Datacenter Design Guide Wp

Data Center Networking – Connectivity and Topology Design Guide

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Table o Contents Executive Summary........................................................................... ................................................................................................................... ............................................2  ....2  Data Center Network Design Goals .................................................................................................3  .................................................................................................3  Data Center Connectivity Trends Trends ........................................... .................................................................................... ..........................................................4  .................4 

10G, 40G, 100G .................................................................. .......................................................................................................... ...................................................4 ...........4 Storage I/O Consolidation Consolidation .........................................................................................................5 .........................................................................................................5 Main Components of the Data Center ..................................................................... .............................................................................................5  ........................5 

Servers......................................... ................................................................................. ................................................................................. ...................................................5 ..........5 Storage ........................................ ................................................................................ ................................................................................. ...................................................6 ..........6 Connectivity Connectivity ....................................... ................................................................................ ................................................................................. ............................................6 ....6 Data Center Connectivity and Topology Topology ....................................................................................... ...........................................................................................6  ....6 

Topology – Physical Designs..................................... .............................................................................. .................................................................6 ........................6 Two-Tier wo-Tier Design ................................... ............................................................................ ..............................................................................6 .....................................6 Three-Tier Three-Tier Design ....................................... ............................................................................... .......................................................................7 ...............................7 Top o Rack ....................................................... ............................................................................................... ................................................................8 ........................8 End o Row ........................................................................... ................................................................................................................... ............................................9 ....9 Data Center LAN Fabric Resiliency Resiliency .....................................................................................10 .....................................................................................10 Capacity and Performance Planning Pl anning Considerations for the Data Center ........................................ ............................................11 ....11

High Availability Availability Requirements Requirements................................................................................. ...........................................................................................11 ..........11 Oversubscription Oversubscription in the Data Center Network........................................ .......................................................................11 ...............................11 Incast, Micro Bursts, Buering........................................ ................................................................................. ...................................................13 ..........13 Topology - Logical Designs ..................................................... ............................................................................................. ...................................................14 ...........14 Layer 2 Edge Designs ........................................................................................................14 ........................................................................................................14 Layer 2 Core Designs ............................................................................................... .........................................................................................................16 ..........16 Layer 3 Core Designs ............................................................................................... .........................................................................................................16 ..........16 Separation – VRF, MPLS ....................................................................................................17 MPLS ....................................................................................................17 Data Center Interconnect Interconnect ....................................................... ............................................................................................... ...................................................17 ...........17 Service and Security Layer Insertion....................................... ............................................................................... ...................................................20 ...........20 Potential Potential Concerns with Service and Security Layer Products..................................... ................................................21 ...........21 Load Balancing with the Enterasys S-Series S-Series ........................................................................21 ........................................................................21 Data Center Connectivity – Best Practices with Enterasys Products ......................................... ...................................................22  ..........22 

Enterasys 2-tier Design – Top o Rack (ToR) .................................. ........................................................................... .............................................23 ....23 Enterasys 2-tier Design – End o Row (EoR) .................................. ........................................................................... .............................................24 ....24 Conclusion Conclusion ................................... ........................................................................... ................................................................................. ...................................................25 ..........25

Executive Summary Demand or application availability has changed how applications are hosted in today’s data center. Evolutionary changes have occurred throughout the various elements o the data center, starting with server and storage virtualization and also network virtualization. Main motivations or server virtualization were at rst associated with massive cost reduction and redundancy and evolved to scalability and agility. Data center LAN technologies have taken a similar path; with a goal o redundancy and then to create a more scalable abric within and between data centers. Business requires next generation networks to change ocus rom redundancy to resiliency. While it may seem that redundancy and resiliency are one and the same, they are not. Redundancy simply requires duplication o systems. Resiliency is the ability o the solution to “adapt” to the consequences o ailure. Today’s data center must meet a number o business requirements and overcome several design obstacles in order to truly achieve resiliency. Business requirements

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