In a fat-tree switch fabric, data center managers are faced with multiple configuration options that require decisions regarding application, cabling and where to place access switches that connect to servers. With fewer tiers of switches, server-to-server communication is improved by eliminating the need for communication to travel through multiple switch layers.įat-tree switch fabrics, also referred to as leaf and spine, are one of the most common switch fabrics being deployed in today's data center. This has many data centers moving to switch fabric architectures that are limited to just one or two tiers of switches. With equipment now located anywhere in the data center, data traffic between two servers in a three-tier architecture may have to traverse in a north-south traffic (i.e., switch-to-switch) pattern through multiple switch layers, resulting in increased latency and network complexity. However, this architecture does not adequately support the low-latency, high-bandwidth requirements of large virtualized data centers. Three-tier switch architectures have been common practice in the data center environment for several years. Experiments of parameter servers demonstrate that it accelerates the transmission of data, which could provide a direct and fast path, especially for east-west traffic.From the April, 2014 Issue of Cabling Installation & Maintenance Magazine Pros and cons exist for each configuration, and depend largely on an individual data center's needs.īy Robert Carlson, Communications Cable and Connectivity Association Via the direct connection and the relaying of VCS modules, the stratospheric network could support not only the sharing of uplinks between Tor switches but also dynamical forwarding. The link of VCS (Virtual Circuit Switching) is divided into virtual channels by time division, and packets are sliced into cells to be transmitted at a specific time slot. It acts as a supplement to tropospheric transmission across the hierarchical structure to alleviate global hotspots. We propose a stratospheric network of the data center, which combines virtual circuit switching and Tor switches. Reconfigurable circuit switching is utilized to reduce regional hotspots, which causes the problem of routing oscillation. The hierarchical structure of the data center network is more and more unsuitable for increasing east-west traffic from virtual machines.
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