Version Description8.3.12.0 Introduced on the S4810.8.3.11.1 Introduced on the Z9000.7.6.1.0 Introduced on the C-Series and S-Series.7.4.1.0 Introduced on the E-Series.Related Commands • dot1x authentication (Configuration) — enable dot1x globally.dot1x critical-vlanConfigure critical-VLAN for users or devices when authentication server is not reachable.Syntax [no] dot1x critical-vlan vlan-idParameters vlan-id Enter the VLAN identifier. The VLAN-ID range is from 1 to 4094.Defaults Not Configured.Command Modes INTERFACEINTERFACE (BATCH MODE)Command History This guide is platform-specific. For command information about other platforms, refer to the relevant DellNetworking OS Command Line Reference Guide.Version Description9.10(0.0) Introduced on the S3100 series, S4048–ON, S4048–ON, S4810, S4820T, S5000, S6000,S6000–ON, S6100–ON, the Configuration Terminal Batch mode on C9010, Z9100–ON,and Z9500.9.9(0.0) Introduced on the C9000 Series.Usage Information The dot1x critical-vlan command configures critical VLAN for the interface. If the authentication server isnot reachable or not responding, the authenticator places the port or the supplicant in critical VLAN within the firstattempt.Use this command in Interface Batch mode to configure critical VLAN for users in a dual-homing setup.Example Dell(conf)#show dot1x interface ten gigabit ethernet 0/41802.1x information on Te 0/41:-----------------------------Dot1x Status: EnablePort Control: AUTOPort Auth Status: AUTHORIZED (CRITICAL-VLAN)Re-Authentication: EnableUntagged VLAN id: 400Guest VLAN: EnableGuest VLAN id: 400Auth-Fail VLAN: Enable160 802.1X