Reference Guide

422 | Interfaces
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To delete a Loopback interface, use the no interface loopback number command syntax in the
CONFIGURATION mode.
Many of the same commands found in the physical interface are found in Loopback interfaces.
See also Configuring ACLs to Loopback.
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:
The only configurable command in the INTERFACE mode of the Null interface is the
ip unreachable
command.
Port Channel Interfaces
Port channel interfaces support link aggregation, as described in IEEE Standard 802.3ad.
This section covers the following topics:
• Port channel definition and standards
• Port channel benefits
• Port channel implementation
• Configuration task list for port channel interfaces
Port channel definition and standards
Link aggregation is defined by IEEE 802.3ad as a method of grouping multiple physical interfaces into a
single logical interface—a Link Aggregation Group (LAG) or port channel. A LAG is “a group of links
that appear to a MAC client as if they were a single link” according to IEEE 802.3ad. In FTOS, a LAG is
referred to as a port channel interface.
A port channel provides redundancy by aggregating physical interfaces into one logical interface. If one
physical interface goes down in the port channel, another physical interface carries the traffic.
Command Syntax Command Mode Purpose
interface null 0
CONFIGURATION Enter the INTERFACE mode of the Null interface.