Thesis (MSc)--Stellenbosch University, 2003. / ENGLISH ABSTRACT: The Internet has experienced tremendous growth in the last three decades and has emerged as a
platform to carryall forms of communications including voice, video and data. Along with this
growth came the urgency for quality of service (QoS) controls in IP networks as different types of
traffics have different service requirements. Although the IP protocol is able to scale to very large
networks, it does not provide sufficient functionality for traffic engineering in order to enable QoS
control.
Multi-protocol label switching (MPLS) is a new routing technology that enhances IP with some
QoS concepts from ATM and uses relatively simple packet forwarding mechanisms. MPLS has the
ability to perform traffic engineering and QoS control by routing traffic flowson virtual connections
called label switched paths (LSPs) which are assigned capacity.
A large portion of the traffic carried on the Internet consists of data traffic in the form of TCP
traffic. This thesis investigates several TCP models to find the ones most suitable to represent
TCP traffic in MPLS networks. The models consist of three types. The first type models a single
TCP source and the second type models a fixed number of TCP sources. The third type models
an infinite number of TCP sources. The models were evaluated by comparing their throughput
predictions and results obtained from simulation experiments that were done with the widely-used
simulator ns. We also present a simple derivation of the 1/,;e law for the TCP congestion window
size where e is the packet loss probability. / AFRIKAANSE OPSOMMING:In die afgelope drie dekades het die Internet beduidende groei ervaar, soveel so dat dit ontluik het
as 'n medium om alle tipes van moderne kommunikasies te hanteer insluitend telefoon, video en
data. Hierdie groei het gepaard gegaan met die behoefte na diensvlak (QoS) meganismes in IP
netwerke aangesien verskillende tipe kommunikasies verskillende diens vereistes het. Alhoewel die
IP protokol skalleerbaar is tot baie groot netwerke, voorsien dit nie voldoende funksionaliteit om
QoS beheer toe te pas nie.
"Multi-protocol label switching" (MPLS) is 'n nuwe roeterings tegnologie wat IP aanvul met QoS
konsepte van ATM en dit maak gebruik van relatief eenvoudige pakkie versendings-meganismes.
MPLS het die vermoe om netwerk-verkeer reeling en QoS beheer toe te pas deur verkeers-strome
te roeteer op virtuele roetes genaamd "label switched paths" (LSPs) aan wie kapasiteit toegeken
is.
'n Beduidende gedeelte van Internet-verkeer bestaan uit TCP-verkeer. Hierdie tesis ondersoek
verskillende modelle van TCP om die te vind wat die mees geskik is om TCP verkeer in MPLS
netwerke te verteenwoordig. Drie tipes modelle is ondersoek. Die eerste tipe moduleer 'n enkele
TCP verkeersbron en die tweede tipe moduleer 'n vasgestelde aantal TCP verkeersbronne. Die
derde tipe moduleer 'n oneindige aantal verkeersbronne. Die modelle is geevalueer deur hul voorspellings
van die tempo van data transmissie te vergelyk met resultate van simulasies. Die simulasies
is gedoen met die veelgebruikte simulator ns. Hierdie tesis bevat ook 'n eenvoudige afleiding
vir die 1/,;e wet vir die TCP oorlading venster grootte met e die verlies waarskeinlikheid van 'n
netwerk pakkie.
| Identifer | oai:union.ndltd.org:netd.ac.za/oai:union.ndltd.org:sun/oai:scholar.sun.ac.za:10019.1/53658 |
| Date | 04 1900 |
| Creators | Villet, Marcel |
| Contributors | Krzesinski, A. E., Stellenbosch University. Faculty of Science. Dept. of Mathematical Sciences. Computer Science. |
| Publisher | Stellenbosch : Stellenbosch University |
| Source Sets | South African National ETD Portal |
| Language | en_ZA |
| Detected Language | English |
| Type | Thesis |
| Format | 108 p : ill. |
| Rights | Stellenbosch University |
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