Traffic Engineering in IP Networks

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Traffic Engineering in IP Networks
Presented by Senthil Rajasekharan and Ajay
Wanchoo
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TE - What and Why its needed ?
What is TE ?

• Traffic Engineering - mechanisms for optimizing
  operational networks.
• Also a process of efficiently mapping traffic
  demand onto the network.

Why we need TE ?

• Improved efficiency value of network resources.
• Achieve specific performance objectives
  (quantitative).

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Traffic Engineering Concepts

• TE is essentially a control problem - closed
  loop system consisting of a demand
  system(traffic), a response system (interconnects
  or switches and routers) and a response system
  (network protocols and processes).
• Stages in the TE process model
• Policy formulation (network context, cost
  structure etc.,)
• Monitoring network state (performance monitors,
  fault monitors etc.,)
• Characterization of monitored traffic
• Performance optimization ( augmenting resources,
  adjusting routing parameters etc.,)

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Traffic Engineering Objectives

• TE performance objectives can be Traffic
  Oriented or Resource Oriented.
• Minimize congestion in the core
• Reliability and Survivability
• Meet multiclass service requirements.

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Traffic Engineering Components
The Traffic Engineering model consists of the
following components

• Path Selection Placement (RSVP or CR-LDP)
• Traffic Assignment
• Topology Updates
• Network Management

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Traffic Engineering Example and IP Evolution

• Traditional IGP sends packets from C to E over
  the Shortest Path, results in congestion and
  inefficient network usage if all the packets
  follow path C-D-E.
• In a Traffic Engineered networks a fraction of
  the packets can be easily routed along path
  C-F-G-E.

IP
IP MPLS
ATM
IP MPLS
Adaptation Layer
SONET
SONET
Optical Transport Network
Fiber
DWDM
Evolution in Time