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Please use this identifier to cite or link to this item: http://hdl.handle.net/123456789/5216

Title: Improvement of Link Failure Restoration Utilising Multi-Protocol Label Switching (MPLS) as a Means to Maintain Quality of Service (QoS)
Authors: Asante, M.
Sherratt, R.S.
Keywords: Convergence
Repair paths
Issue Date: Aug-2009
Publisher: Journal of Science and Technology
Citation: Journal of Science and Technology, Vol. 29 No. 2, 2009 pp 118-125
Abstract: This paper proposes a practical approach to the enhancement of Quality of Service (QoS) routing by means of providing alternative or repair paths in the event of a breakage of a working path. The proposed scheme guarantees that every Protected Node (PN) is connected to a multi-repair path such that no further failure or breakage of single or double repair paths can cause any simultaneous loss of connectivity between an ingress node and an egress node. Links to be protected in an MPLS network are predefined and a Label Switched path (LSP) request involves the establishment of a working path. The use of multi-protection paths permits the formation of numerous protection paths allowing greater flexibility. Our analysis examined several methods including single, double and multi-repair routes and the prioritization of signals along the protected paths to improve the Quality of Service (QoS), throughput, reduce the cost of the protection path placement, delay, congestion and collision. Results obtained indicated that creating multi-repair paths and prioritizing packets reduces delay and increases throughput in which case the delays at the ingress/egress LSPs were low compared to when the signals had not been classified. Therefore the proposed scheme provided a means to improve the QoS in path restoration in MPLS using available network resources. Prioritizing the packets in the data plane has revealed that the amount of traffic transmitted using a medium and low priority Label Switch Paths (LSPs) does not have any impact on the explicit rate of the high priority LSP in which case the problem of a knock-on effect is eliminated.
Description: Article published in the Journal of Science and Technology, Vol. 29 No. 2, 2009 pp 118-125
URI: http://hdl.handle.net/123456789/5216
Appears in Collections:Journal of Science and Technology 2000-

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