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Traffic Engineering Overview
The task of mapping
traffic flows onto an existing physical topology is called traffic engineering. Traffic engineering provides the
ability to move traffic flow away from the shortest path selected
by the interior gateway protocol (IGP) and onto a potentially less
congested physical path across a network.
Traffic engineering provides the capabilities to
do the following:
- Route primary paths around known bottlenecks or points
of congestion in the network.
- Provide precise control over how traffic is rerouted when
the primary path is faced with single or multiple failures.
- Provide more efficient use of available aggregate bandwidth
and long-haul fiber by ensuring that subsets of the network do not
become overutilized while other subsets of the network along potential
alternate paths are underutilized.
- Maximize operational efficiency.
- Enhance the traffic-oriented performance characteristics
of the network by minimizing packet loss, minimizing prolonged periods
of congestion, and maximizing throughput.
- Enhance statistically bound performance characteristics
of the network (such as loss ratio, delay variation, and transfer
delay) required to support a multiservices Internet.
This chapter discusses the following topics:
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