Abstract
TCP traffic that enters an IP network that supports Differentiated Services, is policed packet by packet. The border router marks differently those packets that are conforming to the Commited Information Rate (CIR) and those that are in excess and, therefore, non-conforming. The latter packets have a higher probability of being dropped in the buffers both of the border router and of the core router. This behavior has an implication when TCP sources are present. The TCP congestion control mechanism adapts the source rate to a speed that depends on the packet drop probability; therefore, in case of congestion, not only the excess traffic is dropped, but the TCP source is made to work at a speed that is even lower than the contracted CIR. In this paper, we propose a mechanism capable of controlling the amount of excess traffic that is allowed to enter the DiffServ network in a way that, even in case of congestion, the TCP throughput is not lower than the CIR.
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References
Nichols, K., Blacke, S., Backer, F., Black, D.: Definition of the Differentiated Services Field (DiffServ Field) in the IPv4 and IPv6 Headers. RFC 2474 (December 1998)
Grossman, D.: New Terminology and Clarifications for Diffserv. RFC 3260 (April 2002)
Blake, S., Black, D., Carlson, M., Davies, E., Wang, Z., Weiss, W.: An Architecture for Differentiated Services. RFC 2475 (December 1998)
Brim, S., Carpenter, B., Le Faucheur, F.: Per Hop Behavior Identification Codes. RFC 3140 (June 2001)
Davie, B., Charny, A., Bennet, J.C.R., et al.: An Expedited Forwarding PHB. RFC 3246 (March 2002)
Heinanen, J., Baker, F., Weiss, W., Wroclawski, J.: Assured Forwarding PHB Group. RFC 2597 (June 1999)
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Giacomazzi, P., Musumeci, L., Verticale, G.: Transport of TCP/IP Traffic over Assured Forwarding IP Differentiated Services. IEEE Network 17(5), 18–28 (2003)
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© 2005 Springer-Verlag Berlin Heidelberg
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Giacomazzi, P., Musumeci, L., Verticale, G. (2005). Management of Non-conformant TCP Traffic in IP DiffServ Networks. In: Ajmone Marsan, M., Bianchi, G., Listanti, M., Meo, M. (eds) Quality of Service in Multiservice IP Networks. QoS-IP 2004. Lecture Notes in Computer Science, vol 3375. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-30573-6_19
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DOI: https://doi.org/10.1007/978-3-540-30573-6_19
Publisher Name: Springer, Berlin, Heidelberg
Print ISBN: 978-3-540-24557-5
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