Default Interface Command on CISCO Router/Switch

Command

Default Interface

Use

This command allows you to quickly revert an interface back to its default configuration.
If you have a lot of changes, this is much faster than using the no version of every command on the interface.

Syntax

Router(config)#default interface <interface>

Example

In this example we will revert R1’s Fa0/0 interface back to its default configuration.

First lets have a look at Fa0/0’s current config.

R1(config)#do show run int fa0/0
Building configuration…

Current configuration : 210 bytes
!
interface FastEthernet0/0
description “This is a description”
bandwidth 100000
ip address 10.1.1.1 255.255.255.0
ip nat inside
ip virtual-reassembly
ip ospf cost 1
delay 4
speed 100
full-duplex
end

R1(config)#

Now lets default the interface.

R1(config)#default interface fa0/0
Building configuration…

Interface FastEthernet0/0 set to default configuration
R1(config)#
*Mar 1 00:42:00.851: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 100: Neighbor 10.1.1.2 (FastEthernet0/0) is down: interface down

R1(config)#

R1(config)#do show run int fa0/0
Building configuration…

Current configuration : 73 bytes
!
interface FastEthernet0/0
no ip address
duplex auto
speed auto
end

R1(config)#

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