Bandwidth management

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,[1] which would result in network congestion and poor performance of the network. Bandwidth is described by bit rate and measured in units of bits per second (bit/s) or bytes per second (B/s).[2]

Bandwidth management mechanisms and techniques

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

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 techniques

See also

References

  1. https://www.internetsociety.org/wp-content/uploads/2017/08/BWroundtable_report-1.0.pdf Internet Society on Bandwidth Management
  2. "Bits Per Second". www.edrm.net. Retrieved 2020-07-23.
  3. IETF RFC 2475 "An Architecture for Differentiated Services" section 2.3.3.3 - Internet standard definition of "Shaper"
  4. AppNeta. "Rate Limiting Detection: Bandwidth and Latency". Appneta. Retrieved 2020-07-23.
  5. "TCP Rate Control" (PDF).
  6. Handley, Mark; Padhye, Jitendra; Floyd, Sally; Widmer, Joerg (2008). "TCP Friendly Rate Control (TFRC): Protocol Specification". tools.ietf.org. doi:10.17487/RFC5348. Retrieved 2020-07-23.
  7. Stiliadis, D.; Varma, A. (1998). "Latency-rate servers: A general model for analysis of traffic scheduling algorithms" (PDF). IEEE/ACM Transactions on Networking. 6 (5): 611. doi:10.1109/90.731196. S2CID 206475858. Archived from the original (PDF) on 2016-03-04. Retrieved 2020-07-23.
  8. "Traffic Shaping and Policing" (PDF).
  9. "Buffer Tuning" (PDF).
  10. Sonia Fahmy; Raj Jain (2000). "Resource ReSerVation Protocol (RSVP)" (PDF). In Rafael Osso (ed.). Handbook of Emerging Communications Technologies: The Next Decade. CRC Press. S2CID 18245741 via Washington University in St. Louis.
  11. "Sniffers Basics and Detection" (PDF).
  • "Deploying IP and MPLS QoS for Multiservice Networks: Theory and Practice" by John Evans, Clarence Filsfils (Morgan Kaufmann, 2007, ISBN 0-12-370549-5)
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