臺灣博碩士論文加值系統

Software Defined Networks (SDN) realized the separation of the control plane and data plane by centralizing all control logic into a server known as controller. SDN also gained popularity because of the ability to programmatically configure the network using open-source or proprietary applications installed on the controller.
Making SDN more ubiquitous requires SDN to accommodate any type of networks such as datacenter, enterprise, home, etc. Currently, the deployment of SDN in enterprise or home networks is challenging because the control and data traffic needs to flow in the same channel (in-band). This challenge is further complicated when the switches need to be discovered and configured (bootstrap) and establish a path to the controller via other switches in the network.
Current in-band bootstrapping approach describes a switch-initiated bootstrapping approach wherein the switches initiate the bootstrapping process and the DHCP server helps by providing IP addresses and controller information.
In this thesis, we propose “iBON: In-band Bootstrapping of OpenFlow Networks”, a controller-initiated fully automatic bootstrapping approach. iBON uses various protocols to automatically discover and configure the switches in a network. The protocols are handled by an agent installed on the OpenFlow switches and the agent establishes an in-band path to the controller once the switch is bootstrapped. The evaluation results show that the switches in various in-band topologies can be bootstrapped in reasonable time.

Software Defined Networks (SDN) realized the separation of the control plane and data plane by centralizing all control logic into a server known as controller. SDN also gained popularity because of the ability to programmatically configure the network using open-source or proprietary applications installed on the controller.
Making SDN more ubiquitous requires SDN to accommodate any type of networks such as datacenter, enterprise, home, etc. Currently, the deployment of SDN in enterprise or home networks is challenging because the control and data traffic needs to flow in the same channel (in-band). This challenge is further complicated when the switches need to be discovered and configured (bootstrap) and establish a path to the controller via other switches in the network.
Current in-band bootstrapping approach describes a switch-initiated bootstrapping approach wherein the switches initiate the bootstrapping process and the DHCP server helps by providing IP addresses and controller information.
In this thesis, we propose “iBON: In-band Bootstrapping of OpenFlow Networks”, a controller-initiated fully automatic bootstrapping approach. iBON uses various protocols to automatically discover and configure the switches in a network. The protocols are handled by an agent installed on the OpenFlow switches and the agent establishes an in-band path to the controller once the switch is bootstrapped. The evaluation results show that the switches in various in-band topologies can be bootstrapped in reasonable time.

Abstract ................................................ ii
Table of Contents ...................................... iii
Table of Figures ......................................... v
Table of Charts ......................................... vi
1. Introduction .......................................... 1
1.1 Motivation ........................................... 3
1.2 Objective ............................................ 3
1.3 Synopsis ............................................. 4
2. Background ............................................ 5
2.1 Software Defined Network (SDN)........................ 5
2.2 OpenFlow ............................................. 7
2.2.1 Flow Table ......................................... 8
2.2.2 OpenFlow Messages ................................. 10
2.3 Network Topology Discovery .......................... 11
2.4 OpenDaylight Platform ............................... 12
2.5 Device Discovery Protocol ........................... 13
3. Related Work ......................................... 16
3.1 Automatic bootstrapping of OpenFlow networks ........ 16
4. iBON: In-band Bootstrapping of OpenFlow Networks ..... 18
4.1 Underlying Idea ..................................... 18
4.2 Design Concept ...................................... 18
4.2.1 Automatic Bootstrapping ........................... 19
4.2.2 In-band control path creation ..................... 20
4.2.3 DHCP tree creation and rule installation .......... 20
4.3 Summary of iBON ..................................... 22
5. System Implementation ................................ 23
5.1 DDP CLI and DDP Northbound .......................... 24
5.2 DDP Service.......................................... 25
5.3 DDP Plugin .......................................... 26
5.4 DHCP Manager ........................................ 27
5.5 Bootstrap agent ..................................... 29
6. Experimental Evaluation .............................. 31
6.1 Linear Topology...................................... 32
6.2 Star Topology ....................................... 33
7. Conclusion and Future Work ........................... 34
7.1 Conclusion .......................................... 34
7.2 Future Work ......................................... 34
References .............................................. 35

[1] “SDN 101: An introduction to software-defined networking”, https://www.citrix.com/products/netscaler-adc/resources/sdn-101.html
[2] N. McKeown et al., “OpenFlow: enabling innovation in campus networks”, ACM SIGCOMM Computer Communication Review, Volume 38, Issue 2, Pages 69 – 74, 2008
[3] O. N. Foundation, “Software-defined networking: The new norm for networks”, ONF White Paper, 2012.
[4] “Control Plane in OpenFlow Networks”, http://blog.ipspace.net/2013/12/control-plane-in-openflow-networks.html
[5] “Software-Defined Networking (SDN) Definition”, https://www.opennetworking.org/sdn-resources/sdn-definition
[6] “Understanding the SDN Architecture”, https://www.sdxcentral.com/sdn/definitions/inside-sdn-architecture/
[7] Open Networking Foundation, “OpenFlow® Switch Specification Ver 1.0.0”, December, 2009
[8] S. Pandey et al., “SNMP-based enterprise IP network topology discovery”, International Journal of Network Management, Volume 21, Issue 3, Pages 169-184, 2011
[9] “OpenDaylight Platform”, https://www.opendaylight.org/
[10] “OpenDaylight, the Most Documented Controller”, http://thenewstack.io/sdn-series-part-vi-opendaylight/
[11] R. Droms, “Dynamic Host Configuration Protocol”, IETF, RFC 2131
[12] S. Sharma et al., “Automatic bootstrapping of OpenFlow networks”, 19th IEEE Land and Metropolitan Area Networks Symposium, 2013