Cisco 2950 Software Configuration Guide - Page 231
Configuring the Switch-to-RADIUS-Server Communication
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Chapter 10 Configuring 802.1x Port-Based Authentication Configuring 802.1x Authentication This example shows how to enable AAA and 802.1x on a port: Switch# configure terminal Switch(config)# aaa new-model Switch(config)# aaa authentication dot1x default group radius Switch(config)# dot1x system-auth-control Switch(config)# interface fastethernet0/1 Switch(config-if)# switchport mode access Switch(config-if)# dot1x port-control auto Switch(config-if)# end Configuring the Switch-to-RADIUS-Server Communication RADIUS security servers are identified by their host name or IP address, host name and specific UDP port numbers, or IP address and specific UDP port numbers. The combination of the IP address and UDP port number creates a unique identifier, which enables RADIUS requests to be sent to multiple UDP ports on a server at the same IP address. If two different host entries on the same RADIUS server are configured for the same service-for example, authentication-the second host entry configured acts as the fail-over backup to the first one. The RADIUS host entries are tried in the order that they were configured. Beginning in privileged EXEC mode, follow these steps to configure the RADIUS server parameters on the switch. This procedure is required. Step 1 Step 2 Command Purpose configure terminal Enter global configuration mode. radius-server host {hostname | Configure the RADIUS server parameters on the switch. ip-address} auth-port port-number key For hostname | ip-address, specify the host name or IP address of the string remote RADIUS server. For auth-port port-number, specify the UDP destination port for authentication requests. The default is 1812. For key string, specify the authentication and encryption key used between the switch and the RADIUS daemon running on the RADIUS server. The key is a text string that must match the encryption key used on the RADIUS server. Note Always configure the key as the last item in the radius-server host command syntax because leading spaces are ignored, but spaces within and at the end of the key are used. If you use spaces in the key, do not enclose the key in quotation marks unless the quotation marks are part of the key. This key must match the encryption used on the RADIUS daemon. Step 3 Step 4 Step 5 end show running-config copy running-config startup-config If you want to use multiple RADIUS servers, re-enter this command. Return to privileged EXEC mode. Verify your entries. (Optional) Save your entries in the configuration file. To delete the specified RADIUS server, use the no radius-server host {hostname | ip-address} global configuration command. 78-11380-10 Catalyst 2950 and Catalyst 2955 Switch Software Configuration Guide 10-13
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