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

February 19, 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

February 19, 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

February 19, Services Applications demand multiple service grades –Gaining importance –End-to-end –Differing network treatments –Different optimization criteria –Significant technology improvements

February 19, Service Intelligence Data Customer1 Customer3Customer4 Customer5Customer2 IP ERP Internet Access HostingLocal Long Dist L3 Services Customers Application Services Application Services SONET WDM SONET WDM Fast Ethernet CT3POS Gigabit Ethernet ATM L2 Services Service Lambdas SONET Framing WDM Services WDM SONET Voice TDM

February 19, 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

February 19, 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

February 19, Dynamic Services Topology and network architecture Protocols Signaling mechanisms Protection mechanisms Scaling and optimization

February 19, 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

February 19, 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

February 19, Dynamic Services Services can be provisioned in a hierarchical fashion –IP layer bandwidth –SONET/transport layer bandwidth –WDM bandwidth

February 19, 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

February 19, The Network Application Driven Provisioning Application Insufficient Bandwidth Must Dilate Pipe Insufficient Bandwidth Must Dilate Pipe Data Packets SONET Layer

February 19, Tunable Optical Scaling The Network Application Data Packets WDM Layer Insufficient Bandwidth at the SONET Layer Insufficient Bandwidth at the SONET Layer OC48 Splits the Network Into two Logical Rings Splits the Network Into two Logical Rings

February 19, Splits the Network Into two Logical Rings Splits the Network Into two Logical Rings Tunable Reprovisioning The Network Application Data Packets WDM Layer Switches Node to the Other Logical Ring

February 19, 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

February 19, 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