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Table 1 Primary clusters of the SDN literature based on the proposed model

From: Multi-domain SDN controller federation in hybrid FiWi-MANET networks

  Location distribution Controller integration Management openness Domain heterogeneity
Single datacenter No No/tight No No
Multiple datacenters, centralized controller Yes No No No
Multiple datacenters, distributed controllers Yes Tight No No
Federated datacenters Yes Loosely Yes No
Inter-domain operator Yes Tight No Yes
Federated domains Yes Loosely Yes Yes