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

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dynamic service provisioning in converged network infrastructure muckai girish atoga systems
Dynamic Service Provisioning in Converged Network Infrastructure

Muckai Girish

Atoga Systems

network architecture
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
network architecture challenges
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
services
Services
  • Applications demand multiple service grades
    • Gaining importance
    • End-to-end
    • Differing network treatments
    • Different optimization criteria
    • Significant technology improvements
service intelligence

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

service providers qos objectives
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
challenges
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
dynamic services
Dynamic Services
  • Topology and network architecture
  • Protocols
  • Signaling mechanisms
  • Protection mechanisms
  • Scaling and optimization
dynamic services1
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
gmpls
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
dynamic services2
Dynamic Services
  • Services can be provisioned in a hierarchical fashion
    • IP layer bandwidth
    • SONET/transport layer bandwidth
    • WDM bandwidth
tunable optical scaling
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
application driven provisioning

Data Packets

SONET Layer

Application Driven Provisioning

Insufficient Bandwidth

Must Dilate Pipe

Application

The Network

tunable optical scaling1

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

tunable reprovisioning

Data Packets

WDM Layer

Tunable Reprovisioning

Splits the Network

Into two Logical Rings

Switches Node to the Other Logical Ring

Application

The Network

protection mechanisms
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
conclusion
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