Interdomain traffic engineering (TE) controls the flow of traffic
between autonomous systems (ASes) to achieve performance goals under
various resource constraints. Interdomain TE can be categorized
into ingress TE and egress TE, which aim to control the ingress and
egress traffic flow in a network, respectively. Most interdomain TE
techniques are based on BGP, which was not designed to support
performance based routing. Hence even though some basic interdomain
TE techniques are widely deployed, their overall effectiveness and
impact on interdomain traffic are not well understood. Furthermore,
systematic practices for deploying these techniques have yet to be
developed.
In this thesis, we explore these open issues for both ingress and
egress TE. We first focus on the AS-Path prepending technique in
interdomain ingress TE. We design a polynomial algorithm that
takes network settings as input and produces the optimal prepending
at each ingress link. We also develop methods to measure the inputs
of the optimal algorithm by leveraging widely available looking
glass severs and evaluate the errors of such measurement. We
further propose an algorithm, based on this optimal algorithm, that
is robust to input errors.
We then focus on Intelligent Routing Control (IRC) systems often
used at multihomed networks for egress interdomain TE. To address
the possible traffic oscillation problem caused by multiple IRC
systems, we design a class of randomized IRC algorithms. Through
simulations, we show that the proposed algorithms can effectively
mitigate oscillations. We also show that IRC systems using
randomized path switching algorithms perform better than those
switching path deterministically, when both types of IRC systems
co-exist.
To further understand the performance impact of IRC systems, we next
focus on the performance of applications, such as TCP
connections. We study the synergistic and antagonistic
interactions between IRC and TCP connections, through a simple
dual-feedback model. We first examine the impact of sudden RTT and
available bandwidth changes in TCP connection. We then examine the
effect of IRC measurement delays on closed loop traffic. We also
show the conditions under which IRC is beneficial under various path
impairment models.
| Identifer | oai:union.ndltd.org:GATECH/oai:smartech.gatech.edu:1853/19732 |
| Date | 24 August 2007 |
| Creators | Gao, Ruomei |
| Publisher | Georgia Institute of Technology |
| Source Sets | Georgia Tech Electronic Thesis and Dissertation Archive |
| Detected Language | English |
| Type | Dissertation |
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