Dynamic Service Provisioning in Converged Network Infrastructure

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
Service Intelligence
Customer3
Customer4
Customer1
Customer5
Customer2
E-mail
Hosting
Local
ERP
Internet Access
Long Dist
Data
Voice
IP
L2 Services
Fast Ethernet
CT3
POS
Gigabit Ethernet
ATM
TDM
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
Application Driven Provisioning
Insufficient Bandwidth Must Dilate Pipe
Application
The Network
14
Tunable Optical Scaling
Insufficient Bandwidth at the SONET Layer
Splits the Network Into two Logical Rings
Application
The Network
15
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