Cisco Cisco IOS Software Release 12.2(33)SRE

IOS SLB provides the following features:

IOS SLB provides the following routing features:

IOS SLB provides the following load-balancing algorithms:

You can specify one of these algorithms as the basis for choosing a real server for each new connection 
request that arrives at the virtual server.

For both algorithms, connections in closing state continue to be counted against the number of 
connections assigned to a real server. This impacts least connections more so than round robin, because 
the number of connections impacts the least connections more. IOS SLB adjusts the number of 
connections per real server, and the algorithm metrics, each time a connection is assigned.