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Hawaii Tech Day- DC Switching Design

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DC Switching Design presented at Hawaii Tech Day February 2017

Veröffentlicht in: Technologie
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Hawaii Tech Day- DC Switching Design

  1. 1. Data Center Switching Design Scott Harris Consulting Systems Engineer, Cisco scotharr@cisco.com based on Cisco Live presentation BRK-2208
  2. 2. Agenda • Data Center Ethernet Design • evolution of traditional designs • migrating to an ACI design • Fibre Channel & Ethernet Convergence • Cisco Nexus & MDS Switch Overview: very brief
  3. 3. Design Considerations
  4. 4. Data Center Design: Scale Up vs Scale Out Small Spine/Leaf VXLAN Single Layer DC VXLAN Dual Tier DC Scale Up Scale Out
  5. 5. Connectivity & Features Drive Design Choices  Connectivity Model – 25 or 10 or 1-GigE Server ports – NIC/HBA Interfaces per-server – Copper vs Fiber cabling to ToR  Virtual Networking Requirements – vSwitch/DVS/OVS/Nexus1Kv/AVS  Programmabiltiy/Automation/Orchestration – Complete abstraction – Device or fabric level programmability  Computing Form Factor – Unified Computing Fabric – 3rd Party Blade Servers – Rack Servers (Non-UCS Managed)  Storage & Storage Protocols – Native Fibre Channel – Unified Ports, FCoE – IP-based storage (iSCSI, NAS) VM VM VM iSCSI FCoE FC NFS/ CIFS VM VM VM
  6. 6. Data Center Network Needs • Server virtualization is here • Oversubscription ratio from 20:1 to 1:1 • Horizontal workload mobility • Any VLAN everywhere, no physical boundaries • Highly distributed applications • Hadoop and microservices • More server to server communication • 80/20 traffic pattern reversed? • Increasing high availability requirements • High throughput, low latency • More speed, less human errors EAST – WESTTRAFFIC NORTH-SOUTHTRAFFIC FC FCoE iSCSI / NAS Server/Compute Site B Enterprise Network Internet DATA CENTER NETWORK Public Cloud Mobile Services Storage Orchestration/ Monitoring OffsiteDC API
  7. 7. Why Data Center Network Fabrics? • Flexibility: allows workload mobility, VLANs everywhere • Robustness: reduce failure domains, L2/L3 boundary on leafs, anycast gateway • (Virtual) Network services move out to border leafs, policy-based service chaining • Performance: full cross sectional bandwidth (any-to- any) with ECMP, avoid oversubscription • Latency: deterministic at scale, single hop away • Scalability: add end nodes, maintain oversubscription • Cost: fixed switches vs modular switches EAST – WEST TRAFFIC NORTH-SOUTHTRAFFIC FC FCoE iSCSI / NAS Server/Compute Site B Enterprise Network Internet DATA CENTER FABRIC Cloud Mobile Services Storage Orchestration/ Monitoring OffsiteDC API Definition: ensemble of switches that behave and get configured like a single giant switch
  8. 8. Evolution of Data Center Ethernet Networks
  9. 9. Scaling Data Center Ethernet
  10. 10. Data Center Interconnect (DCI): just a teaser
  11. 11. Fibre Channel & Ethernet Convergence Based on Cisco Live presentation BRKDCN-1902
  12. 12. Traditional Data Center Design Ethernet LAN and Fibre Channel SAN • Physical and Logical separation ofLAN and SAN traffic • Additional Physical and Logical separation of SAN fabrics Isolation Convergence Fabric ‘B’ HBA L2 L3 NIC Fabric ‘A’ FC Nexus 7000 Nexus 5000 MDS 9000 Ethernet FC
  13. 13. Data Center Design with E-SAN Ethernet LAN and Ethernet SAN • Same topologies as existing networks, but using Nexus Unified Fabric Ethernet switches for SANs • Physical and Logical separation of LAN and SAN traffic • Additional Physical and Logical separation of SAN fabrics • Ethernet SAN Fabric carries FC/FCoE & IP based storage (iSCSI, NAS, …) • Common components: Ethernet Capacity and Cost Isolation Convergence Fabric ‘B’ CNA L2 L3 NIC or CNA Fabric ‘A’ FCoE Nexus 7000 Nexus 5000 Nexus 7000 Nexus 5000 Ethernet FC
  14. 14. Converged Access with vPC Sharing Access Layer for LAN and SAN • Shared Physical, Separate Logical LAN and SAN traffic at Access Layer • Physical and Logical separation of LAN and SAN traffic at Aggregation Layer • Additional Physical and Logical separation of SAN fabrics • Storage VDC on Nexus 7000 for additional management / operation separation Isolation Convergence Fabric ‘B’ Ethernet FC Converged FCoE link Dedicated FCoE link L2 L3 CNA Fabric ‘A’ FCFCoE Nexus 7000 Nexus 5000 MDS 9000
  15. 15. Agg BW: 40G FCoE: Ethernet: 40G 40G  One wire for all traffictypes  QoS guarantees minimum bandwidth allocation  No Clear Port ownership  Desirable for DCI Connections  Dedicated wire for a traffictype  No Extra output feature processing  Distinct Port ownership  Complete Storage Traffic Separation HA: 4LinksAvailable Different methods, Producing the same aggregate bandwidth Dedicated Links provide additional isolation of Storage Traffic Dedicated vs. Converged ISLs Why support Dedicated ISLs as opposed to Converged? Agg BW: 40G FCoE: Ethernet: 20G 20G
  16. 16. Converged Network – Dual Fabrics with Dedicated Links Maintaining Dual SAN fabrics with Overlay • LAN and SAN traffic share physical switches • LAN and SAN traffic use dedicated links between switches • All Access and Aggregation switches are FCoE FCF switches • Dedicated links between switches are VE_Ports • Storage VDC for additional management / operation separation Isolation Convergence Nexus 7000 Nexus 5000 Ethernet FC Converged FCoE link Dedicated FCoE link … … L2 L3 CNA FCFCoE FCFFCF FCF VE Fabric ‘A’ Fabric ‘B’ LAN/SAN
  17. 17. Converged Network – Dual Fabrics with Dedicated Links Maintaining Dual SAN fabrics with Overlay • LAN and SAN traffic share physical switches • LAN and SAN traffic use dedicated links between switches • All Access and Aggregation switches are FCoE FCF switches • Dedicated links between switches are VE_Ports • Storage VDC for additional management / operation separation Isolation Convergence Nexus 7000 Nexus 5000 Ethernet FC Converged FCoE link Dedicated FCoE link FabricPath L2 L3 CNA FCFCoE Fabric ‘A’ Fabric ‘B’ FCF FCF FCF FCF VE
  18. 18. Cisco Nexus & MDS Platforms Operational Simplicity Architectural Flexibility Open/ Programmable Resilience and Scale Investment Protection One Operating System - NX-OS Cisco Nexus 2000 Cisco Nexus 9000 Cisco Nexus 3000 Cisco Nexus 1000V L4-7 vServices Cisco Nexus 7000/7700 Cisco Nexus 5000 Cisco MDS 9200 Multiservice Switch Cisco MDS 9700 Series Cisco MDS 9100 Series Cisco MDS 9500 Series

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