NI-2 E3 冗余备份冗余备份1+1 1+1 保护保护APS APS 冷备份可在冷备份可在 E3/2
26、xE3E3/2xE3上实现上实现接口板上的物理链路接口板上的物理链路可保护集连机箱和独立机箱可保护集连机箱和独立机箱System FailureSecondarySecondaryCard FailurePrevious linkActive linksI/O BoardSecondary640025IP MAN Solution,Draft 1,April 13,2001NI-2 nxE1(IMA)NI-2 nxE1(IMA)冗余特点冗余特点Unidirectional,non-revertive,1+1 IMA implementationUnidirectional,non-revert
27、ive,1+1 IMA implementationCold Redundancy is provided on E3/nxE1 and E1/nxE1 Cold Redundancy is provided on E3/nxE1 and E1/nxE1(trunk only)(trunk only)Physical link connections on I/O BoardPhysical link connections on I/O BoardProvided for both subtended and single nodesProvided for both subtended a
28、nd single nodesSystem FailureSecondaryCard FailurePrevious linkActive linksI/O BoardSecondary640026IP MAN Solution,Draft 1,April 13,2001DS3 or E3OC-3/STM-1nxT1/E1使多个使多个 IP DSL IP DSL 交换机共享同一上连链路交换机共享同一上连链路Cisco Cisco 支持两种集连方式支持两种集连方式菊花链菊花链树状结构树状结构CiscoCisco在整个集连体系中保证了对上连链路的公在整个集连体系中保证了对上连链路的公平使用平使用集
29、连概念集连概念-SubtendingSubtending27IP MAN Solution,Draft 1,April 13,2001集连概述集连概述支持最多在每一条支持最多在每一条ATMATM上连链路上集连上连链路上集连1313个节点个节点一个一个WAN DSLAM WAN DSLAM 加加 12 12 个集连个集连 DSLAMsDSLAMsNINI模块上最多有两个集连端口模块上最多有两个集连端口集连配置选项集连配置选项:STM-1(OC-3)/STM-1(OC-3)STM-1(OC-3)/STM-1(OC-3)E3(DS3)/E3(2xDS3)E3(DS3)/E3(2xDS3)DS3/8x
30、T1(E1)(IMA)DS3/8xT1(E1)(IMA)流量的公平机制和流量的公平机制和 QoSQoS 28IP MAN Solution,Draft 1,April 13,2001级连结构级连结构-树型树型Tree TopologyTree Topology Two E3/DS3 subtended ports per shelf Two E3/DS3 subtended ports per shelf One E3/DS3 WAN port at main shelf One E3/DS3 WAN port at main shelf Up to 12 total subtended sh
31、elves Up to 12 total subtended shelves6260DSLAM6260DSLAM6260DSLAM6260DSLAM6260DSLAM6260DSLAM6260DSLAMDS3/E3 WANCentral LocationRemote or LocalE3/DS3 Subtend Interconnectbetween allDSLAMs29IP MAN Solution,Draft 1,April 13,2001级连结构级连结构-菊花链菊花链Daisy Chain ConfigurationDaisy Chain Configuration One OC3/S
32、TM1 subtend port per shelf One OC3/STM1 subtend port per shelf One STM-1/OC-3 WAN on base shelf One STM-1/OC-3 WAN on base shelf Up to 12 subtended shelves Up to 12 subtended shelves6260DSLAM6260DSLAM6260DSLAM6260DSLAM6260DSLAM6260DSLAM6260DSLAMSTM1/OC3WANCentral LocationRemote or LocalSTM1/OC3 Inte
33、rconnectbetween allDSLAMs30IP MAN Solution,Draft 1,April 13,20016260DSLAM6260DSLAM6260DSLAM6260DSLAM6260DSLAM6260DSLAMN x E1/T1WANCentral LocationRemote or Localn x E1/T1 Interconnect between all DSLAMsStar Configuration(n=1:8)Star Configuration(n=1:8)One nxE1/T1 IMA subtend interface per shelf One
34、nxE1/T1 IMA subtend interface per shelf One E3/DS3 or nxE1/T1 on main shelf One E3/DS3 or nxE1/T1 on main shelf Max of 8 T1/12 E1 interfaces on main shelf Max of 8 T1/12 E1 interfaces on main shelf级连结构级连结构-NxE1NxE131IP MAN Solution,Draft 1,April 13,2001Subtending FairnessSubtending Fairness1/4 Upstr
35、eam BW1/16 Upstream BW1/8 Upstream BWShelf No.4Shelf No.3Shelf No.2Shelf No.1Parking-lot problem1/2 Upstream BW1/4 Upstream BW1/8 Upstream BW1/16 Upstream BWCisco NI-2 SolutionExample Using One QoSQ by Shelf SchedulerLocal TrafficShelf No.1Shelf No.4Shelf No.3Each Shelf Gets Fair Upstream BWSchedule
36、r Sends One Cell from Each Nonempty QueueBased on PrioritySchedulerShelf No.2Local TrafficLocal Traffic SchedulerLocal TrafficQ by Shelf32IP MAN Solution,Draft 1,April 13,2001Subtend ArchitecturesSubtend ArchitecturesService Selection GatewayPSTNVVoice GatewayNetwork Management and ProvisioningPacke
37、t BackboneATM BackboneLECISPEnterpriseInternetAggregationAggregationDS3,E3,or OC-3(w/DS3)DS3 or E3OC-3/STM-1OC-3/STM-1nxT1/E1nxT1/E1 or DS3Up to 4 IMA groups pernxT1/E1 interface(trunk or subtend)33IP MAN Solution,Draft 1,April 13,2001NI-2 NI-2 功能总结功能总结支持扩展支持扩展ATMATM服务的服务的ATMATM交换矩阵交换矩阵支持多种广域网端口支持多种
38、广域网端口集连集连 3,120 3,120 端口端口/系统系统 (DSL DSL 业务业务)基于基于支持冗余备份支持冗余备份Console/CiscoConsole/CiscoIOS IOS 软件和软件和 SNMPSNMP以太以太网带外网管端口网带外网管端口支持支持SNMP agent/MIB SNMP agent/MIB 系统时钟和冗余控制系统时钟和冗余控制告警中继接口告警中继接口IP IP 交换交换 and MPLSand MPLS34IP MAN Solution,Draft 1,April 13,2001Cisco IOS Cisco IOS 软件概述软件概述基于基于 LightStr
39、eamLightStream 1010 1010 软件软件 扩展版本并在部分功能上有所增强扩展版本并在部分功能上有所增强增强的增强的 ATM QoS ATM QoS 和和 SVC SVC 支持支持(UBR,ABR,VBR-nrt,VBR-rt,CBR)UBR,ABR,VBR-nrt,VBR-rt,CBR)增加增加 DSL DSL 的调制解调功能的调制解调功能支持所有的支持所有的 ATM ATM 业务业务ATM QoS ATM QoS 和流量管理和流量管理PVCs,SVCs,soft PVCs PVCs,SVCs,soft PVCs ILMI and OAM ILMI and OAM 信元信元M
40、PLS VPNMPLS VPNCLI CLI 和和 SNMP SNMP 网管网管35IP MAN Solution,Draft 1,April 13,2001ATM ATM 交换交换高性能的高性能的 ATM ATM 交换矩阵交换矩阵 1 1M+M+信元共享内存信元共享内存 三条交换端口组三条交换端口组,每条每条 165 165 MbpsMbps 本地端口和集连端口本地端口和集连端口 WAN WAN 中继端口中继端口 SAR SAR 处理器端口处理器端口660-660-Mbps Mbps 交换能力交换能力12.812.8微秒延迟微秒延迟 36IP MAN Solution,Draft 1,Apr
41、il 13,2001ATM Traffic ClassesATM Traffic Classes四个优先队列四个优先队列 CoS/QoSCoS/QoSCBR CBR 速率限制业务,需要保证带宽和时延速率限制业务,需要保证带宽和时延VBR-rt VBR-rt 时延敏感的话音和视频业务时延敏感的话音和视频业务VBR-nrt VBR-nrt 高优先级的数据业务高优先级的数据业务UBR UBR 低优先级的数据业务低优先级的数据业务EFCI(ABR)EFCI(ABR)保证最小流量保证最小流量37IP MAN Solution,Draft 1,April 13,2001流量整形流量整形-Traffic S
42、hapingTraffic Shaping企业企业企业企业个人用户个人用户Shaped VP 电信运营商电信运营商整形后的整形后的 VP 家庭用户家庭用户每个广域网端口支持最多每个广域网端口支持最多256256条条VPVP支持最多支持最多3232条条VPVP被整形被整形可以提供统一的可以提供统一的ATMATM服务以保证与公共物理流量一致服务以保证与公共物理流量一致整形参数整形参数最小速率最小速率=6 =6 信元信元/秒秒最大速率最大速率=线速线速最大信元时延最大信元时延=45 =45 微秒微秒(最坏情况最坏情况)38IP MAN Solution,Draft 1,April 13,2001Ma
43、ximum Fill Amountand PPD Threshold(Configurable)EPD Threshold(Configurable+Enable/Disable)EFCI Mark and CLP Drop Threshold(Fixed at 50%,Selectively Enable or Disable)50%Port/ShelfBufferEPD/PPDEPD/PPDOffers user-configurable thresholdsOffers user-configurable thresholds(per VC)(per VC)Each VC checks
44、to see how it is doing against port-Each VC checks to see how it is doing against port-level buffer thresholdlevel buffer thresholdDropping can be on packet boundaries(EPD,PPD)Dropping can be on packet boundaries(EPD,PPD)if VC is configured for AAL5if VC is configured for AAL539IP MAN Solution,Draft
45、 1,April 13,2001PVC PVC 支持支持VP VP 和和 VC VC 交换交换UNI UNI 信元格式信元格式(8-(8-bit VP bit VP 字段字段)支持硬件寻址支持硬件寻址支持每个用户线路可设置支持每个用户线路可设置256256条条VCVC支持硬件存表支持硬件存表每个系统可设置每个系统可设置512512K K的双向的双向VCVC40IP MAN Solution,Draft 1,April 13,2001SVC SVC 支持支持ITU,ATM Forum UNI 3.1/4.0 ITU,ATM Forum UNI 3.1/4.0 SPVCSPVC65K VCs/65
46、K VCs/系统系统256 256/端口(用户端口)端口(用户端口)250 250 呼叫呼叫/秒秒IISP(IISP(静态静态)和和 PNNI(PNNI(动态动态)呼叫路由呼叫路由关于带宽管理的呼叫控制关于带宽管理的呼叫控制 用户可以制定相关策略用户可以制定相关策略41IP MAN Solution,Draft 1,April 13,2001SPVC Soft PVC -Reduce manual configuration steps of PVC at each hop -Subscriber provisioning is easier on subtended DSLAMs -PVC
47、with reroute or retry capability -Soft PVC will be established only if neighbors discover each otherPVCSoft PVCPCCPEDSLAMATM Network6400NSPNRP1/3210/326260(config)#int atm1/16260(config-int)#atm soft-vc 1 32 dest-address NSAP address 10 326260(config)#int atm0/16260(config-int)#atm signalling enable
48、6400NSP#show atm address6400NSP(config)#int atm1/0/06400NSP(config-int)#atmsignalling enable6400NRP#int atm0/0/0.1326400NRP(config-int)#atm pvc 10 3242IP MAN Solution,Draft 1,April 13,2001通过通过IPIP完成投资保护完成投资保护 IPATMVCATM 交换交换CBR,UBR,ABR,VBR(rt&nrt)ADSL,SDSL,G.SHDSL,IDSL IP 路由路由MPLS 边缘边缘 LSR,桥接桥接,RBEP
49、PP终结终结,IP QoS/CoS VP当前在当前在DSL交换中实现交换中实现IP的领先地位的领先地位Cisco 6000 MPLS数据主干数据主干信元主干信元主干43IP MAN Solution,Draft 1,April 13,2001非非非非 MPLSMPLSMPLSMPLSMPLS/VPN:MPLS/VPN:高性能高性能 ATM+IP ATM+IP 解决方案解决方案 MPLS/VPN 减少阻塞并且通过减少阻塞并且通过L2TP隧道可以提高网络流量效率,每个隧道可以提高网络流量效率,每个DSLAM的每的每块块NI-2模块可以支持模块可以支持50个个VPN 通过提供增强业务给现有的和潜在的
50、商业用户可以使电信运营商获得巨大的利润通过提供增强业务给现有的和潜在的商业用户可以使电信运营商获得巨大的利润 ATM+IP 功能功能,如如 MPLS,提供投资保护提供投资保护44IP MAN Solution,Draft 1,April 13,2001How about security?Security is comparable to todays ATM or FR network.Who are the target customers?Customers could be any enterprise with a large number of remote sites conne