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fdt ICT 2013: Designing an Hybrid Data Center Infrastructure

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Slides used during "fdt ICT 2013" event in Milan on September the 19th. Topic is how integrate different devices in a data center and avoid unexpected behavior/downtime.

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fdt ICT 2013: Designing an Hybrid Data Center Infrastructure

  1. 1. Designing an Hybrid Data Center Infrastructure A "What-if" analysis Andrea Dainese - Data Center Engineer
  2. 2. Data Center topology (8 years ago) Devices ● ● ● ● Cisco Catalyst 6500 (core) Cisco Catalyst 3560 (access) Physical servers FC Storage
  3. 3. Data Center topology (8 years ago) What-if ● ● ● a core switch power down? ← an access switch power down? a fiber became unidirectional? Problems ● ● ● L2 Loops FHRP ← black hole caused by STP convergence ← Solutions ● ● ● ● ● HSRP/GLBP ← UDLD RPVST ← Storm Control VSS + PortChannel ← Conclusions ● lossy network ←
  4. 4. Data Center topology (8 years ago) What-if ● ● ● a core switch power down? an access switch power down? ← a fiber became unidirectional? Problems ● ● ● L2 Loops FHRP black hole caused by STP convergence ← Solutions ● ● ● ● ● HSRP/GLBP UDLD RPVST ← Storm Control VSS + PortChannel ← Conclusions ● lossy network ←
  5. 5. Data Center topology (8 years ago) What-if ● ● ● a core switch power down? an access switch power down? a fiber became unidirectional? ← Problems ● ● ● L2 Loops ← FHRP black hole caused by STP convergence Solutions ● ● ● ● ● HSRP/GLBP UDLD ← RPVST Storm Control ← VSS + PortChannel ← Conclusions ● lossy network ←
  6. 6. Data Center topology (8 years ago) What-if ● ● ● a core switch power down? an access switch power down? a fiber became unidirectional? ← Problems ● ● ● L2 Loops ← FHRP black hole caused by STP convergence Solutions ● ● ● ● ● HSRP/GLBP UDLD ← RPVST Storm Control ← VSS + PortChannel ← Conclusions ● lossy network ←
  7. 7. Data Center topology (8 years ago) What-if ● ● ● a core switch power down? an access switch power down? a fiber became unidirectional? ← Problems ● ● ● L2 Loops ← FHRP black hole caused by STP convergence Solutions ● ● ● ● ● HSRP/GLBP UDLD ← RPVST Storm Control ← VSS + PortChannel ← Conclusions ● lossy network ←
  8. 8. Data Center topology (4 years ago) Evolutions ● ● ● needing a cheaper/easier storage network needing a faster Ethernet network 50% physical - 50% virtual servers Devices ● ● ● ● Cisco Nexus 5000 (10 GbE core) Cisco Nexus 2000 (10 GbE access) Virtual servers NetApp storage (iSCSI/NFS)
  9. 9. Data Center topology (4 years ago) What-if ● ● a SCSI transmission is lost/delayed? a cluster heartbeat is lost/delayed? Problems ● ● SCSI over a lossy network Cluster heartbeat over a lossy network Solutions ● ● VMware Tools Timeouts Conclusions ● SCSI doesn't like lossy networks
  10. 10. Data Center topology (today) Evolutions ● ● needing an unified cabling 10% physical - 90% virtual servers Devices ● ● ● Blade Servers Virtual Appliance Unified Cabling (2 fibers bring everything)
  11. 11. Data Center topology (today) What-if ● a BPDU is transmitted by a VM? Problems ● BPDUs shut down all VMware servers Solutions ● Knows your devices Conclusions ● Hybrid devices behave unexpectedly Notes ● ● Nexus 1000v or vSphere 5.1 can filter BPDUs Reject “Forged Transmit” is not a solution
  12. 12. Data Center topology (today) What-if ● a BPDU is transmitted by a VM? Problems ● BPDUs shut down all VMware servers Solutions ● Knows your devices Conclusions ● Hybrid devices behave unexpectedly Notes ● ● Nexus 1000v or vSphere 5.1 can filter BPDUs Reject “Forged Transmit” is not a solution
  13. 13. Data Center topology (today) What-if ● a BPDU is transmitted by a VM? Problems ● BPDUs shut down all VMware servers Solutions ● Knows your devices Conclusions ● Hybrid devices behave unexpectedly Notes ● ● Nexus 1000v or vSphere 5.1 can filter BPDUs Reject “Forged Transmit” is not a solution
  14. 14. Data Center topology (today) What-if ● a BPDU is transmitted by a VM? Problems ● BPDUs shut down all VMware servers Solutions ● Knows your devices Conclusions ● Hybrid devices behave unexpectedly Notes ● ● Nexus 1000v or vSphere 5.1 can filter BPDUs Reject “Forged Transmit” is not a solution
  15. 15. Conclusions I. Ethernet is a lossy network Be sure your software can tolerate connection reset, packet loss/delay. II. Software/Hardware integration can behave unexpectedly Be aware of what your are including in your data-center and how to best configure it.
  16. 16. Thanks andrea.dainese@gmail.com http://www.routereflector.com/ http://www.linkedin.com/in/adainese @adainese Andrea Dainese

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