Framework of Internet Traffic Engineering

1
Framework of Internet Traffic Engineering

• Yi Pan

2
Introduction and Background

• Definitions
• Traffic Engineering (Conventional process)
• Put the traffic to where the capacity is
• Short term operations
• First taken process
• Network Planning (Conventional process)
• Plan the network topology according to long term
  traffic prediction
• Long term operations
• Last taken process
• Network Engineering (New process)
• Put the capacity to where the traffic needs
• Near term operations
• Process taken after the failure of TE
• Requires configurable underlying circuit switched
  networks

3
Models

• Conventional Internet Engineering Model

Uninstalled Resource Pool
Traffic Data
Traffic Engineering (short-term)
Network Planning (Long-term)
Network with Resources in physical topology
TE is based on the fixed resource provided by the
underlying network
4
Models

• Limitations of the conventional model
• TE on the static resource network can not
  provides enough flexibility for changing traffic
• NP (Network Plan) is based on long term
  prediction, which may
• Not sufficient to support traffic when mismatch
  between the prediction and real traffic exists
• Over-provision resource causes low resource
  utilization ratio

5
Models

• New features of underlying transport network for
  IP network
• Configurable circuit switched networks is used as
  the transport network for IP networks
• IP links can be dynamically add, delete, or
  modified
• Leverage the dynamic nature of underlying
  transport topology is possible for IP networks

6
Models

• New Internet Engineering model

Uninstalled Resource Pool
Links from Provider Network
Traffic Data
Traffic Engineering (short-term)
Network Planning (Long-term)
Network Engineering (near-term)
Unresolved Traffic
Unresolved Traffic
User network with resources in logical topology
7
Models

• Functionality of each process module
• TE distributes traffic loads to optimal solution
  based on the current user IP network topology in
  real-time
• NE takes action to dynamically change the user IP
  networks logical topology when TE fails
• It adds new logical IP links or link connections
  when additional capacity is needed
• It deletes logical IP links or link connections
  when link capacity is not used
• Finally, NP takes action if both of previous
  processes fail
• New physical capacity and topology changes will
  be added
• Useless physical links will be deleted

8
Models

• Network Engineering
• Why enable more flexibility by providing
  configurable logical IP network topology for
  traditional TE process
• What An automatic network provisioning procedure
  to allocate/de-allocate provider networks
  resource to be used by the user IP network
• How new control plane in circuit switched
  network provides the mechanism to set up,
  release, and modify the IP links and link
  capacity
• When it monitors the network and a set of
  triggers can be used to decide when to trigger
  the NE process
• Where select possible existing resources from
  the providers network to satisfy the traffic
  demand with respect to reducing the overall cost

9
Models

• Architectural elements of NE process

IP traffic information
Operations (IP logical link configuration)
IP Network Engineering (decision making)
IP topology information
10
Models

• A close loop model for NE and TE

The state of the user network
Topology triggers
Topology traffic updates
Route updates
Traffic Problem
Traffic Engineering (short-term)
Network Engineering (near-term)
Topology discovery
User network
Provider network
Operation Requests
Operations
The state of the provider network
11
Models

• In the above model
• TE mainly decides when to use NE process
• NE computes where to change the topology