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Auto-bandwidth control in dynamically reconfigured hybrid-SDN MPLS networks
The proposition of this work is based on the steady evolution of bandwidth demanding technology, which currently and more so in future, requires operators to use expensive infrastructure capability smartly to maximise its use in a very competitive environment. In this thesis, a traffic engineering c...
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| Format: | Thesis |
| Language: | English |
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Department of Electrical Engineering
2021
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| _version_ | 1867613215266963457 |
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| access_status_str | Open Access |
| author | Brandt, Angus Daniel |
| author2 | Murgu, Alexandru |
| author_browse | Brandt, Angus Daniel Murgu, Alexandru |
| author_facet | Murgu, Alexandru Brandt, Angus Daniel |
| author_sort | Brandt, Angus Daniel |
| collection | Thesis |
| description | The proposition of this work is based on the steady evolution of bandwidth demanding technology, which currently and more so in future, requires operators to use expensive infrastructure capability smartly to maximise its use in a very competitive environment. In this thesis, a traffic engineering control loop is proposed that dynamically adjusts the bandwidth and route of flows of Multi-Protocol Label Switching (MPLS) tunnels in response to changes in traffic demand. Available bandwidth is shifted to where the demand is, and where the demand requirement has dropped, unused allocated bandwidth is returned to the network. An MPLS network enhanced with Software-defined Networking (SDN) features is implemented. The technology known as hybrid SDN combines the programmability features of SDN with the robust MPLS label switched path features along with traffic engineering enhancements introduced by routing protocols such as Border Gateway Patrol-Traffic Engineering (BGP-TE) and Open Shortest Path First-Traffic Engineering (OSPF-TE). The implemented mixed-integer linear programming formulation using the minimisation of maximum link utilisation and minimum link cost objective functions, combined with the programmability of the hybrid SDN network allows for source to destination demand fluctuations. A key driver to this research is the programmability of the MPLS network, enhanced by the contributions that the SDN controller technology introduced. The centralised view of the network provides the network state information needed to drive the mathematical modelling of the network. The path computation element further enables control of the label switched path's bandwidths, which is adjusted based on current demand and optimisation method used. The hose model is used to specify a range of traffic conditions. The most important benefit of the hose model is the flexibility that is allowed in how the traffic matrix can change if the aggregate traffic demand does not exceed the hose maximum bandwidth specification. To this end, reserved hose bandwidth can now be released to the core network to service demands from other sites. |
| format | Thesis |
| id | oai:open.uct.ac.za:11427/33432 |
| institution | University of Cape Town (South Africa) |
| language | eng |
| last_indexed | 2026-06-10T12:32:36.207Z |
| license_str | Not specified — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UCTD — University of Cape Town Open Access Repository |
| publishDate | 2021 |
| publishDateRange | 2021 |
| publishDateSort | 2021 |
| publisher | Department of Electrical Engineering |
| publisherStr | Department of Electrical Engineering |
| record_format | dspace |
| source_str | UCTD — University of Cape Town Open Access Repository |
| spelling | oai:open.uct.ac.za:11427/33432 Auto-bandwidth control in dynamically reconfigured hybrid-SDN MPLS networks Brandt, Angus Daniel Murgu, Alexandru Electrical Engineering The proposition of this work is based on the steady evolution of bandwidth demanding technology, which currently and more so in future, requires operators to use expensive infrastructure capability smartly to maximise its use in a very competitive environment. In this thesis, a traffic engineering control loop is proposed that dynamically adjusts the bandwidth and route of flows of Multi-Protocol Label Switching (MPLS) tunnels in response to changes in traffic demand. Available bandwidth is shifted to where the demand is, and where the demand requirement has dropped, unused allocated bandwidth is returned to the network. An MPLS network enhanced with Software-defined Networking (SDN) features is implemented. The technology known as hybrid SDN combines the programmability features of SDN with the robust MPLS label switched path features along with traffic engineering enhancements introduced by routing protocols such as Border Gateway Patrol-Traffic Engineering (BGP-TE) and Open Shortest Path First-Traffic Engineering (OSPF-TE). The implemented mixed-integer linear programming formulation using the minimisation of maximum link utilisation and minimum link cost objective functions, combined with the programmability of the hybrid SDN network allows for source to destination demand fluctuations. A key driver to this research is the programmability of the MPLS network, enhanced by the contributions that the SDN controller technology introduced. The centralised view of the network provides the network state information needed to drive the mathematical modelling of the network. The path computation element further enables control of the label switched path's bandwidths, which is adjusted based on current demand and optimisation method used. The hose model is used to specify a range of traffic conditions. The most important benefit of the hose model is the flexibility that is allowed in how the traffic matrix can change if the aggregate traffic demand does not exceed the hose maximum bandwidth specification. To this end, reserved hose bandwidth can now be released to the core network to service demands from other sites. 2021-07-07T10:28:52Z 2021-07-07T10:28:52Z 2021 2021-07-07T08:45:54Z Doctoral Thesis Doctoral PhD http://hdl.handle.net/11427/33432 eng application/pdf Department of Electrical Engineering Faculty of Engineering and the Built Environment |
| spellingShingle | Electrical Engineering Brandt, Angus Daniel Auto-bandwidth control in dynamically reconfigured hybrid-SDN MPLS networks |
| thesis_degree_str | Doctoral |
| title | Auto-bandwidth control in dynamically reconfigured hybrid-SDN MPLS networks |
| title_full | Auto-bandwidth control in dynamically reconfigured hybrid-SDN MPLS networks |
| title_fullStr | Auto-bandwidth control in dynamically reconfigured hybrid-SDN MPLS networks |
| title_full_unstemmed | Auto-bandwidth control in dynamically reconfigured hybrid-SDN MPLS networks |
| title_short | Auto-bandwidth control in dynamically reconfigured hybrid-SDN MPLS networks |
| title_sort | auto bandwidth control in dynamically reconfigured hybrid sdn mpls networks |
| topic | Electrical Engineering |
| url | http://hdl.handle.net/11427/33432 |
| work_keys_str_mv | AT brandtangusdaniel autobandwidthcontrolindynamicallyreconfiguredhybridsdnmplsnetworks |