I've discovered an issue with our WLC 4400 series controllers when we do firmware upgrades (recently moved to 6.0.199) it seems to reset the dhcp server on the controller but the Access points still retain their old IP until the lease runs out (48hrs). This means that any AP's requesting a new lease often get an IP conflict for the first 48hrs after the upgrade and we experienced areas where AP's wouldnt connect.
Is this a common issue and is there anyway to get the AP's to request a new address from the controller?
When clients use the controller's internal DHCP server, IP addresses are not preserved across reboots. As a result, multiple clients can be assigned the same IP address. To resolve any IP address conflicts, clients must release their existing IP address and request a new one.
The same also applies on newer releases such as 220.127.116.11 and 7.0.
Transferring Crash file from standby: Login to the Active WLC in HA.
From CLI: (Cisco Controller) >transfer upload datatype crash (Cisco
Controller) >transfer upload filename (Cisco
Controller) >transfer upload mode tftp (Cisco Controller) >transfer
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