Loopback Interfaces; Null Interfaces; Port Channel Interfaces - Dell Force10 S4810P Configuration Manual

Loopback Interfaces

A Loopback interface is a virtual interface in which the software emulates an interface. Packets routed to it
are processed locally. Since this interface is not a physical interface, you can configure routing protocols
on this interface to provide protocol stability. You can place Loopback interfaces in default Layer 3 mode.
To configure a Loopback interface, use the following command in the CONFIGURATION mode:
Command Syntax
interface loopback
To view Loopback interface configurations, use the
mode.
To delete a Loopback interface, use the
CONFIGURATION mode.
Many of the same commands found in the physical interface are found in Loopback interfaces.
See also Configuring ACLs to

Null Interfaces

The Null interface is another virtual interface created by the E-Series software. There is only one Null
interface. It is always up, but no traffic is transmitted through this interface.
To enter the INTERFACE mode of the Null interface, use the following command in the
CONFIGURATION mode:
Command Syntax
interface null 0
The only configurable command in the INTERFACE mode of the Null interface is the
command.

Port Channel Interfaces

Port channel interfaces support link aggregation, as described in IEEE Standard 802.3ad.
This section covers the following topics:
482
| Interfaces
Command Mode
CONFIGURATION
number
Loopback.
Command Mode
CONFIGURATION
Purpose
Enter a number as the loopback interface.
Range: 0 to 16383.
show interface loopback
no interface loopback
number
Purpose
Enter the INTERFACE mode of the Null interface.
command in the EXEC
number
command syntax in the
ip unreachable