Abstract
The construction of data center network by applying SDN technology has become a hot research topic. The SDN architecture has innovatively separated the control plane from the data plane which makes the network more software-oriented and agile. Moreover, it provides virtual multi-tenancy, effective scheduling resources and centralized control strategies to meet the demand for cloud computing data center. However, the explosion of network information is facing severe challenges for SDN controller. The flow storage and lookup mechanisms based on TCAM device have led to the restriction of scalability, high cost and energy consumption. In view of this, a source-controlled data center network (SCDCN) model is proposed herein. The SCDCN model applies a new type of source routing address named the vector address (VA) as the packet-switching label. The VA completely defines the communication path and the data forwarding process can be finished solely relying on VA. There are four advantages in the SCDCN architecture. 1) The model adopts hierarchical multi-controllers and abstracts large-scale data center network into some small network domains that has solved the restriction for the processing ability of single controller and reduced the computational complexity. 2) Vector switches (VS) developed in the core network no longer apply TCAM for table storage and lookup that has significantly cut down the cost and complexity for switches. Meanwhile, the problem of scalability can be solved effectively. 3) The SCDCN model simplifies the establishment process for new flows and there is no need to download flow tables to VS. The amount of control signaling consumed when establishing new flows can be significantly decreased. 4) We design the VS on the NetFPGA platform. The statistical results show that the hardware resource consumption in a VS is about 27% of that in an OFS.
Highlights
New techniques such as cloud computing and big data have promoted network applications, computing and storage resources to migrate to DCN [1]
Network can allocate a certain data forwarding routine according to VA and that means the VA is a source routing address. We apply this kind of source routing address as the packet switching label to data plane in DCN and adopt multiple controllers for multi-domain management in control plane that develops the SCDCN model
To cope with features of high bandwidth and traffic in modern DCN, we employ multiple controllers for hierarchical multidomain management based on OpenFlow technique that has not merely improved processing ability of controllers and routing efficiency and reduced the computational complexity for control plane
Summary
New techniques such as cloud computing and big data have promoted network applications, computing and storage resources to migrate to DCN [1]. The paper puts forward the SCDCN model which introduces multi-controllers for multi-domain management It adopts the VA as switching label in data plane which defines the communication path independently. Network can allocate a certain data forwarding routine according to VA and that means the VA is a source routing address We apply this kind of source routing address as the packet switching label to data plane in DCN and adopt multiple controllers for multi-domain management in control plane that develops the SCDCN model. The local controller checks whether A and C are in the same network domain according to the local topology information If they are not, it sends the routing request to the upper controller which will start the routing module and calculate a routing path. The mutual trust communication of any data type has been established afterwards
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