Comparison of Virtualization Algorithms and Topologies for Data Center Networks

Segment Routing Green Spine Switch Management System for DCN

“…DCN has been built over the years with various kind of topologies. The research work of [3] [5] [8] [10] [11] [83], has shown how vital the topology used in building a DCN is essential to energy savings, as well as its performance. Hence, based on these works and Cisco's recommendation [4] [91], the topology used in these thesis work, was the leafspine topology.…”

“…From various surveys carried out on DCN topologies, we can say that there are two major architectures used, the switch-centric, and the server-centric topologies [5] [84] [85] [86] [87]. It can be summarized, that the most preferred topology used for building DCNs which integrates the use of virtualization technologies, with better network performance as to throughput and congestions, scalability, and latency is the switch-centric topology (a DCN topology such that the routing technique is centered on the switches) [83][84][85][86][87]. In this thesis, the clos topology (A multistage circuit switching systems used for data centers architecture) is used interchangeably for the switch-centric topology based on the original design for a clos topology used for DCN (although not all clos topologies are switchcentric).…”

“…A recent study in [83], focused on the performance of various DCN topologies in the switch-centric family, shows that for building a DCN consisting of the same number of hosts, VMs, and leaf switches, the leaf-spine infrastructure, which is a two-tier topology, consumes less energy compared to the traditional 3-tier clos topologies, such as Fat-tree, F 2 -Tree, Diamond, etc. A further explanation the switch-centric topologies is provided in Section 2.2 and 2.3 of this thesis.…”

“…Of the clos family DCN, the switch-centric topology is widely used by many data centers of recent, e.g., Google (google Fat-tree), Facebook (leaf-spine, two-tier), Microsoft [83] [87], etc. The reason is its improved performance in integrating virtualization technology for servers into the DCN, compared to the server-centric topologies.…”

“…It should support { } servers, which results in high scalability [4] [56] (where k is the number of ports on the switches). Tables 2.1 -2.3 show essential metrics adapted from both [3] & [83] from the experiments in comparing these DCN topologies. summarized the efficiency of leaf-spine topology in a DCN over other topologies in the clos family for deploying virtualization technology.…”