E-CER: Abordagem para Desviar Pacotes na Presença de Falha em Backbones IP com OSPF (E-CER: Recovery Paths to Deviate Packets During a Failure in IP Backbones with OSPF)

Fernando Barreto (fbarreto@utfpr.edu.br), Emílio C. G. Wille (ewille@utfpr.edu.br), Luiz Nacamura (nacamura@utfpr.edu.br)


Universidade Tecnológica Federal do Paraná
This paper appears in: Revista IEEE América Latina

Publication Date: Dec. 2009
Volume: 7,   Issue: 6 
ISSN: 1548-0992


Abstract:
IP network backbones use link state routing protocols to find correct routes. In face of a link state change, e.g. a failure, these protocols need some time to react to it in order to find new routes. During this time, the routes become unstable, causing high packet loss rate and depreciation of backbone reliability. This work presents a proactive approach named E-CER to help the IP routing protocols during the convergence period in order to reduce packet loss rate. The approach is evaluated using various artificial and real topologies, and a simulation is also implemented in order to evaluate the packet loss rate reduction, which yielded satisfactory results.

Index Terms:
IP fast rerouting, reliability, OSPF, fault tolerance   


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