ColdFusion Server 5 supports Cisco's Local Director load balancing device.
Note: Most high-end Hardware Load Balancing Devices (HLD) have features roughly similar to F5 Networks BIG-IP Extended Content Verification (ECV). When ColdFusion is properly configured with a probe (cfprobe.cfm), the ECV will detect a failure on one of the distributed ColdFusion application servers and redirect sessions to a working distributed pair of web and application servers. If you are using an Alteon ACEdirector (AD3), scripted health checking of string generated by ColdFusion code will provide the necessary redirection/restriction around a stalled server. This is a critical step especially if you are running your server farm in the distributed mode with the Web servers set up on separate platforms from your ColdFusion application servers. It is not hard to picture your AD3 or BIGIP pouring sessions on a real/Web server that has a stalled back-end application server. Without some form of health monitoring, what would tell the HLD that the application server behind the real/Web server as down.