Defaults All interfaces in Layer 2 mode are untagged.Command Modes INTERFACE VLANCommand History Version 8.3.11.1 Introduced on the Z9000.Version 8.5.1.0 Added support for 4-port 40G line cards on ExaScale.Version 8.3.7.0 Introduced on the S4810.Version 7.6.1.0 Introduced on the S-Series.Version 7.5.1.0 Introduced on the C-Series.pre-Version6.2.1.1Introduced on the E-Series.UsageInformationUntagged interfaces can only belong to one VLAN.In the Default VLAN, you cannot use the no untagged interface command. To removean untagged interface from all VLANs, including the Default VLAN, enter INTERFACE mode anduse the no switchport command.RelatedCommandsinterface vlan – configures a VLAN.tagged – specifies which interfaces in a VLAN are tagged.Far-End Failure Detection (FEFD)The Dell Force10 operating software (FTOS) supports far-end failure detection (FEFD) on the Ethernet interfaces of the E-Series, Z-Series, and S4810 platforms.The FEFD feature detects and reports far-end link failures.• FEFD is not supported on the Management interface.• During an RPM failover, FEFD is operationally disabled for approximately 8-10 seconds.• By default, FEFD is disabled.debug fefdEnable debugging of FEFD.E-Series, Z-Series, S4810Syntax debug fefd {events | packets} [interface]To disable debugging of FEFD, use the no debug fefd {events | packets}[interface] command.949
