the lan ports of the switches, where the aruba access points are connected, are showing regular errors .. giant packets etc.

the default settings of the aruba ap's is, that they are doing a path MTU discovery every minute, to find out the best MTU size for them.
if you want to stop this "unnecessary traffic" you need to define a static value:

>> on wlan controller:
ap-group ->> ap system profile ->> AP system profile has an mtu parameter that you can change to 1500 or less.

see also:

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