We have a 2 LDAP servers multi-master set-up. Procuring
hardware load balancing is not an option hence would request
to pass on any information you may have to achieve
load-balancing through either :
1) Some config in LDAP to achieve load balancing
2) Software load balancer
3) Some logic in custom application that people use
frequently when connecting to multi-master setup
For really basic load balancing, a round-robin DNS entry works well.