Data centers have moved from the enterprise to a cloud-based infrastructure, and from a physical sever being a unit of computing to a virtual machine (VM) as a unit of computing. From the VM technology has evolved the concept of cloud technology, which has virtualized the compute, networking and storage. All this technology enabled the leasing of VMs to customers for public cloud providers such as Amazon, Google, and Microsoft etc. The advances of the hypervisor and cloud technology by the likes of VMware, Xen, and the KVM community made this possible.

Static Anycast Gateway for EVPN/VXLAN is a default IP gateway addressing mechanism that enables the use of the same VLAN and the same gateway IP and MAC addresses across all the leaf switches that are part of the same L3 VNI in a VXLAN network.

VLAN – Virtual Local Area Network is a technique of isolating LANs based on the 802.1Q standard with a 16-bit protocol identifier tag and a 16-bit control information tag, which is broken further into a 12-bit VLAN identifier, 3-bit 802.1p-based priority code point, and 1-bit 802.1Q-based drop eligible indicator (indicating congestion). Leaf-and-Spine Network – It is a two-tiered tree-like structure, as shown in the Figure 2, with a leaf layer and a spine layer. One can think of the access and south-bound aggregation layers merging to become the leaf layer and the core and north-bound aggregation layers merging to become the spine layer. This is how a Data Center (DC) Network looks.