How can the switch connect to the RADIUS server when 802.1x authentication is configured

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When you configure 802.1x authentication, run the dot1x enable command to enable 802.1x authentication globally and on an interface. In addition, ensure that the switch and the RADIUS server can communicate at Layer 3.

Other related questions:
S series switch with 802.1x configured cannot connect to the RADIUS server
For S series switches except S1700 switches, to configure 802.1x authentication, run the dot1x enable command to enable 802.1x authentication globally and on an interface. In addition, ensure that the switch and the RADIUS server can communicate at Layer 3.

How to configure remote authentication for 802.1x authentication users on S series switches
802.1x authentication user information (including the user name, password, and other attributes) for remote authentication and authorization is configured on a remote AAA server. Remote authentication and authorization for 802.1x authentication users feature high network security. For S series and E series switches (except the S1700) running V200R003C10 and earlier versions, NAC can be configured only in common mode. For switches running V200R005C00 and later versions, NAC can be configured in common or unified mode. Accordingly, remote authentication for 802.1x authentication users can be configured in common or unified mode. For switches running V200R009C00, the configuration model of NAC unified mode changes. Query the appropriate product manual based on the switch model and version. The following links are for reference only. - For the configuration example in common mode, see "Typical User Access and Authentication Configuration - Typical NAC Configuration (Common Mode) - Example for Configuring 802.1x Authentication to Control Internal User Access" in S1720&S2700&S3700&S5700&S6700&S7700&S9700 Typical Configuration Examples. - For the configuration example in unified mode on switches running versions from V200R005C00 to V200R008C00, see "Typical User Access and Authentication Configuration - Typical NAC Configuration (Unified Mode) (V200R005C00 to, V200R008C00) - Example for Configuring 802.1x Authentication to Control Internal User Access" in S1720&S2700&S3700&S5700&S6700&S7700&S9700 Typical Configuration Examples. - For the configuration example in unified mode on switches running V200R009C00 and later versions, see "Typical User Access and Authentication Configuration - Typical NAC Configuration (Unified Mode) (V200R009C00 and Later Versions) - Example for Configuring 802.1x Authentication to Control Internal User Access" in S1720&S2700&S3700&S5700&S6700&S7700&S9700 Configuration Guide - User Access and Authentication.

Why does RADIUS authentication fail when the RADIUS server template and RADIUS server are properly configured
This problem has the following possible causes: -The IP address of the router (a RADIUS client) is not configured on the RADIUS server, so the RADIUS server cannot send an authentication response packet to the router. -Different shared keys are configured on the router and the RADIUS server.

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