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festival ICT 2013: Designing an Hybrid Data Center Infrastructure

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  • 1. A "What-if" analysis Andrea Dainese - Data Center Engineer Designing an Hybrid Data Center Infrastructure
  • 2. Data Center topology (8 years ago) Devices ● Cisco Catalyst 6500 (core) ● Cisco Catalyst 3560 (access) ● Physical servers ● FC Storage
  • 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 ● NHRP ← ● black hole caused by STP convergence ← Solutions ● HSRP/GLBP ← ● UDLD ● RPVST ← ● Storm Control ● VSS + PortChannel ← Conclusions ● lossy network ←
  • 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 ← ● NHRP ● black hole caused by STP convergence Solutions ● HSRP/GLBP ● UDLD ← ● RPVST ● Storm Control ← ● VSS + PortChannel ← Conclusions ● lossy network ←
  • 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 ← ● NHRP ● black hole caused by STP convergence Solutions ● HSRP/GLBP ● UDLD ← ● RPVST ● Storm Control ← ● VSS + PortChannel ← Conclusions ● lossy network ←
  • 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 ← ● NHRP ● black hole caused by STP convergence Solutions ● HSRP/GLBP ● UDLD ← ● RPVST ● Storm Control ← ● VSS + PortChannel ← Conclusions ● lossy network ←
  • 7. 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)
  • 8. 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
  • 9. 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)
  • 10. Data Center topology (today) What-if ● a Cisco Nexus 5000 reboots? ● a BPDU is transmitted by a VM? ← Problems ● Failover does not work anymore ● 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
  • 11. Data Center topology (today) What-if ● a Cisco Nexus 5000 reboots? ● a BPDU is transmitted by a VM? ← Problems ● Failover does not work anymore ● 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. Data Center topology (today) What-if ● a Cisco Nexus 5000 reboots? ● a BPDU is transmitted by a VM? ← Problems ● Failover does not work anymore ● 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. Data Center topology (today) What-if ● a Cisco Nexus 5000 reboots? ● a BPDU is transmitted by a VM? ← Problems ● Failover does not work anymore ● 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. 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.
  • 15. Thanks andrea.dainese@gmail.com http://www.routereflector.com/ http://www.linkedin.com/in/adainese @adainese Andrea Dainese

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