Browsing by Author "Tsai, I-Chen"

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ERIC: Economical & Reconfigurable HybrId-band Control for Software-Defined Datacenter Network
(2016)
Suo, Cheng
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Tsai, I-Chen
;
Wen, Charles H. -P.
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電機學院
;
College of Electrical and Computer Engineering
Datacenter networks (particularly, in clouds) nowadays support varieties of services from customers, and a novel paradigm, Software Defined Networking (SDN), is proposed to offer flexible application-aware management of these networks. However, as networks keep scaling up, many difficulties arise. Unlike prior studies on the data plane in SDN, this paper investigates the increasing complexity from deploying the control plane and proposes a novel economical and reconfigurable hybrid-band control mechanism (named ERIC) for large-scale SDN networks. Comparing to the state-of-the-art control mechanism (out-of band), ERIC is much simpler and provides more reliability. Moreover, the number of switches used in the ERIC control plane is only 25% of that in the out-of-band control plane with 9%, throughput differences. As a result, ERIC is proven suitable for datacenters due to low cost and high flexibility and can be applied to large-scale network deployments.
SWF: Segmented Wildcard Forwarding for Flow Migration in OpenFlow Datacenter Networks
(2015)
Kuo, Kuan-Tsen
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Wen, Charles H. -P.
;
Suo, Cheng
;
Tsai, I-Chen
;
電機學院
Networking and performance become major issues in cloud computing. Software Defined Networking (SDN) enables flow -level management and makes routing more effective and flexible for datacenter networks (DCNs). A prior dynamic routing algorithm named Flow Migration shows good results in improving throughput and avoiding congestion through simulation. However, as Flow Migration is applied to a SDN-based DCN, tremendous overhead occurs in modifying flow tables of switches. Therefore, a novel Segmented Wildcard Forwarding (SWF) scheme is proposed to facilitate Flow Migration. SWF leverages the symmetry of a Portland topology and applies wildcard matching for balancing network loading and lowering table -modification cost for flows. Experimental results show that on a Portland 4-8-8 datacenter network, the proposed SWF scheme achieves higher throughput over than the traditional SPB does, and even reduces 70% modification cost used by the original implementation of Flow Migration. As a result, Segmented Wildcard Forwarding (SWF) is proven a mechanism that practically realizes dynamic routing of SDN but also improves network performance as well as cost for flow migration, simultaneously.