Configuring the Router

When the following information is displayed, you have successfully booted the router:

System Bootstrap, Version X.X(Xa), SOFTWARE

Copyright (c) 19XX-19XX by Cisco Systems

2500 processor with 16384 Kbytes of main memory

Loading igs-c-l.110-0.7 at 0x3000040, size = 3865444 bytes [OK]

F3: 3779532+85880+173868 at 0x3000060

Restricted Rights Legend

Use, duplication, or disclosure by the Government is

subject to restrictions as set forth in subparagraph

(c) of the Commercial Computer Software - Restricted

Rights clause at FAR sec. 52.227-19 and subparagraph

(c) (1) (ii) of the Rights in Technical Data and Computer

Software clause at DFARS sec. 252.227-7013.

Cisco Systems, Inc.

170 West Tasman Drive

San Jose, California 95134-1706

Cisco Internetwork Operating System Software

IOS (tm) 3000 Software (IGS-C-L), Version 11.0(5), SOFTWARE

Copyright (c) 19XX-19XX by cisco Systems, Inc.

Compiled Mon 19-Jun-XX 23:22 by

Image text-base: 0x030200E4, data-base: 0x00001000

Cisco 2500 (68030) processor (revision C) with 16380K/2048K bytes of memory.

Processor board ID 2685538369

SuperLAT software copyright 1990 by Meridian Technology Corp).

TN3270 Emulation software (copyright 1994 by TGV Inc).

X.25 software, Version 2.0, NET2, BFE and GOSIP compliant.

Bridging software.

Authorized for Enterprise software set. (0x0)

1 Ethernet/IEEE 802.3 interface.

2 Serial network interfaces.

8 low-speed (sync/async) network interfaces.

32K bytes of non-volatile configuration memory.

4096K bytes of processor board System flash (Read ONLY)

Notice: NVRAM invalid, possibly due to write erase.

--- System Configuration Dialog ---

At any point you may enter a question mark '?' for help.

Use ctrl-c to abort configuration dialog at any prompt.

Default settings are in square brackets '[]'.

Step 3 Enter yes or press Return (the default) when you are asked if you would like to enter the configuration dialog and if you would like to see the current interface summary:

Would you like to enter the initial configuration dialog? [yes]:

First, would you like to see the current interface summary? [yes]:

Any interface listed with OK? value "NO" does not have a valid configuration

Interface IP-Address OK? Method Status Protocol

Ethernet0 unassigned NO not set up down

Serial0 unassigned NO not set down down

Serial1 unassigned NO not set down down

Serial2 unassigned NO not set down down

Serial3 unassigned NO not set down down

Step 4 Choose the supported protocols on the Ethernet or Token Ring interface. For IP-only installations, accept the default values for most of the questions.

A typical configuration using IP, IPX, and AppleTalk follows:

Configuring global parameters:

Enter host name [Router]: router

Step 5 Enter the enable secret password, the enable password, and the virtual terminal password:

The enable secret is a one-way cryptographic secret used

instead of the enable password when it exists.

Enter enable secret : shovel

The enable password is used when there is no enable secret

and when using older software and some boot images.

Enter enable password : trowel

Enter virtual terminal password: pail

Enter yes or no to accept or refuse SNMP management:

Configure SNMP Network Management? [yes]:no

The Simple Network Management Protocol (SNMP) is the most widely supported open standard for network management. It provides a means to access and set the configuration and run-time parameters of a multiport serial router. SNMP defines a set of functions used to monitor and control network elements.

Step 6 Determine if you are using DECnet on the router. If you are configuring for DECnet, enter the appropriate values for your area number, node number, and area routing:

Configure DECnet? [no]:

Step 7 In most cases, you use IP routing. For IP routing, you must also select one of two interior routing protocols: Interior Gateway Routing Protocol (IGRP) or Routing Information Protocol (RIP).

Enter yes or press Return (the default) to configure IP, and then select an interior routing protocol for IP:

Configure IP? [yes]:

Configure IGRP routing? [yes]:

Your IGRP autonomous system number [1]: 15

Configure CLNS? [no]:

Configure bridging? [no]:

Configure IPX? [no]: yes

Configure XNS? [no]:

Configure Apollo? [no]:

Step 8 Enter the ISDN BRI switch type for the router. The ISDN switch type appropriate for the router depends on the ISDN provider's equipment. Table 4-1 lists the ISDN switch types.

Enter ISDN BRI Switch Type [none]: basic-5ess

Table 4-1 ISDN Switch Types

Country:	ISDN Switch Type	Description
Australia	basic-ts013	Australian TS013 switches
Europe	basic-1tr6	German 1TR6 ISDN switches
	basic-nwnet3	Norwegian NET3 ISDN switches (phase 1)
	basic-net3	NET3 ISDN switches (UK and others)
	basic-net5	NET5 switches (UK and Europe)
	vn2	French VN2 ISDN switches
	vn3	French VN3 ISDN switches
	basic-1tr6	German 1TR6 ISDN switches
	basic-nwnet3	Norwegian NET3 ISDN switches (phase 1)
Japan	ntt	Japanese NTT ISDN switches
New Zealand	basic-nznet3	New Zealand NET3 switches
North America	basic-5ess	AT&T basic rate switches
	basic-dms100	NT DMS-100 basic rate switches
	basic-ni1	National ISDN-1 switches

Configuring the ISDN BRI Interface

This section explains how to configure the ISDN BRI interface. If an ISDN BRI WAN module is not installed in your router, skip this section and proceed with the next section, "Configuring the Ethernet or Token Ring Interfaces."

The ISDN BRI interface is configured to allow connection to ISDN WANs. Take the following steps to configure the ISDN BRI interface:

Step 1 Press Return or enter yes to configure the ISDN BRI port:

Configuring interface BRI0:

Is this interface in use? [yes]

Configure IP on this interface? [yes]

IP address for this interface: 172.16.71.1

Number of bits in subnet field [0]: 8

lass B network is 172.16.0.0, 8 subnet bits; mask is
255.255.255.0

Configure AppleTalk on this interface? [no]: yes

Extended AppleTalk network? [no]: yes

AppleTalk starting cable range [0]: 1

AppleTalk ending cable range [1]: 2

AppleTalk zone name [myzone]:

AppleTalk additional zone name: otherzone

AppleTalk additional zone name:

Configure IPX on this interface? [no]: yes

IPX network number [1]: B000

In this example, routing is enabled on AppleTalk and IPX; IP has already been selected:

Configure AppleTalk? [no]: yes

Multizone networks? [no]: yes

Configure LAT? [yes]: no

Configure IPX? [no]: yes

Configuring the Ethernet or Token Ring Interfaces

Take the following steps to configure the Ethernet or Token Ring interface to allow communication over a LAN. To configure the interface parameters, you need to know the Ethernet or Token Ring interface network addresses. In the following example, the system is being configured for an Ethernet LAN using IP.

Step 1 Respond as follows (using your own address and subnet bits) to the setup prompts:

Configuring interface Ethernet0:

Is this interface in use? [yes]:

Configure IP on this interface? [yes]:

IP address for this interface: 172.16.72.1

Number of bits in subnet field [0]: 8

Class B network is 172.16.0.0, 8 subnet bits; mask is 255.255.255.0

Step 2 Enter yes if you are using AppleTalk on the interface, enter yes to configure for extended AppleTalk networks, and then enter the cable range number. Enter the zone name, and any other additional zones that are associated with the local zone:

Configure AppleTalk on this interface? [no]: yes

Extended AppleTalk network? [no]: yes

AppleTalk starting cable range [0]: 1

AppleTalk ending cable range [1]: 2

AppleTalk zone name [myzone]:

AppleTalk additional zone name: otherzone

AppleTalk additional zone name:

Step 3 If IPX is enabled on this interface, enter the unique IPX network number:

Configure IPX on this interface? [no]: yes

IPX network number [1]: B001

Configure XNS on this interface? [no]

Configuring the Synchronous Serial Interfaces

The synchronous serial interfaces are configured to allow connection to WANs through a CSU/DSU. All serial ports on the multiport serial router are initially configured as synchronous ports. When the initial configuration is completed, configure the serial ports you plan to use as asynchronous ports using the physical-layer command in configuration mode. Take the following steps to configure the serial port(s):

Step 1 Enter yes to configure serial port 0:

Configuring interface Serial0:

Is this interface in use? [no]: yes

Step 2 Determine what protocols you want on the synchronous serial interface and enter the appropriate responses:

Configure IP unnumbered on this interface? [no]: no

IP address for this interface: 172.16.73.1

Number of bits in subnet field [8]:

Class B network is 172.16.0.0, 8 subnet bits; mask is 255.255.255.0

Configure AppleTalk on this interface? [no]: yes

Extended AppleTalk network? [yes]:

AppleTalk starting cable range [2]: 3

AppleTalk ending cable range [3]: yes

AppleTalk zone name [myzone]: ZZ Serial

AppleTalk additional zone name:

Configure IPX on this interface? [no]: yes

IPX network number [2]: B000

Step 3 Configure the second synchronous serial interface:

Configuring interface Serial1:

Is this interface in use? [no]: yes

Configure IP unnumbered on this interface? [no]: yes

IP address for this interface: 172.16.74.2

Number of bits in subnet field [8]:

Class B network is 172.16.0.0, 8 subnet bits; mask is 255.255.255.0

Configure AppleTalk on this interface? [no]: yes

Extended AppleTalk network? [yes]:

AppleTalk starting cable range [2]: 4

AppleTalk ending cable range [3]: 4

AppleTalk zone name [myzone]: ZZ Serial

AppleTalk additional zone name:

Configure IPX on this interface? [no]: yes

IPX network number [2]: B002

Step 4 Continue to configure the remaining serial port(s) using similar parameters.

The multiport serial router is now configured properly and is ready to use. Enter the setup command to modify the parameters after the initial configuration. Enter the configure command to perform more complex configurations. For additional information, refer to the publication Cisco IOS command reference publication.

Step 5 Check the router settings by entering the show running-config command at the enable prompt:

Router# show running-config

.

.

.

configuration register is 0x2102

Step 6 Store the configuration, or changes to the startup configuration, by entering the copy running-config startup-config command at the enable prompt:

Router# copy running-config startup-config

Entering this command saves the configuration settings that the setup process created in the router. If you fail to do this, the configuration is lost the next time the router is loaded.

Setting Asynchronous Serial Ports

The ports you plan to use as low-speed asynchronous serial ports must be reconfigured after the initial setup because the ports are initially configured as low-speed synchronous serial ports.

Take the following steps to configure a synchronous serial port to be an asynchronous serial port:

Step 1 Connect a terminal by following the instructions in the section "Connecting the Console Terminal and Modem" in the chapter "Installing the Router" and then power up the router.

Step 2 Enter the config terminal command at the enable prompt to enter configuration mode:

router# config terminal

You can now make changes to the configuration. Press Ctrl-Z to exit configuration mode.

Step 3 Enter the interface command to select the port you are configuring:

interface serial 2

Step 4 Enter the physical-layer command to change the port to asynchronous:

physical-layer async

Step 5 Enter the IP address, the asynchronous mode, and routing method:

ip address 172.16.2.2 255.0.0.0

async mode dedicated

async default routing

Setting Synchronous Serial Ports

Take the following steps to configure a low-speed asynchronous serial port to be a low-speed synchronous serial port:

Step 1 Connect a terminal by following the instructions in the section "Connecting the Console Terminal and Modem" in the chapter "Installing the Router" and then power up the router.

Step 2 Enter the config terminal command at the enable prompt to enter configuration mode:

Router# config terminal

You can now make changes to the configuration. Press Ctrl-Z to exit configuration mode.

Step 3 Enter the interface command to select the port you are configuring:

interface serial 2

Step 4 Enter the physical-layer command to set the port to synchronous:

physical-layer sync

Setting Half-Duplex Mode

Low-speed serial ports that are set as DCE can be set to use either controlled carrier mode or constant carrier mode.

Controlled carrier mode sets the interface to deactivate DCD until a transmission is sent to the interface. DCD is then activated, and the interface waits an amount of time you configure, and then transmits the data. After the transmission, the interface waits for a period of time and then deactivates DCD.

Constant carrier mode (the default for low-speed interfaces) activates DCD at all times.

Take the following steps to enable controlled carrier mode:

Step 1 Connect a terminal by following the instructions in the section "Connecting the Console Terminal and Modem" in the chapter "Installing the Router" and then power up the router.

Step 2 Enter the config terminal command at the enable prompt to enter configuration mode:

Router# config terminal

You can now make changes to the configuration. Press Ctrl-Z to exit configuration mode.

Step 3 Enter the half-duplex command to reset the port from constant carrier mode to controlled carrier mode:

interface serial 2

half-duplex controlled carrier

Step 4 Enter the no half-duplex command to return to constant carrier mode:

interface serial 2

no half-duplex controlled carrier

Step 5 Enter the half-duplex timer command to specify the time that the interface delays when in controlled carrier mode. For example, to configure the DCD drop delay, enter the following commands, using appropriate values for your system:

interface serial 2

half-duplex timer dcd-drop-delay 100 ms

The amount of time is specified in milliseconds.

Step 6 Enter the timer command to tailor the delay times for the router ports. Table 4-2 lists the timer commands and their default settings.

Table 4-2 Half-Duplex Timer Commands

Timer	Syntax	Default Setting (Milliseconds)
CTS delay	half-duplex timer cts-delay	100
CTS drop timeout	half-duplex timer cts-drop-timeout	5000
DCD drop delay	half-duplex timer dcd-drop-delay	100
DCD transmission start delay	half-duplex timer dcd-txstart-delay	100
RTS drop delay	half-duplex timer rts-drop-delay	100
RTS timeout	half-duplex timer rts-timeout	2000
Transmit delay	half-duplex transmit-delay	0

Specifying the Boot Method

You can enter multiple boot commands in the configuration in NVRAM to provide backup methods for loading the Cisco IOS image onto the router. The router boots using the first boot command that succeeds. If you enter multiple boot commands, the router executes them in the order they are entered. There are two ways to load the Cisco IOS image: from Flash memory or from a TFTP server on the network.

1. Flash memory
   

Information stored in Flash memory is not vulnerable to network failures that might occur when you load system software from servers. In the following example, replace filename with the filename of the Cisco IOS image:

Router> enable
Password: enablepassword
Router# configure terminal
Router (config)# boot system flash filename
Router (config)# Ctrl-Z
Router# copy running-config startup-config
Building configuration ...
[OK]
Router# exit
Router>

1. TFTP server
   

If Flash memory is not available, or if Flash memory does not contain a valid Cisco IOS image, you can specify that system software be loaded from a TFTP server on your Ethernet network as a backup boot method for the router. In the following example, replace filename with the filename of the Cisco IOS image, and replace ipaddress with the IP address of the TFTP server:

Router> enable
Password: enablepassword
Router# configure terminal
Router (config)# boot system tftp filename ipaddress
Router (config)# Ctrl-Z
Router# copy running-config startup-config
Building configuration ...
[OK]
Router# exit
Router>

For more information about the configure terminal command, refer to the command reference publication.

Checking the Configuration Settings

Enter the show version command to check the software version (third line from the top in the following display) and configuration register setting (at the end of the following display):

Router> show version
Cisco Internetwork Operating System Software
IOS (tm) XX00 Software (XXX-X-X), RELEASE SOFTWARE XX.X(XXXX) [XXX]
Copyright (c) 1986-199X by cisco Systems, Inc.
Compiled Tue XX-XXX-XX 13:07 by XXXXX
Image text-base: 0x03032810, data-base: 0x00001000

ROM: System Bootstrap, Version X.X(XXXX) [XXXXX], RELEASE SOFTWARE
ROM: XX00 Bootstrap Software (XXX-BOOT-X), Version XX.X(XXXXX) [XXXXX]

Router uptime is 4 minutes
System restarted by power-on
System image file is "flash:XXX/XXX-X-X.Nov14", booted via flash

cisco XXXX(68030) processor (revision X) with 4092K/2048K bytes of memory.
Processor board ID 00000000
Bridging software.
SuperLAT software copyright 199X by Meridian Technology Corp).
X.25 software, Version X.X, NET2, BFE and GOSIP compliant.
TN3270 Emulation software (copyright 199X by TGV Inc).
1 Ethernet/IEEE 802.3 interface.
2 Serial network interfaces.
No module installed for Serial Interface 0

No module installed for Serial Interface 1
32K bytes of non-volatile configuration memory.
8192K bytes of processor board System flash (Read ONLY)

Configuration register is 0x2102

Router>

Getting More Information

For more information about router software configuration, refer to the Cisco IOS configuration guide and command reference publications. These publications are available on the documentation CD that accompanied your router. To order the documentation CD, or paper documentation, refer to the information packet publication that accompanied your router.

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