English
资源说明：Abstract—The decoupled architecture and the fine-grained
flow control feature of SDN limit the scalability of SDN network.
In order to address this problem, some studies construct the flat
control plane architecture; other studies build the hierarchical
control plane architecture to improve the scalability of SDN.
However, the two kinds of structure still have unresolved issues:
the flat control plane structure can not solve the super-linear
computational complexity growth of the control plane when SDN
network scales to large size; the centralized abstracted hierarchical control plane structure brings path stretch problem. To
address the two issues, we propose Orion, a hybrid hierarchical
control plane for large-scale networks. Orion can effectively
reduce the computational complexity growth of SDN control
plane from super-linear to linear. Meanwhile, we design an
abstracted hierarchical routing method to solve the path stretch
problem. Further, Orion is implemented to verify the feasibility
of the hybrid hierarchical approach. Finally, we verify the
effectiveness of Orion both from the theoretical and experimental
aspects
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