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Field Description
Protocol
Data link layer protocol state of the interface.
Main IP
Main IP address of the interface.
Description
Description of the interface.
Cause
Cause of a down physical link. If the port has been shut down
with the
shutdown
command, this field displays
Administratively
.
To restore the physical state of the interface, use the
undo
shutdown
command.
Related commands
interface loopback
display interface null
Use
display interface null
to display information about the null interface. Because Null 0 interface is the
only null interface on a device, this command displays information about Null 0 interface even if you do
not specify the
0
keyword.
Syntax
display interface
[
null
] [
brief
[
down
] ] [
|
{
begin
|
exclude
|
include
}
regular-expression
]
display interface
null
0
[
brief
] [
|
{
begin
|
exclude
|
include
}
regular-expression
]
Views
Any view
Default command level
1: Monitor level
Parameters
0
: Specifies interface Null 0. The null interface number is always 0, because the device has only one null
interface.
brief
: Displays brief interface information. If you do not specify this keyword, this command displays
detailed interface information.
down
: Displays information about interfaces in down state and the causes. If you do not specify this
keyword, this command displays information about interfaces in all states.
|
: Filters command output by specifying a regular expression. For more information about regular
expressions, see
Fundamentals Configuration Guide
.
begin
: Displays the first line that matches the specified regular expression and all lines that follow.
exclude
: Displays all lines that do not match the specified regular expression.
include
: Displays all lines that match the specified regular expression.
regular-expression
: Specifies a regular expression, a case-sensitive string of 1 to 256 characters.
Usage guidelines
If you do not specify the
null
keyword, this command displays information about all interfaces on the
device.
