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Predefined user roles
network-admin
Parameters
interface-number: Specifies a loopback interface by its number in the range of 0 to 127.
Usage guidelines
The physical layer state and link layer protocols of a loopback interface are always up unless the
loopback interface is manually shut down. You can use a loopback interface to achieve the following
purposes:
• Prevent the connection from being affected by the physical state of the interface.
• Improve the reliability of the connection.
For example, you can:
• Configure a loopback interface as the source interface for establishing an FTP connection.
• Use the loopback interface address as the Router ID.
Examples
# Create interface loopback 1.
<Sysname> system-view
[Sysname] interface loopback 1
[Sysname-LoopBack1]
interface null
Use interface null to enter null interface view.
Syntax
interface null 0
Default
A device has only one null interface (Null 0), which cannot be created or deleted.
Views
System view
Predefined user roles
network-admin
Parameters
0: Specifies interface Null 0. The null interface number is always 0.
Examples
# Enter Null 0 interface view.
<Sysname> system-view
[Sysname] interface null 0
[Sysname-NULL0]
reset counters interface loopback
Use reset counters interface loopback to clear the statistics on the specified or all loopback
interfaces.
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