This IP corner article discusses the modern data center (DC) and its requirements for high availability. High availability can be achieved on several levels. Data centers are designed to be highly available internally. When even greater availability is required, additional high availability is achieved by using a geographically separate secondary data center. Adding a secondary data center introduces the need for interconnection between the primary and secondary data centers. 

In this article, Jaroslav Rajić, CCNP and CCSI at NIL Data Communications, explores available options for that interconnection, including server clusters and Storage Area Network traffic exchange, focusing on Multi-Protocol Label Switching (MPLS) as the underlying transport technology.