When you need to balance the load of traffic over multiple TCP/IP application servers, the Cisco family of Local Directors is just what you need.  This key component of a content delivery network, this device routes client requests to the best web server at the site of origin. 

Models:

Local Director 417 - can handle 8000 virtual and real IP addresses and 700,000 simultaneous TCP connections with a throughput of 80Mbps

Local Director 417G - can handle 64,000 virtual and real IP addresses and One Million simultaneous TCP connections with a throughput of 400Mbps