Specifications

A-4
Cisco AS5800 Operations, Administration, Maintenance, and Provisioning Guide
DOC-7810814=
Appendix A Advanced Quick Reference
Advanced Quick Reference Configurations
To Modify, Copy, & Paste
interface FastEthernet0/0/0
ip address 1.1.1.1 255.255.255.0
no ip directed broadcast
no ip mroute-cache
no cdp enable
exit
Loopback Interface
Loopback interface is a logical interface on the router that can be used for diagnostics and
troubleshooting purposes. It is also used to conserve address space so other physical interfaces can be
unnumbered to this interface. The state of the Loopback interface is always UP/UP.
Loopback Requisites
The following requisite is significant consideration to identify before configuring a loopback interface:
• IP configuration
Loopback Configuration
The following Cisco IOS CLI script serves as a sample loopback configuration or setup.
Sample Configuration
5800(config)# interface loopback0
5800(config-if)# ip address 2.2.2.2 255.255.255.255
5800(config-if)# no ip directed broadcast
5800(config-if)# exit
5800(config)#
Command Line Description
5800(config)# interface loopback0
Defines the interface type.
5800(config-if)# ip address 2.2.2.2 255.255.255.255
Assigns an IP address to the interface.
5800(config-if)# no ip directed broadcast
Disables the translation of directed broadcast to physical broadcasts.
5800(config-if)# exit
Exits this interface configuration mode to global configuration mode.
5800(config)#
Global configuration mode prompt.
To Modify, Copy, & Paste
interface loopback0
ip address 2.2.2.2 255.255.255.255
no ip directed broadcast
exit