![]() Some supplicants will give up on IEEE 802.1X authentication after some number of failures, and some may continue forever. MAB will succeed, and the device will again have temporary access until and unless the supplicant tries to authenticate again. ![]() If next-method is configured and a third authentication method (such as WebAuth) is not enabled, then the switch will return to the first method (MAB) after the held period.What happens next depends on the configured event-fail behavior. If a device fails IEEE 802.1X authentication after successful MAB (short for MAC Authentication Bypass), the device will have temporary network access between the time MAB succeeds and IEEE 802.1X authentication fails. Though MAB is authenticating, supplicant authentication using IEEE 802.1X is failing. The same is depicted in the figure below:Įxample: A Cisco switch is configured with the following commands:Īuthentication event fail action authorize vlan 123 This will ensure, indefinite attempts are not made to dot1x after each successful mab attempt. In the above command sequence, if the auth-fail VLAN is configured, endpoints that fail IEEE 802.1X authentication after successful MAB will be placed in the auth-fail VLAN, and no other methods will be attempted. For example, consider:Īuthentication event no-response authorize VLAN 123 There are some variations possible in the configuration. Since, both MAB and dot1x are failing, and web-auth is not enabled yet, the supplicant will never get any kind of access to the network. If MAB fails, dot1x authentication will be tried, and lastly the web-auth authentication. Solution: As per the given commands, MAB (MAC Authentication Bypass) will be tried first. Supplicant authentication using MAB and IEEE 802.1X are failing, and the third authentication method Web-Auth is not enabled. If the authentication server determines the credentials are valid, the supplicant (client device) is allowed to access resources located on the protected side of the network.Įxample: Consider the following configuration commands:Īuthentication priority mab dot1x web-authĪuthentication event fail action next-method Authentication server: An authenticator forwards the credentials to the authentication server for verification. With 802.1X port-based authentication, the supplicant provides credentials, such as user name/password or digital certificate, to the authenticator.ģ. The supplicant (i.e., client device) is not allowed access through the authenticator to the protected side of the network until the supplicant's identity has been validated and authorized. Authenticator: The authenticator acts like a security guard to a protected network. The authenticator is a network device, such as an Ethernet switch or wireless access point and the authentication server is typically a host running software supporting the RADIUS and EAP protocols.Ģ. The term "supplicant" is also used interchangeably to refer to the software running on the client that provides credentials to the authenticator. Supplicant: The supplicant is a client device (such as a laptop) that wishes to attach to the LAN/WLAN. ![]() Delay: By default, 802.1X allows no access before authentication.Ĩ02.1X authentication involves three parties:ġ. Legacy endpoint support: By default, 802.1X provides no network access to endpoints that cannot authenticate because they do not support 802.1X.Ģ. User and device authentication: 802.1X can be used to authenticate devices and users.ġ. Transparency: It is possible to deploy 802.1X in a way that is transparent to the end user.ĥ. For example, a user might be authorized into a specific VLAN or assigned a unique access list that grants appropriate access for that user.Ĥ. Identity-based services: 802.1X enables you to leverage an authenticated identity to dynamically deliver customized services. 802.1X acts at Layer 2 in the network, allowing you to control network access at the access edge.ģ. Security: 802.1X provides a strong authentication method. Visibility: 802.1X provides greater visibility into the network because the authentication process provides a way to link a username with an IP address, MAC address, switch, and port.Ģ. Important features of 802.1X on wired networks:ġ. It provides an authentication mechanism to devices wishing to attach to a LAN or WLAN. It is part of the IEEE 802.1 group of networking protocols. IEEE 802.1X is an IEEE Standard for port-based Network Access Control (PNAC).
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