Wireless Access

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Access network design for branch, remote, outdoor and campus locations with Aruba access points, and mobility controllers.
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Change MTU size for controller-based Access Points

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  • 1.  Change MTU size for controller-based Access Points

    Posted Jan 11, 2019 04:03 AM

    Due to the fact that I see a lot of messages like "port X-Excessive undersized/giant packets" in the logs I have to set the MTU to 1500.

     

    Q: Can someone tell me how I can change the MTU size for controller-based Access Points?

     

    Thanks in advance!



  • 2.  RE: Change MTU size for controller-based Access Points
    Best Answer

    EMPLOYEE
    Posted Jan 11, 2019 04:13 AM

    To answer your question: in the ap-group, there is an ap system profile.  The AP system profile has an mtu parameter that you can change to 1500 or less.

     

    With that being said, access points do path MTU discovery every minute and that is the source of the "giants" that you see on the switchport.  The messages can be ignored, or you can statically configure the MTU as instructed above to make the messages stop.

     

    Please see the articles here:  https://community.arubanetworks.com/t5/forums/searchpage/tab/message?advanced=false&allow_punctuation=false&q=giants for more information.