Prof.Veeraraghavan Prof.Karri Haobo Wang: haobo_w@photon.poly.edu Hardware Accelerated Signaling and its Application in Fast Network Restoration Prof.Veeraraghavan Prof.Karri Haobo Wang: haobo_w@photon.poly.edu

Background What’s signaling? Primarily implemented in software Signaling protocols are used in connection-oriented networks to set up and tear down connections. Primarily implemented in software Complexity and the requirement for flexibility What we pay is the performance Hardware accelerated signaling Why? 100x-1000x speedup How? FPGA+Hardware/software Codesign

Which is better? “Thin” hardware signaling engine Simple signaling addressed to single application Optical Circuit Signaling Protocol – OCSP Simple, for SONET network only Hardware accelerated signaling engine “Panacea” signaling – RSVP-TE for GMPLS Complex but covers all connection-oriented networks Hardware/Software Codesign Time-Critical functions->hardware Non-Time-Critical functions->software

Network and node view

Architecture of Prototype Board

Hardware Signaling Accelerator

Applications of Hardware signaling High throughput Support large scaled core switches – TCP switching Low call setup delay Fast restoration after network fails Illinois, May 1988, a fire at a local exchange center caused the loss of service to 35,000 residential telephones Today, data traffic prevails, more sensitive to loss One single fiber may carry T(era)bps of user traffic! Network survivability is essential

Trade-off of different recovery schemes Fast Recovery delay Slow Bad Good Resource utilization Protection Resource reserved in advance Linearly/Ring topology LAPS or SHR Line switching The failure is addressed locally, point-to-point Restoration react to failure dynamically Mesh networks Path switching The failure is addressed globally, end-to-end We want both! High resource utilization and low recovery delay Dynamic re-routing in mesh networks

Dynamic re-routing in Mesh network A disjoint back-up route is pre-calculated, but not allocated Routing table has entries for backup route Hardware signaling helps to set up backup path rapidly May be blocked  A B C D E F

Analysis and simulation (ongoing work) A 13-node, 22-link sample network, average number of hops on primary path is 2.4, on secondary path is 3.5. Analysis of dynamic provisioning (M/D/1/∞) Simulation of dynamic re-routing When link/node fails, all affected paths must be re-routed simultaneously. We use OPNET to model the dynamic re-routing behavior.