Dell Force10 E1200i FTOS Version 8.4.1.5 Configuration Guide for ExaScale - Page 108
Dell Force10 switch, End-user Device, RADIUS Server
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www.dell.com | support.dell.com End-user Device Dell Force10 switch RADIUS Server EAP over LAN (EAPOL) EAP over RADIUS fnC0033mp Figure 9-1 shows how EAP frames are encapsulated in Ethernet and Radius frames. * Note: FTOS supports 802.1X with EAP-MD5, EAP-OTP, EAP-TLS, EAP-TTLS, PEAPv0, PEAPv1, and MS-CHAPv2 with PEAP. Figure 9-1. EAPOL Frame Format Preamble Start Frame Destination MAC Source MAC Ethernet Type Delimiter (1:80:c2:00:00:03) (Auth Port MAC) (0x888e) EAPOL Frame Padding FCS Range: 0-4 Type: 0: EAP Packet Protocol Version (1) 1: EAPOL Start 2: EAPOL Logoff 3: EAPOL Key 4: EAPOL Encapsulated-ASF-Alert Range: 1-4 Codes: 1: Request 2: Response 3: Success 4: Failure Packet Type Code (0-4) Length ID (Seq Number) EAP Frame Length Range: 1-255 Codes: 1: Identity 2: Notification 3: NAK 4: MD-5 Challenge 5: One-Time Challenge 6: Generic Token Card EAP-Method Code (0-255) Length EAP-Method Frame EAP-Method Data (Supplicant Requested Credentials) The authentication process involves three devices: • The device attempting to access the network is the supplicant. The supplicant is not allowed to communicate on the network until the port is authorized by the authenticator. It can only communicate with the authenticator in response to 802.1X requests. • The device with which the supplicant communicates is the authenticator. The authenicator is the gate keeper of the network. It translates and forwards requests and responses between the authentication server and the supplicant. The authenticator also changes the status of the port based on the results of the authentication process. The Dell Force10 switch is the authenticator. 108 | 802.1X
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