Specifications

3-27
Cisco AS5x00 Case Study for Basic IP Modem Services
11/24/1999
Section 3 Commissioning the Cisco AS5800 Hardware
Configuring Cisco IOS Basics
Step 2
Test the banner:
5800-NAS#
5800-NAS#login
This is a secured device.
Unauthorized use is prohibited by law.
User Access Verification
Username: admin
Password:
5800-NAS#
2.4 Configuring Basic IP
To commission a basic dial access service:

Configure two loopback interfaces.

Bring up one Fast Ethernet interface.

Add an IP route to the default gateway.
Step 1
Assign the IP addresses, and create an IP route to the default gateway:
!
interface Loopback0
ip address 172.22.99.1 255.255.255.255
!
interface Loopback1
ip address 172.22.90.1 255.255.255.0
!
interface FastEthernet0/1/0
ip address 172.22.66.23 255.255.255.0
!
ip route 0.0.0.0 0.0.0.0 172.22.66.1
!
The loopback interfaces are used for the following reasons:

Interface loopback 0—Identifies the router with a unique and stable IP address for network
management purposes. One IP address from a common address block is assigned to each network
device. This technique enables the network operations center (NOC) to more easily perform
security filtering. One class C subnet that used to identify devices can support 254 distinct nodes
with unique loopback IP addresses.

Interface loopback 1—Used to host a pool of IP addresses for the remote nodes. In this way, one
route is summarized and propagated to the backbone instead of 254 host routes.