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ndumaj
Staff
ndumaj
Staff
March 23, 2026

Technical Tip: How to fix authentication issues on HPE Aruba switches by adjusting the framed MTU attribute

  • March 23, 2026
  • 0 replies
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Description This article describes how to fix authentication issues on HPE Aruba switches by adjusting the framed MTU attribute. Starting from FortiNAC version 7.6.4, FortiNAC includes the 'Framed-MTU' RADIUS attribute by default in the RADIUS Access-Accept response. Due to this Framed-MTU attribute, Aruba changes the port's MTU value.
Scope FortiNAC-F.
Solution
  1. FortiNAC firmware v7.2.x does not send the Framed-MTU attribute.

  2. Add the Framed-MTU attribute with value 1500 on the RFC attribute associated with the HPE Aruba Switches under Network -> RADIUS -> Attribute Groups:


Figure 1. Add Framed-MTU attribute for HPE Aruba RFC_VlanFigure 1. Add Framed-MTU attribute for HPE Aruba RFC_Vlan
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