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Title: Efficient recovery mechanisms over IGP and MANET networks
Author: Abujassar, Radwan Saoud
ISNI:       0000 0004 2727 2380
Awarding Body: University of Essex
Current Institution: University of Essex
Date of Award: 2012
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Routing protocols form an important key component in Mobile Ad-hoc Network (MANET) and Interior Gateway Protocol (IGP) networks, where every node (router) computes a shortest path to every other destination node, so the service can be delivered through this shortest path in a short time. Hence, failures in the shortest path lead to the degradation of network performance by increasing packet loss and delays in the demanded traffic. An incident of failure in the network is time-demanding to recover through routing protocol, as this necessitates re-constructing the routing table for the network topology and computing a new shortest path. During this process, delays in shortest path computations between some routers lead to the formation of routing loops, in which traffic circulates between two or more nodes many times before the routers construct an updated shortest path tree. When local loops occur in the network, the circulated traffic can increase link utilisation, create congestion, and affect other traffic passing along paths which also form a part of the loop. In this thesis, the performance implications of link or node failures in IGP and MANET networks are studied in detail. Several recovery mechanisms are proposed to reduce the impact of failure and guarantee a loop-free in the network. These mechanisms seek to reduce recovery time, which remains undesirably long in the current routing protocols in wired and wireless networks. The research was further extended to develop a recovery mechanism in MANET network to alleviate the impact of the frequent loss of connection due to the flexibility of free nodes, which move from one area to another without pre-notification. The idea behind recovery mechanism is to reduce current recovery time by constructing an alternative backup path in advance between source and destination, and then to reroute the traffic via this backup path when failure occurs.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available