show fefd
View FEFD status globally or on a specific interface.
E-Series, Z-Series, S4810
Syntax
show fefd [interface]
Parameters
interface
(OPTIONAL) Enter the following keywords and slot/port or number 
information:
• For a 1-Gigabit Ethernet interface, enter the keyword 
GigabitEthernet followed by the slot/port information.
• For a SONET interface, enter the keyword sonet followed by 
the slot/port information.
• For a 10-Gigabit Ethernet interface, enter the keyword 
TenGigabitEthernet followed by the slot/port 
information.
• For a 1-Gigabit Ethernet interface, enter the keyword 
GigabitEthernet followed by the slot/port information.
• For a 40-Gigabit Ethernet interface, enter the keyword 
fortyGigE followed by the slot/ port information.
Command Modes
• EXEC
• EXEC Privilege
Command History
Version 8.3.11.1 Introduced on the Z9000.
Version 8.3.12.0 Introduced on the S4810.
Legacy E-Series 
command.
Usage 
Information
The following describes the show fefd command shown in the Example below.
Field Description
Interface Displays the interfaces type and number.
Mode Displays the mode (aggressive or normal) or NA if the interface 
contains fefd reset in its configuration.
Interval Displays the interval between FEFD packets.
State Displays the state of the interface and can be one of the following:
• bi-directional (interface is up and connected and ing 
neighbor’s echoes).
• err-disabled (only found when the FEFD mode is aggressive 
and when the interface has not n its neighbor’s echoes for 3 
953