University of Twente Student Theses


Last-mile lightpath services : on packet-switched shared infrastructure

Biesbroek, Rudolf (2014) Last-mile lightpath services : on packet-switched shared infrastructure.

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Abstract:Lightpath services offer a great incentive for data-intensive scientific research and are widely used within and across NREN networks. Extending dynamic lightpaths into the last-mile in a flexible manner with very low provisioning time is the holy grail to achieve, since this would truly serve the end-user. However, the uptake of dynamic lightpaths in last-mile networks is low and a generic solution does not exist. This empirical study investigates the possibilities to extend lightpaths on existing last-mile infrastructure. An experimental setup is used to examine the transmission characteristics when lightpaths are provided over an existing packet-switched last-mile infrastructure, and the consequences for the routed traffic. The results revealed that in the absence of other traffic, no significant difference between the physical dedicated lightpath and the packet-switched lightpath regard- ing transmission characteristics is observed. However, under congested conditions a best-effort packet-switched shared infrastructure cannot prevent lightpath traffic from gaining a large part of the resources, thereby suppressing existing background traffic or vice versa. The study also revealed that using strict priority scheduling with traffic policing enables lightpath traffic to experience network performance as if no other network traffic exists, while limiting interference with existing background traffic. It can be concluded that QoS enabled network devices are able to provide lightpath connectivity on last-mile packet-switched shared infrastructures. Moreover, to improve network utilization, a Network Resource Manager (NRM) could be used. This study provides insight into the feasibility to provide lightpath connectivity into the last mile and serve as basis for future studies. Moreover, the findings may support the decision making process to implement dynamic lightpath services in last-mile networks on existing infrastructures.
Item Type:Essay (Master)
Faculty:EEMCS: Electrical Engineering, Mathematics and Computer Science
Subject:54 computer science
Programme:Internet Science and Technology MSc (60032)
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