Command Reference Guide

3Com Router 3000 Ethernet Family
Command Reference Guide
Chapter 4 Fundamental Logical Interface
Configuration Commands
3Com Corporation
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4.6.3 interface loopback
Syntax
interface loopback number
undo interface loopback number
View
System view
Parameter
number: Number of the loopback interface, in the range 0 to 65535.
Description
Use the interface loopback command to create a loopback interface or its view.
Use the undo interface loopback command to delete the specified loopback
interface.
After created, the loopback interface keeps up until it is shutdown. As it has the
loopback feature, it is often used to improve reliability.
You can shut down a loopback interface using the shutdown command. When you do
this, “Line protocol current state :UP (spoofing)” is displayed describing the current
state of the link layer protocol on the interface.
Related command: display interface loopback.
Example
# Create loopback interface 5.
[3Com ] interface loopback 5
[3Com -LoopBack5]
4.6.4 interface null
Syntax
interface null 0
View
System view
Parameter
None