26
Field Description
Protocol
Protocol connection state of the interface, which can be UP, DOWN, or
UP(s).
Main IP
The main IP address of the interface.
Description
Description of the interface.
Cause
The 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.
display interface null
Syntax
display interface
[
null
] [
brief
[
down
] ] [
|
{
begin
|
exclude
|
include
}
regular-expression
]
display interface
null
0
[
brief
] [
|
{
begin
|
exclude
|
include
}
regular-expression
]
View
Any view
Default level
1: Monitor level
Parameters
0
: Specifies interface Null 0. The null interface number is fixed at 0.
brief
: Displays brief interface information. If you do not specify this keyword, this command displays
detailed interface information.
down
: Displays information about interfaces in the 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.
Description
Use
display interface null
to display information about the null interface. Since 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.
•
If you do not specify the
null
keyword, this command displays information about all interfaces on
the device.
•
If you specify the
null
keyword, this command displays information about interface Null 0 with or
without the
0
keyword, because the device supports only one interface Null 0.
Related commands:
interface null
.