Distributed Control Plane Differentiated Reliability in Distributed Survivable Optical Mesh Networks Dhruvish Shah, Dr. Marco Tacca and Dr. Andrea Fumagalli Optical Networks Advanced Research (OpNeAR) Lab Node Architecture Network Architecture Distributed Control Plane 4 1 3 2 5 Free Queue Busy Queue Request Dropped Advantages: No Central Controller Less signaling compared to centralized counterpart Less set-up delay Limitations: More connection blocking Complex Node Architecture Distributed Control Plane IP Over WDM Mesh Network with Distributed Control Plane Multiple wavelengths and fibers per link Per source node queue for fairness in blocking On-Line Optimized Routing and Wavelength Assignment (RWA) based on Differentiated Reliability (DiR) and Shared Path Protection (SPP) Simulation Scenario Network Protocols Network Protocols (Contd.) Berkeley Network Simulator (NS2) 19 Node European Topology with 39 bidirectional links Poisson arrivals, uniformly distributed among nodes, exponential demand lifetime One fiber in each direction of propagation Maximum Conditional Failure Probability (MCFP) of 0.03 assuming single link failure scenario allowing single unprotected link on working lightpath RWA: Source computes lightpath resources Optimize network resources with Simulated Annealing Linear (LB) and Matrix DPM approach CRANKBACK: Contentions cause lightpath set-up failure Reattempt to set-up lightpath until successful Avoid using the resource which was contended for successive RWA computations Aggressive reattempts Ensures fairness for longer lightpaths RSVP and Modified OSPF: Destination initiated reservation Event driven node based OSPF for data synchronization Summary Comparison of DSPP-DiR with DSPP Distributed and Centralized Control Planes Probability Distribution With only one unprotected link the DSPP-DIR scheme reduces blocking dramatically As traffic becomes faster, due to lack of faster synch blocking increases The Distributed Control Plane performs almost same as its Centralized counterpart at light load, blocking increases more rapidly at higher load Single buffer queue at each source node and CRANKBACK ensure fairness among nodes