Can v7's hierarchical AC architecture support v5's APs?
Generally, whether an AP can be adapted to an AC is checked and confirmed from the release manual -fit AP adaptation list. Even if it is upgraded from v5 to v7, as long as the model is compatible, the AP can go online.
However, in a hierarchical AC network, v5 APs need to be upgraded to v7 in advance before they can go online on ACs in the hierarchical AC network.
This is because the command line and packet interaction of the v5 and v7 layered ACs are different, and they cannot be used together.