Tag: DCI

Distributed Data center Goals

• Ensure business continuity
• Distributed applications
• Seamless workload mobility
• Maximize compute resources

Challenges in traditional Layer 2 VPN:

• Flooding Behavior
  • Unknown unicast for mac propagation
  • Unicast Flooding reaches all sites
• Pseudo-wire Maintenance
  • Full mesh of Pseudo-wire is complex
  • Head-End replication is a common problem
• Multi-Homing
  • Requires additional protocols and extends STP
  • Malfunctions impact multipe sites

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https://www.cisco.com/c/dam/en/us/solutions/collateral/data-center-virtualization/data-center-interconnect/at_a_glance_c45-493703.pdf

• Types of Data Center Interconnections
  • Layer 1 DCI
    • Physical connection between Data Centers
      • Dark Fiber ( MetroE)
      • Fibrechannel
    • Not as flexible
  • Layer 2 DCI
    • Carrier appears as L2 Bridge
    • MPLS options
    • VPLS options
    • IP Mobility
  • Layer 3 DCI
    • IP Based connection
      • iSCSI
      • Routing
      • ATOMoGRE

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