Interactions of intelligent route control with TCP congestion control

Authors:
Ruomei Gao;Dana Blair;Constantine Dovrolis;Monique Morrow;Ellen Zegura
Affiliations:
College of Computing, Georgia Institute of Technology;Cisco Systems Inc.;College of Computing, Georgia Institute of Technology;Cisco Systems Inc.;College of Computing, Georgia Institute of Technology
Venue:
NETWORKING'07 Proceedings of the 6th international IFIP-TC6 conference on Ad Hoc and sensor networks, wireless networks, next generation internet
Year:
2007

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Abstract

Intelligent Route Control (IRC) technologies allow multihomed networks to dynamically select egress links based on performance measurements. TCP congestion control, on the other hand, dynamically adjusts the send-window of a connection based on the current path's available bandwidth. Little is known about the complex interactions between IRC and TCP congestion control. In this paper, we consider a simple dual-feedback model in which both controllers react to packet losses, either by switching to a better path (IRC) or by reducing the offered load (TCP congestion control). We first explain that the IRC-TCP interactions can be synergistic as long as IRC operates on larger timescales than TCP ("separation of timescales"). We then examine the impact of sudden RTT changes on TCP, the behavior of congestion control upon path changes, the effect of IRC measurement delays, and the conditions under which IRC is beneficial under two path impairment models: short-term outages and random packet losses.