Traffic engineering with traditional IP routing protocols
Bernard Fortz, Jennifer Rexford and Mikkel Thorup
Traffic engineering involves adapting the routing of traffic to the
network conditions, with the joint goals of good user performance and
efficient use of network resources. In this paper, we describe an
approach to intradomain traffic engineering that works within the
existing deployed base of Interior Gateway Protocols (IGPs), such as
Open Shortest Path First (OSPF) and Intermediate System-Intermediate
System (IS-IS). We explain how to adapt the configuration of link
weights, based on a network-wide view of the traffic and topology
within a domain. In addition, we summarize the results of several
studies of techniques for optimizing OSPF/IS-IS weights to the
prevailing traffic. The paper argues that conventional IGPs are
surprisingly effective for engineering the flow of traffic in large IP
Published in IEEE Communications Magazine, 40(10), 2002.
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