Specifications

Loopback Interface Configuration Command Set Command Reference Guide

ip ospf authentication [message-digest | null]

Use the ip ospf authentication command to authenticate an interface that is performing OSPF

authentication.

Syntax Description

message-digest

*Optional

Select message-digest authentication type.

null

*Optional

Select for no authentication to be used.

Default Values

By default, this is set to null (meaning no authentication is used).

Command Modes

(config-interface)# Interface Configuration Mode

Valid interfaces include: Ethernet (eth 0/1), virtual PPP interfaces (ppp 1), virtual

frame relay sub-interfaces (fr 1.20), and loopback interfaces

Command History

Release 3.1 Command was introduced

Usage Examples

The following example specifies that no authentication will be used on the loopback interface:

(config-loop 1)#

ip ospf

authentication null