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hpe aurba mobility wlan controller >> "port X-Excessive undersized/giant packets on the access points connected switch ports"

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

solution:
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:
https://community.arubanetworks.com/community-home/digestviewer/viewthread?MID=24850

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