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Data Center Interconnect

Data Center Interconnect

http:://packetflows.com

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Data Center Interconnect

  1. 1. Data Center Interconnect By: Anuj Tyagi
  2. 2. What’s DCI ? Extending data centers beyond traditional boundaries Transport Options? • Dark Fiber • Layer 2 Services aka LAN extension • Layer 3 Services
  3. 3. Why we need DCI ?
  4. 4. Why DCI is necessary? • VM migrations • IP renumbering • VLAN Scaling • Geo-cluster applications • Disaster recovery
  5. 5. Challenges ? • Broadcast storms: Unknown and broadcast frames may create excessive flood • Loops: Easy to form loops in large networks • Tromboning: Dual attached servers and switches generate excessive cross traffic • Security: Data on LAN extension must be encrypted • STP Issues: diameter: more than 7 Root can become bottleneck Multiple path remain unused
  6. 6. Technology selection
  7. 7. OTV vs EVPN+VXLAN vs VPLS • VXLAN gives us liberty to use 2^24 VLANS. VXLAN-EVPN is the data centre technologies. In VPLS we have limited number of VLANS. • In EVPN the mac-learning happens in control plane whereas in VPLS it happens in data plane. Hence, In EVPN this feature reduces the unknown unicast broadcast packets and wastage of resources. • VXLAN is supported by virtual devices and as well as routers. VPLS Is totally based on our backbone. No role in virtual devices.
  8. 8. OTV vs EVPN+VXLAN vs VPLS • OTV does the L2 stretch at the core of the network as opposed to the edge with EVPN. • For core, more cost to deployment as there will be separate circuits • Core is more expensive than Edge
  9. 9. OTV vs EVPN+VXLAN vs VPLS • VPLS relies on MPLS transport; if your DCI link has to use IP infrastructure, you have to configure MPLS over GRE tunnels before you can configure VPLS. • VPLS cannot do all-active forwarding
  10. 10. Design approach?
  11. 11. Design approach?
  12. 12. Design approach?
  13. 13. Design approach?
  14. 14. Design approach?
  15. 15. Consideration for best practices • How STP avoid loops and broadcast storms? • When we combine vMotion with stateful device • Long distance vMotion led to trombing, only suggested in case of Disaster avoidance • How does provider router detect active IP address or subnet? • Which scaling protocols, technology or products to use?
  16. 16. How SDN/Cloud era changing DCI? Orchestration for seamless stretch virtual networks and policies SDN products: • Cisco ACI • VMware NSX • Juniper Contrail
  17. 17. Resources • https://forums.juniper.net/t5/Data-Center-Directions/Does-E-VPN- Spell-the-End-for-OTV/ba-p/231783 • http://www.opencontrail.org/multi-datacenter-interconnect-using- opencontrail/ • https://www.ipspace.net/Data_Center_Interconnects • http://www.cisco.com/c/en/us/products/collateral/switches/catalyst- 6500-series-switches/qa_c67_494606.html • http://demo.ipspace.net/get/X1%20Redundant%20Data%20Center% 20Internet%20Connectivity.mp4 • http://demo.ipspace.net/get/A1%20L2%20DCI%20Mythbusting.mp4

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