If you are operating multiple WLCs in your network, you can collect these devices into a cluster. The APs in a managed WLAN are no longer managed by a single, central WLC but by multiple, synchronized WLCs. For large networks in particular, a WLC cluster provides numerous advantages:
- Automatic network "load balancing" between the individual APs and WLCs;
- Increased failover reliability through the provision of backup WLCs ("hot standby") and automatic redistribution of the APs in the case of a WLC failure;
- Setting up a certificate hierarchy: Management of certificates by a central certification authority (CA), represented either by a master WLC or an external station (such as a server).
As of LCOS 9.00, the cluster function received numerous enhancements described below.