Diseño de una red en OSPF

Tesis (Maestro en Ciencias de la Ingeniería con Especialidad en Telecomunicaciones) - Universidad Autónoma de Nuevo León, 2003

Análisis y estudio de OSPF como protocolo de enrutamiento interno de una red corporativa

El objetivo del proyecto consiste en analizar OSPF como protocolo de enrutamiento interno para una red corporativa, primero desde un punto de vista teórico viendo sus características y funcionamiento para posteriormente usarlo en el diseño e implementación de un protocolo de enrutamiento en una empresa, simulando una situación real. Ésto nos permitirá conocer OSPF mostrando características, funcionamiento y aplicabilidad del mismo con el fin de aportar al Ingeniero la suficiente información como para poder tomar la decisión de que protocolo de enrutamiento usar en una red corporativa bajo determinados requisitos y limitaciones.

Comparison of single and multi-objective evolutionary algorithms for robust link-state routing

Traffic Engineering (TE) approaches are increasingly impor- tant in network management to allow an optimized configuration and resource allocation. In link-state routing, the task of setting appropriate weights to the links is both an important and a challenging optimization task. A number of different approaches has been put forward towards this aim, including the successful use of Evolutionary Algorithms (EAs). In this context, this work addresses the evaluation of three distinct EAs, a single and two multi-objective EAs, in two tasks related to weight setting optimization towards optimal intra-domain routing, knowing the network topology and aggregated traffic demands and seeking to mini- mize network congestion. In both tasks, the optimization considers sce- narios where there is a dynamic alteration in the state of the system, in the first considering changes in the traffic demand matrices and in the latter considering the possibility of link failures. The methods will, thus, need to simultaneously optimize for both conditions, the normal and the altered one, following a preventive TE approach towards robust configurations. Since this can be formulated as a bi-objective function, the use of multi-objective EAs, such as SPEA2 and NSGA-II, came nat- urally, being those compared to a single-objective EA. The results show a remarkable behavior of NSGA-II in all proposed tasks scaling well for harder instances, and thus presenting itself as the most promising option for TE in these scenarios.

Automated network resilience optimization using computational intelligence methods

This paper presents an automated optimization framework able to provide network administrators with resilient routing configurations for link-state protocols, such as OSPF or IS-IS. In order to deal with the formulated NP-hard optimization problems, the devised framework is underpinned by the use of computational in- telligence optimization engines, such as Multi-objective Evolutionary Algorithms (MOEAs). With the objective of demonstrating the framework capabilities, two il- lustrative Traffic Engineering methods are described, allowing to attain routing con- figurations robust to changes in the traffic demands and maintaining the network stable even in the presence of link failure events. The presented illustrative results clearly corroborate the usefulness of the proposed automated framework along with the devised optimization methods.

Automated network resilience optimization using computational intelligence methods

This paper presents an automated optimization framework able to provide network administrators with resilient routing configurations for link-state protocols, such as OSPF or IS-IS. In order to deal with the formulated NP-hard optimization problems, the devised framework is underpinned by the use of computational intelligence optimization engines, such as Multi-objective Evolutionary Algorithms (MOEAs). With the objective of demonstrating the framework capabilities, two illustrative Traffic Engineering methods are described, allowing to attain routing configurations robust to changes in the traffic demands and maintaining the network stable even in the presence of link failure events. The presented illustrative results clearly corroborate the usefulness of the proposed automated framework along with the devised optimization methods.

Sperimentazione di protocolli di routing ip su piattaforme raspberry pi.

Tesi mirata allo studio dei protocolli di routing IP utilizzati per l'inoltro dei pacchetti in una topologia non banale. Sono state utilizzate macchine Linux Raspberry Pi per il loro costo e ingombro per costruire la rete. In particolare, è stata implementata una rete caratterizzata da sette router divisi in tre aree distinte, ai quali sono state connesse sette LAN. Si è installato e utilizzato il software quagga per attivare il protocollo OSPF (Open Shortest Path First). Per limitare i dispositivi fisici si è utilizzato il software Mininet per virtualizzare switch e LAN. Infine, sono stati trattati elementi teorici del routing su Internet, applicati alla rete creata per verificarne il funzionamento.

Sperimentazione di protocolli di routing su topologie di rete ibride

In questa tesi si è voluto interfacciare dispositivi di nuova generazione (Raspberry Pi), presenti in una topologia di rete già implementata, con dispositivi di vecchia generazione, come Router Cisco e Switch HP. Questi ultimi sono dispositivi fisici, mentre i Raspberry, tramite tool mininet e altre impostazioni, possono generare dispositivi virtuali. Si è quindi applicato un interfacciamento tra le due tipologie di apparati, creando una rete nuova, e adatta come caso a ricoprire le reti attuali, siccome questo è un esempio di come con poche modifiche si può intervenire su qualsiasi rete già operativa. Si sono quindi osservati i criteri generali su cui operano sia i router, che gli switch, e si sono osservati come questi interagiscono con un flusso di dati attraverso vari protocolli, alcuni rifacenti al modello ISO/OSI, altri all'OSPF.