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PCECP Requirements for support of Global Concurrent Optimization

This document outlines the requirements for support of global concurrent optimization, an application of path computation that computes a large number of TE-paths concurrently to meet a global objective by considering network resources and topology. It discusses the motivation, application scenarios, and architecture for PCE-based global concurrent optimization.

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PCECP Requirements for support of Global Concurrent Optimization

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  1. PCECP Requirements for support of Global Concurrent Optimization <draft-lee-pce-global-concurrent-optimization> Y. Lee, Huawei, D. King, Aria Networks, E. Oki, NTT 67th IETF - San Diego, CA, USA November 8, 2006

  2. What is Global Concurrent Optimization? An application of path computation in which we compute a large number of TE-paths concurrently to meet a global objective by looking at the entire set of network resources and topology. 67th IETF - San Diego, CA, USA November 8, 2006

  3. Motivation • Sequential path computation may result in sub-optimal use of network resources in some applications. • Efficient utilization of network resources from a global network perspective that would to translate operations cost saving • For example, full network re-optimization • A PCE supporting concurrent path computation would have the ability to consider global network capacities and properties, all service requirements and constraints, and then optimally place all services to meet the service requirements within the confines of the network infrastructure. 67th IETF - San Diego, CA, USA November 8, 2006

  4. A simple path computation trap problem Consider a simple network topology • All links are 5Mbps • Various link costs Node 5 Cost 10 Cost 10 Cost 1 Cost 1 Cost 1 Node 1 Node 2 Node 3 Node 4 • Request two least cost paths form Node-1 to Node-4 with bandwidth 3Mbps. • Sequential computation places first LSP on the path 1-2-3-4.Second LSP cannot be placed. • Parallel computation can place both LSPs as 1-5-3-4 and 1-2-6-4. Cost 10 Cost 10 Node 6 Many more LSPs, many ingresses and egresses, and a more complex network make the problem much harder. 67th IETF - San Diego, CA, USA November 8, 2006

  5. Application Scenarios • Greenfield Traffic Engineering • Re-optimization of Existing Networks • Traffic Migration • Catastrophic Failure • Pre-establishment of the H-LSP in Multi-Layer Traffic Engineering • Reconfiguration of the VNT 67th IETF - San Diego, CA, USA November 8, 2006

  6. PCE-based Architecture for PCE Global Concurrent Optimization Application application request PCECP request/ response TED NMS PCE service requests Head End Nodes Adjacent Nodes Reference: RFC4655 Section 5.5 – Management-Based PCE Usage 67th IETF - San Diego, CA, USA November 8, 2006

  7. Application-Specific Protocol Requirements • Indicator field for global concurrent optimization • Global objective function field • Global constraints field • Global concurrent vector field • Indicator for failure of global concurrent optimization • Multi-session indicator • List of existing LSP to be kept intact • More to be identified 67th IETF - San Diego, CA, USA November 8, 2006

  8. Summary & Next Step • This I-D provides application-specific PCECP requirements for support of global concurrent optimization • This I-D supplements the PCECP generic requirements [RFC4657] and is compliant to PCE-based architecture [RFC4655] • To be considered as WG document • Solicit complete set of requirements • Begin protocol work for this application upon consensus 67th IETF - San Diego, CA, USA November 8, 2006

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