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Bandwidth management is the process of measuring and controlling the communications (traffic, packets) on a network link, to avoid filling the link to capacity or overfilling the link, which would result in network congestion and poor performance of the network. Bandwidth is measured in bits per second (bit/s) or bytes per second (B/s).

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Bandwidth management mechanisms and techniquesEdit

Bandwidth management mechanisms may be used to further engineer performance and includes:

Link performanceEdit

Issues which may limit the performance of a given link include:

  • TCP determines the capacity of a connection by flooding it until packets start being dropped (Slow-start)
  • Queueing in routers results in higher latency and jitter as the network approaches (and occasionally exceeds) capacity
  • TCP global synchronization when the network reaches capacity results in waste of bandwidth
  • Burstiness of web traffic requires spare bandwidth to rapidly accommodate the bursty traffic
  • Lack of widespread support for explicit congestion notification and Quality of Service management on the Internet
  • Internet Service Providers typically retain control over queue management and quality of service at their end of the link
  • Window Shaping allows higher end products to reduce traffic flows, which reduce queue depth and allow more users to share more bandwidth fairly

Tools and techniquesEdit

See alsoEdit

SourcesEdit

  • "Deploying IP and MPLS QoS for Multiservice Networks: Theory and Practice" by John Evans, Clarence Filsfils (Morgan Kaufmann, 2007, ISBN 0-12-370549-5)

ReferencesEdit

External linksEdit