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Field
Protocol: (s) - spoofing
Interface
Link
Protocol
Description
Cause
Related commands
interface loopback
•
•
reset counters interface loopback
display interface null
Use display interface null to display information about the null interface.
Syntax
display interface [ null [ 0 ] ] [ brief [ description ] ]
Views
Any view
Predefined user roles
network-admin
network-operator
Description
administrator. To recover its physical layer state, run the undo
shutdown command.
•
Stby—The interface is a standby interface. To view the primary
interface information, run the display interface-backup state
command.
Explains the Protocol field value.
(s) represents spoofing. If the data link layer protocol of an interface is up,
but its link is an on-demand link or is not present, the Protocol field
displays UP(s). This attribute is typical of interface Null 0, Inloopback 0,
and loopback interfaces.
Interface name.
Physical layer state of the interface:
•
UP—The interface is up.
•
DOWN—The interface is physically down.
•
ADM—The interface has been administratively shut down. To
recover its physical state, run the undo shutdown command.
•
Stby—The interface is a standby interface.
Data link layer protocol state of the interface.
Interface description configured by using the description command. If the
description keyword is not specified in the display interface brief
command, the Description field allows a maximum of 27 characters. If
the description keyword is specified in the display interface brief
command, the field displays the complete interface description.
Cause of the interface down event. If the interface has been shut down by
using the shutdown command, this field displays Administratively. To
restore the physical state of the interface, execute the undo shutdown
command.
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