Can I extend my network overlay deployed inside my DC fabric to interconnect multiple fabric network together to form a single logical fabric ?.Is my DCI still a valid solution to interconnect the new fabric-based DC ?.This brings a couple of important questions in regard to DC Interconnect such as: The above is responsible of the recent interest in deploying multi-pathing and segment-ID-based protocols (FabricPath, VxLAN, NVGRE ). The evolution of network and compute virtualization is also creating a new demand to enable the segmentation inside the same fabric to support multiple subsidiaries or tenants over the top of a shared physical infrastructure, helping IT Mgr’s to save money by reducing their CAPEX while reducing the time that it takes to deploy a new application. Server virtualization and workload mobility.Adoption of new software paradigm of highly distributed resources.

If most of qualifiers above have been already successfully addressed with traditional multi-tier layer architecture, today’s Data centres are experiencing an increase of East-West data traffic that is the result of: Scalability : add as many spines as needed to increase the number of servers while maintaing the same oversubscription ratio everywhere inside the fabric.Deterministic Latency : fix and predictable latency between two endpoints with same hop count between any two endpoints, independently of scale.Performance: full cross sectional bandwidth (any-to-any) – all possible equal paths between two endpoints are active.Robustness : while dynamic mobility is allowed on any authorised location of the DC, the failure domain is contained to its smallest zone.Flexibility : allows workload mobility everywhere in the DC.This evolution has been conceived at improving the following : The Datacenter network architecture is evolving from the traditional multi-tier layer architecture, where the placement of security and network s ervice is usually at the aggregation layer, into a wider spine and flat network also known as fabric network ( ‘ Clos’ type), where the network services are distributed to the border leafs.

Tor switch architecture