《2016hotsdn - Logically Centralized State Distribution Trade-offs in SDN》.pdf

Logically Centralized? State Distribution Trade-offs in Software Defined Networks Dan Levin Andreas Wundsam Brandon Heller TU Berlin / T-Labs ICSI / UC Berkeley Stanford University dan@net.t-labs.tu-berlin.de andi@ brandonh@ Nikhil Handigol Anja Feldmann Stanford University TU Berlin / T-Labs nikhilh@ anja@net.t-labs.tu-berlin.de ABSTRACT this decoupling is the ability to design and reason about the net- Software Defined Networks (SDN) give network designers free- work control plane as a centrally controlled application operating dom to refactor the network control plane. One core benefit of on a global network view (GNV) as its input. In essence, SDN SDN is that it enables the network control logic to be designed and gives network designers freedom to refactor the network control operated on a global network view, as though it were a centralized plane, allowing network control logic to be designed and operated application, rather than a distributed system – logically centralized. as though it were a centralized application, rather than a distributed Regardless of this abstraction, control plane state and logic must system – logically centralized. inevitably be physically distributed to achieve responsiveness, re- Thus, SDN designers now face new choices; in particular,