Cisco 850 Series and Cisco 870 Series Access Routers Software Configuration Guide

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1

Basic Router Configuration

This chapter provides procedures for configuring the basic parameters of your Cisco router, including

global parameter settings, routing protocols, interfaces, and command-line access. It also describes the

default configuration on startup.

Note

Individual router models may not support every feature described throughout this guide. Features not

supported by a particular router are indicated whenever possible.

This chapter contains the following sections:

•

Interface Port Labels

•

Viewing the Default Configuration

•

Information Needed for Configuration

•

Configuring Basic Parameters

•

Configuring Static Routes

•

Configuring Dynamic Routes

•

Configuring Enhanced IGRP

Each section includes a configuration example and verification steps, as available.

For complete information on how to access global configuration mode, see the

“Entering Global

Configuration Mode”

section in Appendix A, “Cisco IOS Basic Skills.” For more information on the

commands used in the following tables, see the Cisco IOS Release 12.3 documentation set.

Interface Port Labels

Table 1-1

lists the interfaces supported for each router and their associated port labels on the equipment.

Table 1-1

Supported Interfaces and Associated Port Labels by Cisco Router

Router

Interface

Port Label

Cisco 851

Fast Ethernet LAN

LAN (top), FE0–FE3 (bottom)

Fast Ethernet WAN

WAN (top), FE4 (bottom)

Wireless LAN

(no label)

Cisco 850 Series and Cisco 870 Series Access Routers Software Configuration Guide

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Chapter 1

Basic Router Configuration

Viewing the Default Configuration

Viewing the Default Configuration

When you first boot up your Cisco router, some basic configuration has already been performed. All of

the LAN and WAN interfaces have been created, console and VTY ports are configured, and the inside

interface for Network Address Translation has been assigned. Use the

show running-config

command

to view the initial configuration, as shown in

Example 1-1

.

Example 1-1

Cisco 851 Default Configuration on Startup

Router#

show running-config

Building configuration...

Current configuration : 1090 bytes

!

version 12.3

no service pad

service timestamps debug datetime msec

service timestamps log datetime msec

no service password-encryption

!

hostname Router

!

boot-start-marker

boot-end-marker

!

Cisco 871

Fast Ethernet LAN

FE0–FE3

Fast Ethernet WAN

FE4

Wireless LAN

LEFT, RIGHT/PRIMARY

USB

1–0

Cisco 857

Fast Ethernet LAN

LAN (top), FE0–FE3 (bottom)

ATM WAN

ADSLoPOTS

Wireless LAN

(no label)

Cisco 876

Fast Ethernet LAN

LAN (top), FE0–FE3 (bottom)

ATM WAN

ADSLoISDN

Wireless LAN

LEFT, RIGHT/PRIMARY

BRI

ISDN S/T

Cisco 877

Fast Ethernet LAN

LAN (top), FE0–FE3 (bottom)

ATM WAN

ADSLoPOTS

Wireless LAN

LEFT, RIGHT/PRIMARY

Cisco 878

Fast Ethernet LAN

FE0–FE3

ATM WAN

G.SHDSL

Wireless LAN

LEFT, RIGHT/PRIMARY

BRI

ISDN S/T

Table 1-1

Supported Interfaces and Associated Port Labels by Cisco Router (continued)

Router

Interface

Port Label

Cisco 850 Series and Cisco 870 Series Access Routers Software Configuration Guide

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Chapter 1

Basic Router Configuration

Viewing the Default Configuration

no aaa new-model

ip subnet-zero

!

ip cef

ip ips po max-events 100

no ftp-server write-enable

!

interface FastEthernet0

no ip address

shutdown

!

interface FastEthernet1

no ip address

shutdown

!

interface FastEthernet2

no ip address

shutdown

!

interface FastEthernet3

no ip address

shutdown

!

interface FastEthernet4

no ip address

duplex auto

speed auto

!

interface Dot11Radio0

no ip address

shutdown

speed basic-1.0 basic-2.0 basic-5.5 6.0 9.0 basic-11.0 12.0 18.0 24.0 36.0 48.0

54.0

rts threshold 2312

station-role root

!

interface Vlan1

no ip address

!

ip classless

!

no ip http server

no ip http secure-server

!

control-plane

!

line con 0

no modem enable

transport preferred all

transport output all

line aux 0

transport preferred all

transport output all

line vty 0 4

login

transport preferred all

transport input all

transport output all

!

end

Cisco 850 Series and Cisco 870 Series Access Routers Software Configuration Guide

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Chapter 1

Basic Router Configuration

Information Needed for Configuration

Information Needed for Configuration

You need to gather some or all of the following information, depending on your planned network

scenario, prior to configuring your network

•

If you are setting up an Internet connection, gather the following information:

Point-to-Point Protocol (PPP) client name that is assigned as your login name

PPP authentication type: Challenge Handshake Authentication Protocol (CHAP) or Password

Authentication Protocol (PAP)

PPP password to access your Internet service provider (ISP) account

DNS server IP address and default gateways

•

If you are setting up a connection to a corporate network, you and the network administrator must

generate and share the following information for the WAN interfaces of the routers:

PPP authentication type: CHAP or PAP

PPP client name to access the router

PPP password to access the router

•

If you are setting up IP routing:

Generate the addressing scheme for your IP network.

Determine the IP routing parameter information, including IP address, and ATM permanent

virtual circuits (PVCs). These PVC parameters are typically virtual path identifier (VPI), virtual

circuit identifier (VCI), and traffic shaping parameters.

Determine the number of PVCs that your service provider has given you, along with their VPIs

and VCIs.

For each PVC determine the type of AAL5 encapsulation supported. It can be one of the

following:

AAL5SNAP—This can be either routed RFC 1483 or bridged RFC 1483. For routed RFC 1483,

the service provider must provide you with a static IP address. For bridged RFC 1483, you may

use DHCP to obtain your IP address, or you may obtain a static IP address from your service

provider.

AAL5MUX PPP—With this type of encapsulation, you need to determine the PPP-related

configuration items.

•

If you plan to connect over an ADSL or G.SHDSL line:

Order the appropriate line from your public telephone service provider.

For ADSL lines—Ensure that the ADSL signaling type is DMT (also called ANSI T1.413) or

DMT Issue 2.

For G.SHDSL lines—Verify that the G.SHDSL line conforms to the ITU G.991.2 standard and

supports Annex A (North America) or Annex B (Europe).

Once you have collected the appropriate information, you can perform a full configuration on

your router, beginning with the tasks in the

“Configuring Basic Parameters”

section.