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互联网运维大会 刘洋-2011-jul 1
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互联网运维大会 刘洋-2011-jul 1

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  • 1. 从“路由”回归“交换” --探讨数据中心网络的演变 刘 洋 思科中国互联网运营商事业部 技术总监
  • 2. “交换”的烦恼•物理连接层次•透明生成树,二层多路径,网络收敛•Unicast Flooding,环路,广播风暴
  • 3. “路由”后的幸福生活•ECMP(Equal Cost Multi Path);•平滑扩展;•快速收敛;•防止广播风暴;
  • 4. 烦恼•集群的规模•网段地址规划•路由控制平面•虚机•开放平台,云计算•价格•Dumb Big Flat
  • 5. 从“路由”回归“交换”--大型数据中心的交换网络 FabricPath• Turn your network into a Fabric!• 关键技术:FabricPath / Trill
  • 6. FabricPath对于二层交换的创新• 实现交换机间多条路径同时转发流量ECMP(EqualCost Multi Path);去除透明生成树• 类似路由网络的平滑扩展;• 快速收敛;• 防止广播风暴(TTL);• 保持原有二层网络• 基于会话的MAC地址学习• 成本降低
  • 7. FabricPath的设计目标Switching FabricPath Routing Minimal Configuration  Configuration Intense Plug & Play  Configured Learning Auto Discovery  Configured Discovery Auto Learning  Plan & Play Flat Addressing  Fast Convergence Spanning Tree Protocol  Multiple Paths (STP)  Load Balancing Slow Convergence  Multiple Multicast Trees Single Path  Hierarchical Forwarding Edge-to-Root Rigid Design  Any-to-any Flexible Design Single Multicast Tree  Highly Scalable Constrained Scaleability
  • 8. Architectural Approach for MSDC Scale-Up Spine Lean Core CLOS Scale-Out Leaf Smart Edge Same node type used in  High density spine  Layer-1.5 Spine all roles (Spine and node (Dumb Core) Edge) Fine Grain Redundancy  Smaller fixed leaf  Intelligent Edge Additional density  Fewer control provided through planes than pure density of node or additional layers Clos
  • 9. Fabricpath 构建通用网络交换平台 POD 1 POD 2 POD 3 PODS 1-3 VLANs 100-199 VLANs 200-299 VLANs 300-399 VLANs 100-399
  • 10. 大规模数据中心的通用网络交换平台--网络对业务部署灵活性的支持 模块化 易扩展 网络带宽及延时的一致性 与服务器所处位置无关 业务的快速部署 计算资源的灵活移动和调配 Any service on any server, at any time!!! 可扩展性 业务/集群的扩展不再受制于网络 服务器的使用效率 服务器重复利用 可管理性 即插即用,配置最简化,人工干预少 可靠性 单点故障对整体业务的影响
  • 11. 从“路由”回归“交换” --中小型数据中心的交换网络 Nexus 7000/5000 Virtualized chassis Nexus 5000 + Nexus 2000 Fabric Extender =• Turn your network into a Switch• 关键技术:远端扩展模块,FEX as TOR
  • 12. Data Center-Wide Scalability at Layer 2 • 扁平化结构 • 应用在更大区域的灵活部署 • 线速的网络
  • 13. 谢谢