I'm working on a LAB environment to find the best (or less painful) path to migrate a customer installed base to V10.
This customer is running V9.21.20 (latest code) and have about 140 legacy (non V10-supported) access points deployed, and only about 10 38xx.
With the discontinuation of thee 38xx family, now we need to create a way to keep it working and expanding, while they are working on the phased replacement of the legacy base (26xx and 36xx, indoor and outdoor).
I was thinking about moving all legacy APs to the "CONTROLLER-1" and keep it as V9, while upgrading "CONTROLLER-2" to V10 and moving all the newer APs (38xx) to it.
In the LAB I found some issues... V9.21.20 can't get synchronized with V10.41.08 (besides it shows on the V9 side's VnS-> Sync Summary as Global Config Synchronized, on the V10 side it shows as Not Synchronized, just as all other VNS, WLANS, Topologies, and everything).
The Availability and Mobility tunnels seems to be UP (at the home screen, but on logs it shows as flappling, but I need to investigate this further... all connectivity is OK and worked fine before the CONTROLLER-2 upgrade to V10).
I know we are talking about different releases, and many things can't work, but it seems that nothing works with this scenario.
Ok, we can't have HA for legacy APs and newer features can't be synchronized, but theoretically the customer could live without it while he doesn't upgrade the legacy APs, but not even the GUEST PORTAL accounts get synchronized, creating a BIG issue, forcing to create two guest accounts for the same user to make it work on both environments (by the way, the customer don't have NAC).
Any ideas or experiences?