The SLB feature is a Cisco IOS-based solution that provides IP server load balancing. Using the IOS�SLB feature, the network administrator defines a virtual server that represents a group of real servers in a cluster of network servers known as a server farm. In this environment the clients are configured to connect to the IP address of the virtual server. The virtual server IP address is configured as a loopback address, or secondary IP address, on each of the real servers. When a client initiates a connection to the virtual server, the IOS�SLB function chooses a real server for the connection based on a configured load-balancing algorithm.

Load balancing via a cisco. Pair with HSRP for redundant load balancing and neato HA.

Configuring Server Load Balancing