Common Mistakes done while Bringing up an Iap in cluster.
• Network issues
o IAP fails to get an ip address
o Master and local are part of a different subnet and firewall in between
o Multiple DHCP servers in subnet.
o Native VLAN of the trunk that an Ap is connected is a dummy VLAN or doesn’t have a DHCP server.
• Slave fails to join due to Ap image mismatch
• Slave has different regulatory domain
• Slave has different OEM build than master
• Auto join is disabled
• The uplink of the preferred master in the cluster in unstable.
Here are some Useful Troubleshooting commands which will help
Show log System
Debug-master-beacon (this command works only from console)