An ArubaOS user role determines the firewall policies and bandwidth contracts that apply to the client's traffic. When a user is authenticated, they are assigned a role, and this role has associated policies that govern network access rights, Quality of Service (QoS), Layer 2 forwarding, Layer 3 routing behaviors, and bandwidth contracts for users or devices.
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Aruba Networks official documentation on user roles in ArubaOS.
Technical guides that detail user role definitions and their impact on network policies.