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# Display information about all loopback interfaces in down state and the causes.
<Sysname> display interface loopback brief down
Brief information on interfaces in route mode:
Link: ADM - administratively down; Stby - standby
Interface Link Cause
Loop1 ADM Administratively
Table 12 Command output
Field Description
Link
Physical link state of the interface:
• UP—The interface is physically up.
• DOWN—The interface is physically down.
• ADM—The interface has been shut down by using the
shutdown command. To restore the physical state of the
interface, use the undo shutdown command.
• Stby—The interface is a backup interface in standby state.
Protocol
Data link layer protocol state of the interface, which is always
UP(s)
.
UP(s)
represents that the data link layer protocol of the interface is up,
but the link is an on-demand link or does not exist. The
(s)
attribute
represents the spoofing flag. This value is typical of null interfaces and
loopback interfaces.
Primary IP Primary IP address of the interface.
Description Description of the interface.
Cause
Cause for the physical link state of the interface to be
DOWN
.
Administratively
represents that the interface has been manually
shut down by using the
shutdown
command. To restore the
physical state of the interface, use the
undo shutdown
command.
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 | down ] ]
Views
Any view
Predefined user roles
network-admin
network-operator
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