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C H A P T E R
1-1
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)
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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
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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
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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.

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