1. In the first scenario, the AP model must
adhere to the regulatory standards of the country in which it is going to be installed. Before purchasing, configuring and installing an AP, make sure that the model is the correct one for the country it's going to be shipped to.
Amongst others, the list of models might include:
2. In the second scenario (multiple routers and MPLS networks) it is recommended to change the MTU size to a minimum and then try to push the config to the APs again.CLI commands:
<900-1500> Maximum packet size. Will be rounded down to nearest (4 + a
multiple of 8).
If this step solves the problem, the MPLS network should be further investigated as there may be an issue with fragmentation.