I am starting a new thread for this issue as the community helped me determine that my previous understanding of this issue was mistaken.
Recently, all the APs on our networks have been unable to receive a valid IP address from the correct Vlan when plugged into ethernet or after being provisioned. I have been working around this issue by plugging downed APs into the console, interrupting the boot sequence, running the "dhcp" command, saving the good IP address.
I thought I was purging a bad IP address and saving good DHCP settings, but I now realize I have essentially just been using the console to statically assign the APs an IP from the correct Vlan.
I'm not sure why DHCP has stopped working correctly. It seems to be "half" working as the console workaround does receive a valid IP from DHCP. It just must be saved manually as a static address.
I'd really like to keep the APs on DHCP and allow them to renew from the address pool as needed. I can make reservations on the addresses but it is my understanding that this is not the recommended practice for managing APs.
DHCP is not configured on the Aruba controller, but is provided externally. The only changes that have been made on our network is that I upgraded our DCs and in the process migrated the DHCP server on one of our VLANs to a new IP address. I also created a load-balancing/failover relationship between the upgraded DCs that previously did not exist.
Here are the specifics of what is happening:
1.Plug the AP in. It receives an IP from VLAN 2-10.0.0.0 network. APs do not come up on this VLAN. (VLAN 2 is where the DC upgrades took place)
2. Plug the AP into the console and interrupt the boot sequence, run "dhcp", save the address with "save" and then boot. AP comes up with an IP from VLAN 50--10.50.0.0 network. This VLAN is running a DHCP server on a different device and service than VLAN 2.
Last question, that maybe a bit a non-sequitur. Can anyone tell me if the default loopback address for an Aruba controller is the controller's master address? I don't think this issue is related to rule 43 in DHCP options, but I would still like to configure it correctly.
Thank you so much!