ToR offers many benefits, along with some drawbacks. Connections within the rack can be any combination of copper, fiber or direct access cabling.Īmong other capabilities, ToR switches handle operations, including Layer 2 and Layer 3 frame and packet forwarding, data center bridging and the transport of Fibre Channel over Ethernet for the racks of servers connected to them. Each in-rack switch, in turn, is connected to the aggregation switch block using fiber. In high-density data center deployments, switches are placed in every rack, and in most cases, connected to a computing device such as a bare-metal server used by only one tenant or blade server chassis. To better enable access to the horizontal fiber optic cabling that connects in-rack switches to aggregation switches, they are usually positioned near the top of the rack, however. Top-of-rack (ToR) switches are most often placed at the top of the rack but can be placed anywhere in the rack. The in-rack network switch, in turn, is connected to aggregation switches, most often via fiber optic cable. Top of rack architecture generally places a network fiber switch in every rack to connect easily with every other device in the rack. Top-of-rack switching is a data center architecture design in which computing equipment like servers, appliances and other switches located within the same or adjacent rack are connected to an in-rack network switch. Eamon McCarthy Earls, Global North Institute.
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