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Dynamic Service Provisioning Challenges in Converged Network Infrastructure

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mallory-daniels
17 diapositives · 317 Views · Nov 16, 2014

This document explores the complexities of dynamic service provisioning within converged network infrastructure. It highlights trends in convergence, cost savings, and examples like SONET, IP, and DWDM. The discussion includes the distinction between physical and logical layer convergence, integration challenges, and the ongoing use of multiple protocols. Key areas include QoS objectives, service provisioning and management, and the evolving role of service providers. It emphasizes the necessity for efficient resource mapping, signaling mechanisms, and dynamic adaptation to network changes.

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  1. Dynamic Service Provisioning in Converged Network Infrastructure Muckai Girish Atoga Systems

  2. Network Architecture • Convergence is the trend • Cost savings from equipment and operations • Example: SONET, IP and DWDM • Physical network layer convergence vs logical layer convergence • Multiple protocols still used for various purposes • Tight integration among the layers is challenging and is typically the missing piece

  3. Network Architecture Challenges • Pockets/segments with miscellaneous network architectures and overlays • Mappings and co-ordination among the layers and between networks are quite cumbersome • Technology & protocol mappings • QoS mappings • Network management • Time/reason/cost/inertia to migrate networks • Product and solution evolution, stability, standardization processes and market acceptance • Type of service provider: greenfield, incumbent • Economic and business factors lead to the final answer

  4. Services • Applications demand multiple service grades • Gaining importance • End-to-end • Differing network treatments • Different optimization criteria • Significant technology improvements

  5. Customers Application Services L3 Services Service Intelligence Customer3 Customer4 Customer1 Customer2 Customer5 E-mail Hosting Local Internet Access Long Dist ERP Data Voice IP L2 Services POS ATM CT3 TDM Fast Ethernet Gigabit Ethernet SONET Framing SONET SONET SONET SONET SONET SONET WDM WDM WDM WDM WDM WDM WDM Services Service Lambdas

  6. Service Providers’ QoS Objectives • Provide a wide spectrum of QoS with SLA to meet the needs of various services and applications • Support connection-based QoS • with stringent end-to-end guarantee on loss ratio, transfer delay, and delay jitter • with minimum QoS requirement and can exploit additional network resources • Support connectionless QoS • differentiated services with multiple levels of drop precedence • best-effort service

  7. Challenges • How to provide services in a converged network infrastructure ? • Protocols • Tight integration between network layers • Network resource optimization • Translate the services’ requirements into the network parameters and protocol attributes • Ability to dynamically adapt to demand and network topology changes

  8. Dynamic Services • Topology and network architecture • Protocols • Signaling mechanisms • Protection mechanisms • Scaling and optimization

  9. Dynamic Services • Routing protocols for network reachability and topology discovery • Layer 2.x mechanism for traffic engineering and QoS/tunneling • SONET/Ethernet/other for framing • DWDM for optical scaling

  10. GMPLS • GMPLS is slated to be one of the unifying protocols for packet (IP), circuit (SONET/TDM) and optical (DWDM) technologies • For example • Data plane: MPLS for IP layer traffic engineering, QoS and tunneling (VPN) • Control plane: MPS for establishment of lightpaths • Protection and Restoration: at the MPLS layer

  11. Dynamic Services • Services can be provisioned in a hierarchical fashion • IP layer bandwidth • SONET/transport layer bandwidth • WDM bandwidth

  12. Tunable Optical Scaling • Tunable lasers • Emerging technology • Ability to tune to any wavelength from a finite set • Enables the creation of multiple logical groups in a physical topology • Enables optical scaling by moving a node from one logical group to another

  13. Data Packets SONET Layer Application Driven Provisioning Insufficient Bandwidth Must Dilate Pipe Application The Network

  14. OC48 Data Packets OC48 WDM Layer Tunable Optical Scaling Insufficient Bandwidth at the SONET Layer Splits the Network Into two Logical Rings Application The Network

  15. Data Packets WDM Layer Tunable Reprovisioning Splits the Network Into two Logical Rings Switches Node to the Other Logical Ring Application The Network

  16. Protection Mechanisms • Converged networks offer choices in protection layers • WDM layer (Proprietary protection mechanisms) • SONET layer (UPSR, BLSR) • Layer 2 (e.g., RPR) • MPLS layer • Challenges include service aware survivability

  17. Conclusion • New methods for dynamic service provisioning and scaling in converged network infrastructure • Provides service guarantees for existing and new applications • Makes use of converged network architecture • Tight integration between network layers