Security Commands 843MAC Authentication Bypass (MAB) provides 802.1x unaware clientscontrolled access to the network using the devices’ MAC address as anidentifier. This requires that the known and allowable MAC address andcorresponding access rights be prepopulated in the authentication server.MAB only works when the port control mode of the port is MAC-based.Port access by MAB clients is allowed via local authentication if the userdatabase has corresponding entries added for the MAB clients with user nameand password attributes set to the MAC address of MAB clients. Alternatively,a RADIUS authentication server can be configured with the MAC addressesof the MAB clients. In this configuration, the switch uses EAP-MD5authentication to communicate with the authentication server. No otherauthentication or privacy protocol is supported for server side authentication.Guest VLANThe Guest VLAN feature allows a Dell EMC Networking switch to provide adistinguished service to unauthenticated network devices (not rogue devicesthat fail authentication). This feature provides a mechanism to allow networkdevices to have network access to reach an external network while restrictingtheir ability to access the internal LAN.When a client that does not support 802.1x is connected to an unauthorizedport that is 802.1x-enabled, the client does not respond to the 802.1x requestsfrom the switch. The port remains in the unauthorized state and the client isnot granted access to the network. If a guest VLAN is configured for that port,then the port is placed in the configured guest VLAN, and the port is movedto the authorized state, allowing network access to the client over the guestVLAN.Unauthenticated VLANThe Unauthenticated VLAN feature allows a Dell EMC Networking switch toprovide a distinguished service to unauthorized network devices that attemptand fail authentication. This feature provides a mechanism to allow networkdevices to have network access to an external network while restricting theirability to access the internal LAN.When a client network device that supports 802.1x is connected to anunauthorized port that is 802.1x enabled with no unauthenticated VLANconfigured and the client attempts and fails to authenticate, the port remains
