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applying an ACL. For example, if you specify a null interface as the next hop of a static route to a
network segment, any packets routed to the network segment are dropped.
To configure a null interface:
Step Command
Remarks
1.
Enter system view.
system-view
N/A
2.
Enter null interface view.
interface null 0
Interface Null 0 is the default null
interface on the device and cannot
be manually created or removed.
Only one null interface, Null 0, is
supported on the device. The null
interface number is always 0.
3.
Configure the interface
description.
description text
The default setting is NULL0
Interface.
4.
Restore the default settings
for the null interface.
default
N/A
Configuring an inloopback interface
An inloopback interface is a virtual interface created by the system, which cannot be configured or
deleted. The physical layer and link layer protocol states of an inloopback interface are always up. All
IP packets sent to an inloopback interface are considered packets sent to the device itself and are
not forwarded.
Displaying and maintaining loopback, null, and
inloopback interfaces
Execute
display
commands in any view and
reset
commands in user view.
Task Command
Display information about the specified or all
loopback interfaces.
display interface loopback
[
interface-number
] [
brief
[
description
|
down
] ]
Display information about the null interface.
display interface null
[
0
] [
brief
[
description
|
down
] ]
Display information about the inloopback
interface.
display interface inloopback
[
0
] [
brief
[
description
|
down
] ]
Clear the statistics on the specified or all loopback
interfaces.
reset counters interface
loopback
[
interface-number
]
Clear the statistics on the null interface.
reset counters interface
null
[
0
]
