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Open Networking - A critical aspect of all open architecture data centre infrastructure is the network interconnecting the processors, storage and peripherals and users. Over time the protocols have become increasingly sophisticated to provide differentiated flow control within the forwarding plane interconnecting applications. The network architecture has grown in a hub and spoke architecture, placing an increasingly unfeasible requirement on the size and complexity of the core switch, and difficult planning decisions on the data centre builder with short term budget constraints. Open networking has arrived to overcome these limitations. The core principle of open networking is the disaggregation of forwarding and flow control on one hand and the architectural change from hub and spoke networks off of huge core switches to distributed Clos architectures in leaf and spine arrangements of many small switches.
Open networking can be used in the data plane or in the management plane. In the management plane taps are filtered using flow control through and overlay network, aggregated and groomed into monitoring equipment. This provides customers with incredible economies of scale in their data analytics, and operational simplicity as the data plane and management plane analytics have the same form and functional equipment base. Two layer filtering, aggregation and grooming over a network of small commodity switch platforms overcomes hardware appliance scale limitations and cost penalties while also opening up new innovative monitoring capabilities possible through distribution and virtualisation of the network function previously locked in a hardware appliance.
