The data center is at the foundation of modern software technology, serving a critical role in expanding capabilities for enterprises. The traditional data center uses a three-tier architecture, with servers segmented into pods based on location.
In 2010, Cisco introduced virtual-port-channel (vPC) technology to overcome the limitations of Spanning Tree Protocol. vPC eliminates the spanning-tree blocked ports, provides active-active uplink from the access switches to the aggregation routers, and makes full use of the available bandwidth. With vPC technology, Spanning Tree Protocol is still used as a fail-safe mechanism. vPC technology works well in a relatively small data center environment in which most traffic consists of northbound and southbound communication between clients and servers.