Dell Force10 E1200i FTOS Version 8.4.1.5 Configuration Guide for ExaScale - Page 120

www.dell.com | support.dell.com Guest and Authentication-Fail VLANs Typically, the authenticator (Dell Force10 system) denies the supplicant access to the network until the supplicant is authenticated. If the supplicant is authenticated, the authenticator enables the port and places it in either the VLAN for which the port is configured, or the VLAN that the authentication server indicates in the authentication data. Note: Ports cannot be dynamically assigned to the default VLAN. If the supplicant fails authentication, the authenticator typically does not enable the port. In some cases this behavior is not appropriate. External users of an enterprise network, for example, might not be able to be authenticated, but still need access to the network. Also, some dumb-terminals such as network printers do not have 802.1X capability and therefore cannot authenticate themselves. To be able to connect such devices, they must be allowed access the network without compromising network security. The Guest VLAN 802.1X extension addresses this limitation with regard to non-802.1X capable devices, and the Authentication-fail VLAN 802.1X extension addresses this limitation with regard to external users. • If the supplicant fails authentication a specified number of times, the authenticator places the port in the Authentication-fail VLAN. • If a port is already forwarding on the Guest VLAN when 802.1X is enabled, then the port is moved out of the Guest VLAN, and the authentication process begins. Configuring a Guest VLAN If the supplicant does not respond to a Request Identity frame within a determined amount of time ([reauth-max + 1] * tx-period, refer to Configuring Request Identity Re-transmissions) the system assumes that the host does not have 802.1X capability, and the port is placed in the Guest VLAN. Configure a port to be placed in the Guest VLAN after failing to respond within the timeout period using the command dot1x guest-vlan from INTERFACE mode, as shown in the following example. FTOS(conf-if-gi-1/2)#dot1x guest-vlan 200 FTOS(conf-if-gi-1/2)#show config ! interface GigabitEthernet 1/2 switchport dot1x guest-vlan 200 no shutdown FTOS(conf-if-gi-1/2)# View your configuration using the command show config from INTERFACE mode, as shown in the example above , or using the command show dot1x interface command from EXEC Privilege mode as shown in the second example in Configuring an Authentication-Fail VLAN. 120 | 802.1X