Journal
IEEE COMMUNICATIONS LETTERS
Volume 24, Issue 6, Pages 1299-1303Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/LCOMM.2020.2979072
Keywords
Steiner trees; Synchronization; Computational modeling; Resilience; Switches; Standards; Software defined networks; inter-controller communication; network state synchronization; controller placement; steiner tree model
Categories
Funding
- Singapore MoE AcRF Tier-2 [MOE2015-T2-2-116]
- NUS WBS [R-263-000-C17-112]
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In a multi-controller SDN, the network state is replicated or distributed between the controllers requiring repeated synchronization. This synchronization cost depends on controller locations, as well as needs to be low and resilient to network failures. Leveraging a Steiner tree-based inter-controller latency model, a multi-objective integer linear program is presented to deduce the controller placement optimizing (a) synchronization cost in failure-free scenarios, and, (b) resilience against single-link failures. The proposed approach incurs low computational complexity and post-failure network reconfiguration cost, while achieving near-optimal post-failure synchronization cost. We extensively evaluate the proposed model over real networks, and demonstrate its effectiveness.
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