R211x-HP Flexfabric 11900 Layer 2 - LAN Switching Command Reference

57
Link: ADM - administratively down; Stby - standby
Protocol: (s) - spoofing
Interface Link Protocol Main IP Description
NULL0 UP UP(s) -- aaaaaaaaaaaaaaaaaaaaaaaaaaaaa
aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
For the command output, see Table 15 and Table 16.
Related commands
• interface null
• reset counters interface null
interface loopback
Use interface loopback to create a loopback interface and enter loopback interface view.
Use undo interface loopback to remove a loopback interface.
Syntax
interface loopback interface-number
undo interface loopback interface-number
Default
No loopback interface exists.
Views
System view
Predefined user roles
network-admin
mdc-admin
Parameters
interface-number: Specifies a loopback interface by its number in the range of 0 to 1023.
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 establish a connection to a loopback interface to
prevent the connection from being affected by the physical state of the interface and to improve the
reliability of the connection. For example, you can configure a loopback interface as the source interface
for establishing an FTP connection or use the loopback interface address as the Router ID in BGP.
Examples
# Create interface loopback 1.
<Sysname> system-view
[Sysname] interface loopback 1
[Sysname-LoopBack1]
interface null
Use interface null to enter null interface view.