Administrator Guide

Version Description
9.2(1.0) Introduced on the Z9500.
8.3.19.0 Introduced on the S4820T.
8.3.11.1 Introduced on the Z9000.
8.5.1.0 Added support for 4-port 40G line cards on ExaScale.
8.3.7.0 Introduced on the S4810.
7.6.1.0 Introduced on the S-Series.
7.5.1.0 Introduced on the C-Series.
6.2.1.1 Introduced on the E-Series.
Usage Information
Untagged interfaces can only belong to one VLAN.
In the Default VLAN, you cannot use the no untagged interface command. To remove an untagged
interface from all VLANs, including the Default VLAN, enter INTERFACE mode and use the no switchport
command.
Related
Commands
• interface vlan — configures a VLAN.
• tagged — specifies which interfaces in a VLAN are tagged.
Far-End Failure Detection (FEFD)
The Dell Networking operating software supports far-end failure detection (FEFD) on the Ethernet interfaces.
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 to 10 seconds.
• By default, FEFD is disabled.
debug fefd
Enable debugging of FEFD.
C9000 Series
Syntax
debug fefd {events | packets} [interface]
To disable debugging of FEFD, use the no debug fefd {events | packets} [interface] command.
Parameters
events Enter the keyword events to enable debugging of FEFD state changes.
packets Enter the keyword packets to enable debugging of FEFD to view information on
packets sent and received.
interface (OPTIONAL) Enter the following keywords and slot/port or number information:
• For a 10-Gigabit Ethernet interface, enter the keyword TenGigabitEthernet then
the slot/port information.
• For a 40-Gigabit Ethernet interface, enter the keyword fortyGigE then the slot/
port information.
Command Modes EXEC Privilege
Command History
This guide is platform-specific. For command information about other platforms, refer to the relevant Dell
Networking OS Command Line Reference Guide.
The following is a list of the Dell Networking OS version history for this command.
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