Cisco Router 850 Series Software Configuration Guide
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CH A P T E R 1-1 Cisco 850 Series and Cisco 870 Series Access Routers Software Configuration Guide OL-5332-01 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. NoteIndividual 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 Ta b l e 1-1 lists the interfaces supported for each router and their associated port labels on the equipment. Ta b l e 1-1 Supported Interfaces and Associated Port Labels by Cisco Router RouterInterfacePort Label Cisco 851Fast Ethernet LAN LAN (top), FE0–FE3 (bottom) Fast Ethernet WANWAN (top), FE4 (bottom) Wireless LAN(no label)
1-2 Cisco 850 Series and Cisco 870 Series Access Routers Software Configuration Guide OL-5332-01 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 msecservice timestamps log datetime msec no service password-encryption !hostname Router ! boot-start-markerboot-end-marker ! Cisco 871Fast Ethernet LAN FE0–FE3 Fast Ethernet WANFE4 Wireless LANLEFT, RIGHT/PRIMARY USB1–0 Cisco 857Fast Ethernet LAN LAN (top), FE0–FE3 (bottom) AT M WA NADSLoPOTS Wireless LAN(no label) Cisco 876Fast Ethernet LAN LAN (top), FE0–FE3 (bottom) AT M WA NADSLoISDN Wireless LANLEFT, RIGHT/PRIMARY BRIISDN S/T Cisco 877Fast Ethernet LAN LAN (top), FE0–FE3 (bottom) AT M WA NADSLoPOTS Wireless LANLEFT, RIGHT/PRIMARY Cisco 878Fast Ethernet LAN FE0–FE3 AT M WA NG.SHDSL Wireless LANLEFT, RIGHT/PRIMARY BRIISDN S/T Table 1-1 Supported Interfaces and Associated Port Labels by Cisco Router (continued) Router Interface Port Label
1-3 Cisco 850 Series and Cisco 870 Series Access Routers Software Configuration Guide OL-5332-01 Chapter 1 Basic Router Configuration Viewing the Default Configuration no aaa new-modelip 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
1-4 Cisco 850 Series and Cisco 870 Series Access Routers Software Configuration Guide OL-5332-01 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.
1-5 Cisco 850 Series and Cisco 870 Series Access Routers Software Configuration Guide OL-5332-01 Chapter 1 Basi c Router Configuration Configuring Basic Parameters Configuring Basic Parameters To configure the router, perform one or more of these tasks: Configure Global Parameters Configure Fast Ethernet LAN Interfaces Configure WAN Interfaces Configuring a Loopback Interface Configuring Command-Line Access to the Router A configuration example is presented with each task to show the network configuration following completion of that task. Configure Global Parameters Perform these steps to configure selected global parameters for your router: CommandPurpose Step 1configure terminal Example: Router> enable Router# configure terminalRouter(config)# Enters global configuration mode, when using the console port. If you are connecting to the router using a remote terminal, use the following: telnet router name or address Login: login id Password: *********Router> enable Step 2hostname name Example: Router(config)# hostname Router Router(config)# Specifies the name for the router. Step 3enable secret password Example: Router(config)# enable secret cr1ny5ho Router(config)# Specifies an encrypted password to prevent unauthorized access to the router. Step 4no ip domain-lookup Example: Router(config)# no ip domain-lookup Router(config)# Disables the router from translating unfamiliar words (typos) into IP addresses. For complete information on the gl obal parameter commands, see the Cisco IOS Release 12.3 documentation set.
1-6 Cisco 850 Series and Cisco 870 Series Access Routers Software Configuration Guide OL-5332-01 Chapter 1 Basic Router Configuration Configuring Basic Parameters Configure Fast Ethernet LAN Interfaces The Fast Ethernet LAN interfaces on your router are automatically configured as part of the default VLAN and as such, they are not configured with individual addresses. Access is afforded through the VLAN. You may assign the interfaces to other VLANs if desired. For more information about creating VLANs, see Chapter 5, “Configuring a LAN with DHCP and VLANs.” Configure WAN Interfaces The Cisco 851 and Cisco 871 routers each have one Fast Ethern et interface for WAN connection. The Cisco 857, Cisco 877, and Cisco 878 routers each have one AT M interface for WAN connection. Based on the router model you have, configure the WAN interface(s) using one of the following procedures: Configure the Fast Ethernet WAN Interface Configure the ATM WAN Interface Configure the Fast Ethernet WAN Interface This procedure applies only to the Cisco 851 and Cisco 871 router models. Perform these steps to configure the Fast Ethernet interface, beginning in global configuration mode: CommandPurpose Step 1interface type number Example: Router(config)# interface fastethernet 4 Router(config-int)# Enters the configuration mode for a Fast Ethernet WAN interface on the router. Step 2ip address ip-address mask Example: Router(config-int)# ip address 192.168.12.2 255.255.255.0 Router(config-int)# Sets the IP address an d subnet mask for the specified Fast Ethernet interface. Step 3no shutdown Example: Router(config-int)# no shutdown Router(config-int)# Enables the Ethernet interface, changing its state from administratively down to administratively up. Step 4exit Example: Router(config-int)# exitRouter(config)# Exits configuration mode for the Fast Ethernet interface and returns to global configuration mode.
1-7 Cisco 850 Series and Cisco 870 Series Access Routers Software Configuration Guide OL-5332-01 Chapter 1 Basi c Router Configuration Configuring Basic Parameters Configure the ATM WAN Interface This procedure applies only to the Cisco 857, Cisco 876, Cisco 877 and Cisco 878 models. Perform these steps to configure the ATM interface, beginning in global configuration mode: CommandPurpose Step 1For the Cisco 878 model only: controller dsl 0 mode atm exit Example: Router(config)# controller dsl 0 Router(config-controller)# mode atmRouter(config-controller)# exit Router(config)# For routers using the G.SHDSL signaling, perform these commands. Ignore this step for routers using ADSL signaling. Step 2interface type number Example: Router(config)# interface atm0 Router(config-int)# Identifies and enters the configuration mode for an ATM interface. Step 3ip address ip-address mask Example: Router(config-int)# ip address 200.200.100.1 255.255.255.0 Router(config-int)# Sets the IP address and subnet mask for the ATM interface. Step 4no shutdown Example: Router(config-int)# no shutdown Router(config-int)# Enables the ATM 0 interface. Step 5exit Example: Router(config-int)# exitRouter(config)# Exits configuration mode for the ATM interface and returns to global configuration mode. Configure the Wireless Interface The wireless interface enables connection to the rout er through a wireless LAN connection. For more information about configuring a wireless connection, see Chapter 9, “Configuring a Wireless LAN Connection,” and the Cisco Access Router Wireless Configuration Guide .
1-8 Cisco 850 Series and Cisco 870 Series Access Routers Software Configuration Guide OL-5332-01 Chapter 1 Basic Router Configuration Configuring Basic Parameters Configuring a Loopback Interface The loopback interface acts as a placeholder for the static IP address and provides default routing information. For complete information on the loopback commands, see the Cisco IOS Release 12.3 documentation set. Perform these steps to conf igure a loopback interface: CommandPurpose Step 1interface type number Example: Router(config)# interface Loopback 0 Router(config-int)# Enters configuration mode for the loopback interface. Step 2ip address ip-address mask Example: Router(config-int)# ip address 10.108.1.1 255.255.255.0 Router(config-int)# Sets the IP address and subnet mask for the loopback interface. Step 3exit Example: Router(config-int)# exitRouter(config)# Exits configuration mode for the loopback interface and returns to global configuration mode. Configuration Example The loopback interface in this sample configuratio n is used to support Network Address Translation (NAT) on the virtual-template interface. This configuration example shows the loopback interface configured on the Fast Ethernet inte rface with an IP address of 200.200.100.1/24, which acts as a static IP address. The loopback interface po ints back to virtual-template1, which has a negotiated IP address. !interface loopback 0 ip address 200.200.100.1 255.255.255.0 ( static IP address) ip nat outside! interface Virtual-Template1 ip unnumbered loopback0no ip directed-broadcast ip nat outside !
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Cisco 850 Series and Cisco 870 Series Access Routers Software Configuration Guide
OL-5332-01
Chapter 1 Basic Router Configuration
Configuring Basic Parameters
Verifying Your Configuration
To verify that you have properly configured the loopback interface, enter the show interface loopback
command. You should see verification output similar to the following example.
Router# show interface loopback 0
Loopback0 is up, line protocol is up
Hardware is Loopback Internet address is 200.200.100.1/24
MTU 1514 bytes, BW 8000000 Kbit, DLY 5000 usec,
reliability 255/255, txload 1/255, rxload 1/255 Encapsulation LOOPBACK, loopback not set
Last input never, output never, output hang never
Last clearing of show interface counters never Queueing strategy: fifo
Output queue 0/0, 0 drops; input queue 0/75, 0 drops
5 minute input rate 0 bits/sec, 0 packets/sec 5 minute output rate 0 bits/sec, 0 packets/sec
0 packets input, 0 bytes, 0 no buffer
Received 0 broadcasts, 0 runts, 0 giants, 0 throttles 0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
0 packets output, 0 bytes, 0 underruns
0 output errors, 0 collisions, 0 interface resets 0 output buffer failures, 0 output buffers swapped out
Another way to verify the loopback interface is to ping it:
Router# ping 200.200.100.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 200.200.100.1, timeout is 2 seconds:!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 1/2/4 ms
Configuring Command-Line Access to the Router
Perform these steps to configure parameters to control access to the router, beginning in global
configuration mode.
CommandPurpose
Step 1line [aux | console | tty | vty] line-number
Example:
Router(config)# line console 0
Router(config)#
Enters line configuration mode, and specifies the
type of line.
This example specifies a console terminal for
access.
Step 2password password
Example:
Router(config)# password 5dr4Hepw3Router(config)#
Specifies a unique password for the console
terminal line.
1-10 Cisco 850 Series and Cisco 870 Series Access Routers Software Configuration Guide OL-5332-01 Chapter 1 Basic Router Configuration Configuring Basic Parameters For complete information about the command line commands, see the Cisco IOS Release 12.3 documentation set. Step 3login Example: Router(config)# loginRouter(config)# Enables password checking at terminal session login. Step 4exec-timeout minutes [seconds] Example: Router(config)# exec-timeout 5 30 Router(config)# Sets the interval that the EXEC command interpreter waits until user input is detected. The default is 10 minutes. Optionally, add seconds to the interval value. This example shows a timeout of 5 minutes and 30 seconds. Entering a timeout of 0 0 specifies never to time out. Step 5line [aux | console | tty | vty] line-number Example: Router(config)# line vty 0 4 Router(config)# Specifies a virtual terminal for remote console access. Step 6password password Example: Router(config)# password aldf2ad1 Router(config)# Specifies a unique password for the virtual terminal line. Step 7login Example: Router(config)# login Router(config)# Enables password checking at the virtual terminal session login. Step 8end Example: Router(config)# endRouter# Exits line configuration mode, and returns to privileged EXEC mode. Command Purpose