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Building IP-Clos Data Centers: the GRNET case

Layer 2 has traditionally been a weakness in data center design in terms of availability and scale. IP-Clos or IP Fabric based DCs answer those limitations by providing a design with nothing more than Layer 3 protocols while introducing in the process, new features like active active server multi-homing as well as addressing the 4k VLAN limitation. In this paper we will present the case of GRNET: building 3 DCs based on IP-Clos to house our computing and storage services while relying on Ansible for initial deployment and configuration management.


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