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Routing Based on Outdated Information in MultiDomain MultiLayer Networks

This research examines inter-domain routing in multi-layer networks, emphasizing the challenges posed by outdated information. We explore motivations, standardization efforts, and propose an innovative approach that highlights gaps in existing methodologies. Our findings reveal the impact of information refresh intervals on blocking ratios during routing setups, demonstrating the trade-off between flooding accuracy and timely information updates. We provide empirical results from tests carried out on a hypothetical topology, contributing to the development of fault-tolerant, scalable optical networks that align with industry standards.

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Routing Based on Outdated Information in MultiDomain MultiLayer Networks

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  1. János Szigeti János Tapolcai Tibor Cinkler Routing Based on Outdated Information in MultiDomain MultiLayer Networks High-Speed Networks Laboratory Dept. of Telecommunications and Media Informatics Budapest University of Technology and Economics

  2. Outline • Motivations • Standardization • Our approach • Gaps • Tests & Results • Conclusion

  3. Motivations • Optical • Multilayer • Fault tolerant • Scalable • Supports standards

  4. Standardization • Institutions: • ITU-T • IETF • OIF • ATM Forum • Covered Issues • Network planes (ASON/ASTN) • Source routing (GMPLS) • Interfaces (E-NNI)

  5. ASON Control Plane GMPLS data encapsulation levels: • fibre • wavelength • timeslot (grooming) • packet

  6. GMPLS Layers Data encapsulation levels: Fibre, Wavelength,Timeslot (grooming), packet

  7. OIF-UNI/E-NNI • Neighbor (topology) discovery • Service discovery • (Abstract) reachability information • (Abstract) signalling for connection Setup / Release

  8. Existing Inter-Domain Routing Approaches • OSPF+BGP4 • IP terminology • Hop-by-hop routing • traffic engineering is difficult when applying protection schemes • PNNI • very scalable solution • loss of important information (overaggregation)

  9. Our Solution • Topology aggregation supports • “Explicit” source routing • Sub-lambda connections • Resilience issues • Call control • Based on OIF specifications • Information • consistent • periodically flooded

  10. Topology discovery and RWA Problems: • Aggregated edges WL to WL (simple if ALL/NONE of the border nodes is WL converter) • Insufficient information about destination domain • Aggregation of other metrics

  11. Tests, Results • Hypotetical topology • Varied attributes: • traffic (Poisson(λ,ν)) • refresh intervals • maximal setup delay • Measured • Blocking ratio for inter-domain setups • Average setup delay

  12. Results Longer refresh periods cause higher blocking ratio Maximal setup delay time does not influence the blocking ratio significantly

  13. Conclusions • Topology aggregation in multilayer networks is not simple • Inter-domain routing based on stalled information: • Trade-off between flooding and accuracy • Information refresh period length has a roughly linear relation to the blocking ratio

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