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Towards an Elastic Distributed SDN Controller

Towards an Elastic Distributed SDN Controller. Advait Dixit, Fang Hao , Sarit Mukherjee, T.V . Lakshman , Ramana Kompella. SDN Control Plane. Single point of failure Performance bottleneck. Distributed Control Plane. Physical Network Infrastructure. Spatial Partitioning. Overload.

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Towards an Elastic Distributed SDN Controller

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  1. Towards an Elastic Distributed SDN Controller Advait Dixit, Fang Hao, SaritMukherjee, T.V. Lakshman, RamanaKompella

  2. SDN Control Plane • Single point of failure • Performance bottleneck Distributed Control Plane Physical Network Infrastructure

  3. Spatial Partitioning Overload

  4. Growing the Control Plane

  5. Shrinking the Control Plane

  6. Goals • Build a distributed control plane which • Load balances • Grows • Shrinks • This requires • Load estimation at controllers • Switch migration protocol

  7. Naïve Switch Migration MASTER SLAVE MASTER SLAVE Role Change to Master

  8. Problem With Naïve Switch Migration MASTER SLAVE MASTER SLAVE Role Change to Master Packet-In Packet-Out Packet-Out from Slave is dropped

  9. Migration Protocol Requirements • Safety: Exactly 1 controller processes every message from the switch • Liveness: For each switch, at least 1 controller is active at all times • Openflow compliant

  10. 4-Phase Switch Migration Protocol MASTER SLAVE MASTER SLAVE EQUAL Role Change to Master Role Change to Equal Flow-Removed Barrier Reply Flow-Removed Barrier Request Flow-Add Flow-Delete Phase 3: Flush in-flight message Phase 4: Change from Equal to Master Phase 2: Insert and remove dummy flow Phase 1: Change from Slave to Equal

  11. A MininetTestbed Problem: Cannot generate sufficient traffic for a large distributed control plane OpenvSwitch OpenvSwitch veth Pair OpenvSwitch veth Pair veth Pair Emulation Host

  12. A Multi-Host MininetTestbed GRE Tunnel OpenvSwitch OpenvSwitch OpenvSwitch OpenvSwitch OpenvSwitch OpenvSwitch GRE Tunnel ` OpenvSwitch OpenvSwitch OpenvSwitch Emulation Host Emulation Host GRE Tunnel Emulation Host

  13. Evaluation

  14. Evaluation

  15. Next Step: ElastiCon Load Adaptation Decisions Load Balance Scale Up Scale Down • Actions: • Migrate switch • Remove controller • Add controller Load Measurements Distributed Data Store (e.g., Hazelcast) Distributed SDN Control Plane Application 2 Application 1 Application 2 Application 1 Core Controller Module Core Controller Module Node 1 Node 2 Physical Network Infrastructure

  16. Thank you

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