The Architectures Of Data Center Networks

844 Words Sep 27th, 2014 4 Pages
A typical data center harbors many thousands of hosts. The architectures of data center networks are of two types. Data center network designs are
Server-routed networking design
Switch-routed networking design
Server-Routed Networking Design: The server-routed networking design of a DCN consists of Core (layer 3) switches, TOR (top of the rack or layer 2) switches and server racks. It basically has two tier switching involved for routing a packet. It has a recursively defined structure. In general a server rack is connected to a TOR switch and the TOR switch is connected to a core switch. Packet routing from outside the DCN to the server takes place by passing packets through the core switches. Load balancing in a data center network is taken care of by core switches.
Routing from core switches to the specific server: Core switches are directly connected to particular server i.e. the first core switch is connected to all the first servers in any server rack and likewise the remaining core switches are connected to the respective servers.
Routing from core switch to server involving TOR switches: Routing takes place by packet entering the DCN through any core switch, then passed to the server of the destination server rack and sorting with the help of TOR switch to finally reach the destination server.
Routing internally from a server in server rack to another server in a different server rack: Routing internally can take place in three different ways.
• Routing directly…
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