CRS
2015年10月
组网方案与关键业务实施建议
目 录
一、概述 .................................................................................................................................................................. 1 1.1. 有关名词说明 .......................................................................................................................................... 1 1.2. 中国电信宽带互联网现状 ....................................................................................... 错误!未定义书签。 1.2.1. 国际出入口和互联互通层 ................................................................................ 错误!未定义书签。 1.2.2. 路由协议 ............................................................................................................ 错误!未定义书签。 1.2.3. 设备及中继线路情况 ........................................................................................ 错误!未定义书签。 1.2.4. 网络管理 ............................................................................................................ 错误!未定义书签。 1.2.5. 网络业务 ............................................................................................................ 错误!未定义书签。 二、CHINANET面临的严峻挑战 ........................................................................................ 错误!未定义书签。 2.1. 2.2. 2.3. 2.4.
网络结构 ................................................................................................................... 错误!未定义书签。 设备 ........................................................................................................................... 错误!未定义书签。 链路 ........................................................................................................................... 错误!未定义书签。 路由 ........................................................................................................................... 错误!未定义书签。
三、CISCO CRS产品及关键技术介绍 ............................................................................................................... 3 3.1. 高度可扩展的路由器集群系统 .............................................................................................................. 4 3.2. 业界领先的CRS-X ................................................................................................................................. 7 3.2.1. 强大的系统容量和客户投资保护 ................................................................................................... 7 3.2.2. 业界唯一同时提供平滑的横向和纵向升级能力 ........................................................................... 9 3.2.3. 业界最强的100GE/40GE/10GE能力 ........................................................................................... 10 3.2.4. “绿色”路由器 .............................................................................................................................. 14 3.3. 不中断业务升级 .................................................................................................................................... 16 3.4. 已成功部署的链路捆绑和不等价负载分担 ........................................................................................ 17 3.5. 高度可扩展的路由迭代技术 ................................................................................................................ 18 3.6. 网络增值业务功能 ................................................................................................................................ 19 四、中国电信CHINANET网络扩容工程技术方案......................................................................................... 21 4.1. 总体建议 ................................................................................................................................................ 21 4.2. 网络结构 ................................................................................................................................................ 24 4.3. 路由组织 ................................................................................................................................................ 25 4.3.1. IGP .................................................................................................................................................. 25 4.3.2. BGP ................................................................................................................................................. 29 4.4. 设备配置 ................................................................................................................................................ 33 4.5. 链路设计 ................................................................................................................................................ 33 4.5.1. 物理链路技术选择 ......................................................................................................................... 33 4.5.2. 城域网上联ChinaNet骨干网 ....................................................................................................... 38 4.5.3. ChinaNet内部10G/40G/100G链路混用方案 .............................................................................. 41 4.5.4. 100G电路作为骨干网中继链路 ................................................................................................... 46 4.6. 层间融合和协调 .................................................................................................................................... 46 4.6.1. IP/MPLS与OTN的协调 ............................................................................................................... 46 4.6.2. IP+光融合控制平面nLight ........................................................................................................... 51 4.6.3. 彩光技术(IPoDWDM) .................................................................................................................... 54 4.7. IPV6 ........................................................................................................................................................ 61 4.7.1. 中国电信业务发展与地址枯竭的矛盾 ......................................................................................... 61 4.7.2. IPv6分析 ........................................................................................................................................ 62 4.7.3. IPV6过渡阶段划分建议................................................................................................................ 63 4.7.4. IPv6过渡技术选择 ........................................................................................................................ 63 4.8. 网络服务质量 ........................................................................................................................................ 65 4.8.1. 差分服务 ......................................................................................................................................... 65 4.8.2. CRS路由器支持的QoS特性 ........................................................................................................ 67
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4.8.3. ChinaNet部署QoS建议................................................................................................................ 68 4.9. 网络安全 ................................................................................................................................................ 69 4.9.1. 确定被保护的对象 ......................................................................................................................... 70 4.9.2. 评估攻击方式、可能性及防护手段 ............................................................................................. 70 4.9.3. 定期总结并加以完善 ..................................................................................................................... 71 4.9.4. 使用Loose uRPF作为DOS/DDOS攻击的快速反应工具 .......................................................... 72 4.9.5. 使用CISCO CRS先进的网络安全体系结构 ............................................................................... 78 4.9.6. 将网络基础设施隐藏起来避免攻击 ............................................................................................. 80 4.10. NTP时钟设计 ..................................................................................................................................... 87 4.11. CHINANET路由反射器 ........................................................................................... 错误!未定义书签。 五、CISCO方案主要优势 .................................................................................................................................. 88 5.1. 网络扩展性 ............................................................................................................................................ 88 5.2. 网络可用性 ............................................................................................................................................ 88 5.2.1. 可用性定义 ..................................................................................................................................... 88 5.2.2. CRS系统的高可用性 ..................................................................................................................... 90 5.2.3. CRS IOS-XR操作系统的高可用性 ............................................................................................... 91 5.2.4. 可以预测、可以测量的可靠性 ..................................................................................................... 92 5.3. 多业务平台 ............................................................................................................................................ 92 5.4. 先进的CRS 体系结构 .......................................................................................................................... 94 5.4.1. CRS的硬件体系结构 ..................................................................................................................... 94 5.4.2. CRS先进的软件体系结构 ........................................................................................................... 101 六、总结 .............................................................................................................................................................. 110 附录1：CRS 集群系统连接示意图 ................................................................................................................. 112
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一、概述
1.1. 有关名词说明
本技术方案建议书将用到以下专用名词， 在此作一说明。
英文缩写 6RD ASBR BFD BGP BGP PIC BRAS CAR CBWFQ CCN CEF CGN CGSE DC DiffServ DSCP DS.Lite DWDM E-FEC EPC FEC IS-IS IGP I-SPF LDP MPLS MPLS-TP NPS OAM OCh ODU ODU-FLEX OMS OPU OTN OTS OTU PON QoS RADIUS ROA RP RPKI RPL 英文全称 IPv6 Rapid Deployment Autonomous System Border Router Bidirectional Forwarding Detection Border Gateway Protocol BGP Prefix Independent Convergence Broadband Remote Access Server Committed Access Rate Class-Based Weighted Fair Queueing Cloud Centric Network CISCO Express Forwarding Carrier Grade NAT Carrier Grade Services Engine Data Center Differentiate Service Diff-Serv Code Point Dual Stack Lite Dense Wavelength Division Multiplexing Enhanced Forward Error Correction Evolved Packet Core Forward Error Correction Intermediate System to Intermediate System Interior Gateway Protocol Increment SPF Label Distribution Protocol Multi-Protocol Label Switching MPLS Transport Profile Network Proximity Service Operation Administration Maintenance Optical Channel Optical Data Unit Optical Data Unit Flexible Optical Multiplex Section Optical Path Unit Optical Transport Network Optical Transmission Section Optical Transport Unit Passive Optical Network Quality of Service Remote Authentication Dial In User Service Route Origin Attestations Route Processor Resource Public Key Infrastructure Routing Policy Language 中文全称 IPv6快速部署 自治域边界路由器 双向转发检测 边界网关协议 与BGP前缀无关的收敛 宽带接入服务器 承诺的接入速率 基于类的加权公平排队 以云计算为中心的网络 思科快速交换 运营商级地址转换 运营商级服务引擎 数据中心 差分服务 差分服务码点 轻量双栈 密集波分复用 增强型前向纠错 演进分组核心 前向纠错 中间系统到中间系统 域内网关协议 增量SPF算法 标签分发协议 多协议标签交换 传送多协议标记交换 网络就近性服务 操作、管理和维护 光通道 光数据单元 灵活的光数据单元 光复用段 光通道净荷单元 光传送网 光传送段 光传送单元 无源光网络 服务质量 远程拨入用户验证服务 路由源认证 路由处理引擎 资源公钥体系 路由策略语言 1
英文缩写 SNMP SPF SR TACACS TCO TDM TE uRPF VPN VOQ WRED WRR 英文全称 Simple Network Management Protocol Shortest Path First Service Router Terminal Access Controller Access-Control System Total Cost of Ownership Time Division Multiplexing Traffic Engineering unicast Reverse Path Forwarding Virtual Private Network Virtual Output Queue Weighted Random Early Dectection Weighted Round-Robin 中文全称 简单网络管理协议 最短路径算法 业务路由器 终端访问控制器访问控制系统 总体拥有成本 时分复用 流量工程 单播反向路径转发 虚拟专用网 虚拟输出队列 加权随机早期检测 加权循环队列调度 2
CRS组网方案与关键业务实施建议
