Publication No 40060

Author(s)

Kühlewind, M.*; Scharf, M.*

Title

Implementation and Performance Evaluation of the re-ECN Protocol

Keywords

CONGESTION CONTROL; FAIRNESS; TCP/IP; NETWORK ARCHITECTURE; TRANSPORT PROTOCOL

Abstract

Re-inserted ECN (re-ECN) is a proposed TCP/IP extension that informs the routers on a path about the estimated level of congestion. The re-ECN protocol extends the Explicit Congestion Noti?cation (ECN) mechanism and reinserts the obtained feedback into the network. This exposure of congestion information is a new economic tra?c management mechanism that enables the network to share the available capacity more equally and to police the compliance of congestion control through e. g. a per-user congestion limitation. This paper studies performance implications of the re-ECN mechanism. Our evaluation is based on simulations with an own re-ECN implementation in the Linux TCP/IP stack. Our results also con?rm that congestion exposure generally works. But we also show that traffic characteristics such as the round-trip time (RTT), ?ow sizes, as well as the selection of congestion control algorithms have a signi?cant impact on the congestion exposure information. These non-trivial effects have to be taken into account when using the re-ECN information as input parameter for congestion control mechanisms in end-systems or for routing/policing inside the network. Comparable results have not been published so far.

Year

2010

Reference entry

Kühlewind, M.; Scharf, M.
Implementation and Performance Evaluation of the re-ECN Protocol
3rd Workshop on Economic Traffic Management (ETM 2010), Amsterdam, September 2010, pp. 39-50

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