Cisco Systems Network Router 2948G L3 User Manual

C H A P T E R

Configurations for the Layer 3 Switch Router

This chapter describes the initial configuration of the Layer 3 switch router and contains the following

major sections:

•

Starting Up the Layer 3 Switch Router, page 3-1

Using the Console and the Management Ports, page 3-2

Configuring the Management Port, page 3-3

Configuring the Hostname, page 3-5

Using the Bootflash Memory SIMM, page 3-5

Recovering a System Image Using Xmodem and Ymodem, page 3-10

Updating the System Image, page 3-13

This chapter takes you through Step 2 of the suggested process for configuring your Layer 3 switch

router (see the “Preparing to Configure the Layer 3 Switch Routers” section on page 2-1).

Note

You should have already set up the hardware before proceeding with the initial Layer 3 switch router

configuration.

Starting Up the Layer 3 Switch Router

Note

You must complete the tasks described here before configuring your Layer 3 switch router.

This section lists the tasks you should have completed during hardware installation, including starting

up the Layer 3 switch router. You should have:

•

Verified that the Layer 3 switch router is set for the correct AC (or DC) power voltages.

Refer to the Catalyst 2948G-L3 Hardware Installation Guide or the Catalyst 4908G-L3 Hardware

Installation Guide for correct power voltages.

•

Connected the cables to the Layer 3 switch router.

Connected the console terminal to the Layer 3 switch router.

Powered up the Layer 3 switch router.

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Chapter 3 Configurations for the Layer 3 Switch Router

Configuring the Management Port

file transfer. The maximum file transfer speed supported is 57600 baud. This functionality primarily

serves as a disaster recovery technique in which you recover system images using Xmodem and

Ymodem commands on the ROM monitor from the console port on your Layer 3 switch router.

For more information on recovering a system image, see the “Recovering a System Image Using

Xmodem and Ymodem” section on page 3-10.

Passwords

There are two types of passwords that you can configure: an enable password and an enable secret

password. For maximum security, make the enable password different from the enable secret password.

•

Enable password—The enable password is a nonencrypted password. It can contain any number of

uppercase and lowercase alphanumeric characters. Give the enable password only to users permitted

to make configuration changes to the Layer 3 switch router.

•

Enable secret password—The enable secret password is a secure, encrypted password. By setting an

encrypted password, you can prevent unauthorized configuration changes. On systems running

Cisco IOS software, you enter the enable secret password before you can access global configuration

mode.You enter the enable secret password to access boot ROM software.

An enable secret password can contain from 1 to 25 uppercase and lowercase alphanumeric

characters. The first character cannot be a number. Spaces are valid password characters. Leading

spaces are ignored; trailing spaces are recognized.

You will configure passwords in the next section, “Configuring the Management Port.”

Configuring the Management Port

The management port on the Layer 3 switch router allows multiple simultaneous Telnet or SNMP

network management sessions. Since there is no separate management port on Layer 3 switch routers,

you can configure any Fast Ethernet or Gigabit Ethernet port as a management port.

You can remotely configure the Layer 3 switch router through the management port, but first you must

configure an IP address so that the Layer 3 switch router is reachable. You can manually configure the

management port interface from the CLI.

Note

Before you begin configuring the management port interface manually, get the Layer 3 switch router

IP address and IP subnet mask. Also make sure the console cable is connected to the console port.

You can configure the management port from an IP-connected network.

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Chapter 3 Configurations for the Layer 3 Switch Router

Configuring the Management Port

To configure Telnet for remote management access, perform the following procedure, beginning in user

EXEC mode:

Command

Purpose

Step 1

Step 2

Router> enable

Router#

Enter user EXEC (or enable) mode.

The # prompt indicates enable mode.

Router# configure terminal

Router(config)#

Enter global configuration mode. You can also

abbreviate the command to config terminal. The

Router(config)# prompt indicates that you are in global

configuration mode.

Step 3

Step 4

Router(config)# enable

password password

Set the enable password. See the “Passwords” section on

page 3-3.

Router(config)# enable secret password

Enter an enable secret password. A user must enter the

enable secret password to gain access to global

configuration mode.

Step 5

Step 6

Router(config)# interface type number

Enter interface configuration mode on the Ethernet

interface.

Router(config-if)#

Router(config-if)# ip address ip-address Enter the IP address and IP subnet mask for the interface

subnetmask

specified in Step 5.

Step 7

Step 8

Router(config-if)# no shutdown

Router(config-if)# exit

Router(config)#

Enable the interface.

Return to global configuration mode.

Step 9

Router(config)# line vty line-number

Router(config-line)#

Enter line configuration mode for virtual terminal

connections. Commands entered in this mode control the

operation of Telnet sessions to the Layer 3 switch router.

Step 10

Step 11

Router(config-line)# password password Enter a password for Telnet sessions.

Router(config-line)# end

Return to privileged EXEC mode.

Router#

Step 12

Router# copy running-config

Save your configuration changes to NVRAM.

startup-config

Note

Any Fast Ethernet interface 1–48 and any Gigabit Ethernet interface 49–50 on the

Catalyst 2948G-L3 switch router, or any Gigabit Ethernet interface 1–8 on the Catalyst 4908G-L3

switch router, can be configured as a management port.

Once you have completed configuring remote mangement on the management port, you can use Telnet

to remotely assign and verify configurations.

You can display the configuration file when you are in privileged EXEC (enable) mode.

•

To see the current operating configuration, enter the following command at the enable prompt:

Router# show running-config

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Chapter 3 Configurations for the Layer 3 Switch Router

Configuring the Hostname

•

To see the configuration in NVRAM, enter the following command:

Router# show startup-config

If you made changes to the configuration, but did not write the changes to NVRAM, the results of

show running-config will differ from the results of the show startup-config command.

Configuring the Hostname

In addition to the system passwords and enable password, your initial configuration should include the

hostname to make it easier to configure and troubleshoot the Layer 3 switch router. To configure the

hostname, perform the following task, beginning in enable mode:

Command

Purpose

Step 1

Router# configure terminal

Router(config)#

Enter global configuration mode.

Step 2

Step 3

Router(config)# hostname name-string

Enter a system name. In this example, we set

the hostname to “Router.”

Router(config)# end

Return to privileged EXEC mode.

Router#

Step 4

Router# copy running-config startup-config Copy your configuration changes to NVRAM.

Using the Bootflash Memory SIMM

The Catalyst 2948G-L3 and Catalyst 4908G-L3 switch routers use the onboard bootflash memory as the

file storage system. The bootflash memory single inline memory module (SIMM) stores a copy of the

Layer 3 switch router’s software image. The following sections describe how to use the bootflash

memory SIMM to perform system administration:

•

Viewing the Contents of Bootflash Memory, page 3-5

Deleting Files from Bootflash Memory, page 3-6

Backing Up a System Image to a TFTP Server, page 3-6

Copying a System Image from a TFTP Server to a Bootflash Memory SIMM, page 3-7

Erasing Files from a Full Bootflash Memory SIMM, page 3-8

Viewing the Contents of Bootflash Memory

You can perform the following tasks to view the contents of the onboard bootflash memory SIMM:

•

To determine which file system device you are accessing, enter the print working directory (pwd)

command.

Router# pwd

bootflash:

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Using the Bootflash Memory SIMM

•

To list the directory contents of any bootflash memory media, enter the dir [bootflash:] command.

Router# dir

Directory of bootflash:/

1 -rw-

2 -rw-

3153784

3153932

<no date> cat2948g-in-mz.old

<no date> cat2948g-in-mz

16777216 bytes total (7315372 bytes free)

Router#

Deleting Files from Bootflash Memory

When you delete a file from bootflash memory, the system marks the file as deleted. Deleted files cannot

be recovered. The bootflash memory is not released after the image file has been deleted; only the image

file is marked as deleted.

Caution

When deleting files from memory, be careful not to delete all the system images. You should always

retain one known good image as a backup image.

To delete a file, enter the delete command. The following example shows how to delete a specified image

file using the delete command:

Router# delete cat2948g-in-mz.old

Delete filename [cat2948g-in-mz.old]?

Delete bootflash:cat2948g-in-mz.old? [confirm]

Router# dir

Directory of bootflash:/

2 -rw-

3153932

<no date> cat2948g-in-mz

16777216 bytes total (7315372 bytes free)

Backing Up a System Image to a TFTP Server

To create a backup copy of your system image, you can copy system images from bootflash memory to

a Trivial File Transfer Protocol (TFTP) server.

In some implementations of TFTP, you must create a dummy file on the TFTP server and give it read,

write, and execute permissions before copying the file over it. Refer to your TFTP documentation for

more information.

Tip

Before you copy software between the network server and bootflash memory in the Layer 3 switch

router, do the following:

– Make sure that you have access to the network server and that you know its IP address and name.

– Verify that the server has sufficient room to accommodate the Cisco IOS software image.

– Check the filename requirements and verify that there is enough file space on the network server.

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Chapter 3 Configurations for the Layer 3 Switch Router

Using the Bootflash Memory SIMM

To create a backup of the system software on a TFTP server, perform the following task, beginning in

privileged EXEC mode:

Command

Purpose

Step 1

Step 2

Router# dir bootflash:

Display the contents of bootflash memory,

including the names of the images that

currently reside there.

Note the name of the image file you want to

copy.

Router# copy bootflash: tftp:

Copy a file from bootflash memory to a TFTP

server. Be sure to include a colon at the end of

the tftp keyword, as shown in this example.

The following example demonstrates how to copy a specified system image file from the bootflash

memory to the default TFTP server:

Router# copy bootflash: tftp:

Source filename []? cat2948g-in-mz.120-7.W5.14.46

Address or name of remote host []? 171.10.0.111

Destination filename [cat2948g-in-mz.120-7.W5.14.46]? yes

!!.!.!!!!!!!!!.!!!!!!!!!.!.!!!!!!!!!.!.!!.!.!!!!!!!!!.!.!.!!!!!!!!!.!!!!!!!!!.!!

!!!!!!!!.!.!!!!!!!!!.!!!!!!!!!!.!!!!!!!!!.!!!!!!!!!.!!!!!!!!!.!.!.!!!!!!!!!.!!.!

!!!!!!!!.!.!.!.!!!!!!!!!.!.!!.!.!!!!!!!!!.!!!!!!!!!.!.!!!!!!!!!!.!!!!!!!!!.!.!.!

!!!!!!!!.!!!!!!!!!.!!!!!!!!!.!!.!.!!!!!!!!!.!!.!.!.!!!!!!!!!!.!!!!!!!!!.!.!!.!!!

!!!!!!.!.!.!.!.!!!!!!!!!.!!.!.!.!!!!!!!!!.!!!!!!!!!!.!!!!!!!!!.!.!!.!!!!!!!!!.!!

!!!!!!!!.!.!.!.!!!!!!!!!.!!!!!!!!!.!.!!.!.!!!!!!!!!.!!.!.!.!.!!!!!!!!!!.!!!!!!!!

!.!.!!.!!!!!!!!!.!.!!!!!!!!!!.!!!!!!!!!.!!.!!!!!!!!!.!.!.!!!!!!!!!.!.!.!!!!!!!!!

!!!!!!!!.!!!!!!!!!.!.!.!!!!!!!!!.!!.!.!!!!!!!!!.!!.!.!.!!!!!!!!!.!!.!.!.!.!.!!!!

!!!

3173364 bytes copied in 743.840 secs (4271 bytes/sec)

Copying a System Image from a TFTP Server to a Bootflash Memory SIMM

You can copy system image files from a TFTP server to the bootflash memory SIMM for use in booting

the Layer 3 switch router.

It is a good idea to have a copy of the current system image on the bootflash memory SIMM in case the

new image file that you copy from the TFTP server is corrupted.

Note

You can also create a backup copy of your system image by copying the system image from bootflash

memory to a TFTP server. You can maintain a known good image as a backup image on the TFTP

server. If the new image file you copy from the TFTP server is corrupted, you can retrieve the known

good backup copy of the system image file from the TFTP server.

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Chapter 3 Configurations for the Layer 3 Switch Router

Using the Bootflash Memory SIMM

To copy the system image from the TFTP server to a bootflash memory SIMM, perform the following

procedure, beginning in privileged EXEC mode:

Command

Purpose

Step 1

Step 2

Router# dir bootflash:

Display the contents of bootflash memory,

including the names of the images that

currently reside there.

Router# copy tftp: bootflash:

Copy a file from a TFTP server to bootflash

memory.

The following example demonstrates how to copy a system image from the TFTP server to the bootflash

memory SIMM without erasing the previous image file.

Note

To retain existing images on the bootflash memory, enter no when you are prompted to confirm

erasing bootflash memory.

Router# copy tftp: bootflash:

Address or name of remote host [172.10.00.00]?

Source filename [domino/cat2948g-in-mz.120-7.W5.14.45]? domino/cat2948g-in-mz.12

0-7.W5.14.46

Destination filename [cat2948g-in-mz.120-7.W5.14.46]?

Accessing tftp://172.10.00.00/domino/cat2948g-in-mz.120-7.W5.14.46...

Erase bootflash: before copying? [confirm] no

Loading domino/cat2948g-in-mz.120-7.W5.14.46 from 172.10.00.00 (via FastEthernet

1): !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!.!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

!!!!!!!!!!.!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!.!!!!!!!!!!!!!

!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!.!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

!!!!!!!!!!!.!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!.!!!!!!!!!!!!!!!

!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!.!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

!!!!!!!!.!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!.!!!!!!!!!!!!!!!!!

!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!.!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

!!!!!!!!!!!!.!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!.!!!!!!!!!!!!!!!!

[OK - 3173364/6345728 bytes]

Verifying checksum... OK (0x755F)

3173364 bytes copied in 210.364 secs (15111 bytes/sec)

Router# dir bootflash:

Directory of bootflash:/

1 -rw-

2 -rw-

3173128

3173364

<no date> cat2948g-in-mz.120-7.W5.14.45

<no date> cat2948g-in-mz.120-7.W5.14.46

16777216 bytes total (10430596 bytes free)

Erasing Files from a Full Bootflash Memory SIMM

If the bootflash memory becomes full, you must erase all the files in the bootflash memory file system

before copying a new image file from the TFTP server.

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Using the Bootflash Memory SIMM

Note

When bootflash memory is full, it is important to make a copy of a known good image file, and then

copy a new system image file. If the new image file you copy from the TFTP server becomes

corrupted, you can revert to the copy of the known good system image file. For detailed information

on how to make a copy of a known good image file, and then copy a new system image file, see the

“Copying the System Image to the Layer 3 Switch Router” section on page 3-13.

To erase and clean bootflash memory and then copy the new system image from the TFTP server to

bootflash memory, perform the following procedure, beginning in privileged EXEC mode:

Command

Purpose

Step 1

Step 2

Router# dir bootflash:

Display the contents of bootflash memory,

including the names of the images that

currently reside there.

Router# copy tftp: bootflash:

Erase bootflash memory and copy a file from

a TFTP server to bootflash memory.

The following example demonstrates how to erase and clean bootflash memory and then copy the new

system image from the TFTP server to the bootflash memory SIMM.

Note

To erase a full bootflash memory, enter yes when you are prompted to confirm erasing bootflash

memory.

Router# copy tftp bootflash:

Address or name of remote host []? 172.10.00.00

Source filename []? domino/cat2948g-in-mz.120-7.W5.14.46

Destination filename [cat2948g-in-mz.120-7.W5.14.46]?

Accessing tftp://172.10.00.00/domino/cat2948g-in-mz.120-7.W5.14.46...

Erase bootflash: before copying? [confirm] yes

Erasing the bootflash filesystem will remove all files! Continue? [confirm] yes

Erasing device... eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee

ee ...erased

Erase of bootflash: complete

Loading domino/cat2948g-in-mz.120-7.W5.14.46 from 172.10.00.00 (via FastEthernet1):

!!.!!!!.!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!.!!!!!!!!!!!!!!!!!!!!!!!!!!

!!!!!.!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!.!!!!!!!!!!!!!!!!!!!!!!

!!!!!!!!!!!!!!!!!!!!!!!.!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!.!

!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!.!!!!!!!!!!!!!!!!!!!!!!!!!!!

!!!!!!!!!!!!!!!!!!!!!!!!!!.!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

.!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!.!!!!!!!!!!!!!!!!!!!!!!!

!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!.!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

!!!!!!!!.!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!.!!!!!!!!!!!!!!!!

!!!!!

[OK - 3173128/6345728 bytes]

Verifying checksum... OK (0x799F)

3173128 bytes copied in 177.668 secs (17927 bytes/sec)

Router# dir bootflash:

Directory of bootflash:/

1 -rw-

3173128

<no date> cat2948g-in-mz.120-7.W5.14.46

16777216 bytes total (13604024 bytes free)

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Chapter 3 Configurations for the Layer 3 Switch Router

Recovering a System Image Using Xmodem and Ymodem

If you do not have access to a network server and need to download a system image, you can copy an

image from a local or remote computer (such as a PC, UNIX workstation, or Macintosh computer) using

the Xmodem or Ymodem protocols.

Xmodem and Ymodem are common protocols used for transferring files and are included in applications

such as Windows 3.1 (TERMINAL.EXE), Windows 95 (HyperTerminal), Windows NT 3.5x

(TERMINAL.EXE), Windows NT 4.0 (HyperTerminal), and Linux UNIX freeware (minicom).

Xmodem and Ymodem downloads are slow, so you should use them only when you do not have access

to a network server. You can speed up the transfer by setting the transfer port speed to 57600 bps.

If all local system images are damaged or erased on your Layer 3 switch router, you can perform the file

transfer by using the ROM monitor. On the Catalyst 2948G-L3 and the Catalyst 4908G-L3 switch

routers, you can perform the file transfer from the ROM monitor over the console port.

Note

Perform file transfer from the ROM monitor with either Cisco IOS Release 12.0(7)W5(15a) or later.

To verify the ROM monitor version, enter either the Cisco IOS show version command or enter the

reset command from ROMMON mode.

Figure 3-1 shows a file transfer using the Xmodem or Ymodem protocols. The connection is from either

a local or a remote computer to your Layer 3 switch router. You can make the connection using either

the COM port on the local computer or using a modem with the remote computer.

Figure 3-1 Transferring a System Image to a Layer 3 Switch Router Using Xmodem and Ymodem

Protocols

Catalyst 2948G-L3 or

Catalyst 4908G-L3 switch

router downloading a

Cisco IOS software image

from a local or remote PC

Modem

Telephone

network

Modem

Console

port

Remote PC

running terminal

emulation software

and Xmodem and

Ymodem protocols

Local PC running

terminal emulation

software and Xmodem

and Ymodem protocols

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Chapter 3 Configurations for the Layer 3 Switch Router

Recovering a System Image Using Xmodem and Ymodem

To copy a Cisco IOS image from a computer or workstation to a router using the Xmodem or Ymodem

protocol, perform the following procedure:

Task

Command

Copy a system image from a computer to DRAM xmodem [-c | -y | -s ]

using the ROM monitor.

The -c option provides cyclic redundancy check

(CRC)-16 checksumming; -y uses the Ymodem

protocol; and -s sets the console port data rate or

speed. Speeds range from 1200 bps to 57600 bps.

The computer from which you transfer the Cisco IOS image must be running terminal emulation

software and the Xmodem or Ymodem protocol.

Example of Xmodem Transfer Using the ROM Monitor Mode

This section explains how to transfer a Cisco IOS image file using the ROM monitor mode and the

Xmodem protocol. You can download an image from Cisco.com.

The Catalyst 2949G-L3 and the Catalyst 4908G-L3 switch routers must have enough DRAM to hold the

IOS image file being transferred. The transferred IOS image runs only in DRAM and cannot be stored

in bootflash memory. After your Layer 3 switch router boots up with the transferred image, you can copy

a good IOS image from a TFTP server onto the bootflash file system.

Caution

Having a modem connection from the telephone network to your console port introduces security

issues that you should consider before enabling the connection. For example, remote users can dial

in to your modem and access the Layer 3 switch router’s configuration settings.

To download an IOS image from the ROM monitor mode (using the Xmodem and Ymodem protocols),

perform the following steps:

Step 1

Step 2

Place the Cisco IOS software image on the remote computer’s hard drive.

Transfer the image from either a remote or a local computer.

•

To transfer the image from a remote computer:

–

Connect a modem to the console port of your Layer 3 switch router and to the standard

telephone network. The modem and console port must communicate at the same speed, which

can be from 1200 to 57600 bps, depending on the speed supported by your modem.

Note

We recommend that you use the maximum speed of 57600 bps.The size of an IOS image is

approximately 3 MB and takes about 10 minutes to transfer at 57600 bps.

–

Enter the confreg ROM monitor command to configure the console port transmission speed for

the Layer 3 switch router. You can also set the transmission speed with the -s option.

Connect a modem to the remote computer and to the telephone network. The remote computer

dials through the telephone network and connects to the Layer 3 switch router.

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Recovering a System Image Using Xmodem and Ymodem

Note

If you are transferring from a local computer, you may need to configure the terminal

emulation program to ignore Ready to Send/data terminal ready (RTS/DTR) signals.

•

To transfer the image from a local computer:

–

Connect the Layer 3 switch router’s console port to a COM port (serial port) on the computer,

using a null-modem cable. The console port speed configured on the router must match the

transfer speed configured on the local computer.

You see a ROM monitor prompt in the terminal emulation window:

rommon >

Step 3

Enter the xmodem ROM monitor command.

The image is downloaded to DRAM and normally executes on completion of the file transfer. The -c

option specifies CRC-16 checksum, which is more thorough than a standard checksum, if supported by

your computer.

The following example shows how to use the xmodem command to transfer an IOS image in ROM

monitor:

rommon > xmodem -y -s57600

Do not start sending the image yet...

Invoke this application for disaster recovery.

Do you wish to continue? y/n [n]: yes

Note, if the console port is attached to a modem, both the

console port and the modem must be operating at the same baud

rate. Use console speed 57600 bps for download [confirm]

Download will be performed at 57600. Make sure your terminal

emulator is set to this speed before sending file.

Ready to receive file ...

Step 4

Start an Xmodem send operation.

Xmodem send operations are initiated from the terminal emulation software on the local or remote

computer that is sending the system image to the Layer 3 switch router. Refer to your emulation software

application’s manual for instructions on how to execute an Xmodem file transfer.

Note

The remote connection terminates when you reset the speed on the terminal emulator.

Step 5

Reset the speed on the terminal emulator back to 9600 bps after you complete the transfer of the IOS

image into DRAM.

You see the following output upon completion of the IOS image transfer:

Returning console speed to 9600.

Please reset your terminal emulator to this speed...

and hit 'y' to continue

Step 6

Step 7

Disconnect the modem from the console port and reconnect the terminal line. Enter yes to continue. Your

Layer 3 switch router automatically reboots with the IOS image.

Download an image from Cisco.com onto the bootflash file system after your Layer 3 switch router

reboots.

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Chapter 3 Configurations for the Layer 3 Switch Router

Updating the System Image

This section provides brief instructions for updating the system image on your Layer 3 switch router.

This procedure assumes that you are manually booting the Layer 3 switch router from a system image

on the bootflash memory SIMM. You can also configure the Layer 3 switch router to boot automatically

from a system image specified in the BOOT environment variable. For additional information on booting

options and maintaining system images, refer to the Cisco IOS Configuration Fundamentals

Configuration Guide.

To update the system software, do the following:

Step 1

Step 2

Step 3

Download the system image from Cisco.com.

Copy the system image to the Layer 3 switch router.

Reload the Layer 3 switch router with the new image.

Downloading System Images from Cisco.com

Cisco IOS system images, along with other software, are available from the Software Center on

Cisco.com at http://www.Cisco.com. You can download system images from Cisco.com using your

browser’s FTP capability, using conventional FTP, or using Cisco.com’s asynchronous dial-up interface.

For instructions on accessing and downloading software from Cisco.com, refer to the Software

Downloading from Cisco.com via World Wide Web publication at the Software Center on Cisco.com.

Copying the System Image to the Layer 3 Switch Router

You can copy the system image to the Layer 3 switch router using TFTP, FTP, or rcp. If the system you

used to download the image from Cisco.com does not function as a TFTP, FTP, or rcp server, you must

first copy the file to an intermediate server that provides those services to your Layer 3 switch router.

Note

Before copying the system image from the server to the Layer 3 switch router, check the size of the

file to make sure you will have enough room for your Layer 3 switch router’s bootflash memory.

If the bootflash memory is full, you must erase all the files in the bootflash memory file system before

copying a new image file from the TFTP server. In addition, before you copy a new image from the TFTP

server, you must first download a copy of your known good image. If the new image file you copy from

the TFTP server is corrupted, you can revert to the known good image.

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Chapter 3 Configurations for the Layer 3 Switch Router

Updating the System Image

To copy both the known good system image and the new system image from a TFTP server to the file

system on your Layer 3 switch router, initiate a Telnet session or console connection to the Layer 3

switch router, perform the following task in privileged EXEC mode:

Command

Purpose

Step 1

Step 2

Step 3

Router# dir bootflash:

Display the contents and available space in bootflash memory. If

there is not enough free space to copy the new system image, do

Steps 2 through 5. If there is enough space, proceed to Step 4.

Router# copy tftp: bootflash:

Router# dir bootflash:

Erase bootflash memory and copy a file from a TFTP server to

bootflash memory. Make sure you copy the known good system

image file.

Display the contents of bootflash memory. This step confirms that

space was available in bootflash memory and the known good

image file was copied as expected. You can then proceed to

download the latest image.

Step 4

Step 5

Router# copy tftp: bootflash:

Router# dir bootflash:

Initiate a TFTP session to copy the new system image from the

TFTP server.

Display the contents of bootflash memory again, to confirm that

the latest image file was copied as expected.

The following example shows how to erase a full bootflash memory file system, copy a known good

image, and copy the latest image using TFTP:

Router# copy tftp bootflash:

Address or name of remote host []? 172.10.00.00

Source filename []? domino/cat2948g-in-mz.120-7.W5.14.45

Destination filename [cat2948g-in-mz.120-7.W5.14.45]?

%Warning:There is a file already existing with this name

Do you want to over write? [confirm] yes

Accessing tftp://172.10.00.00/domino/cat2948g-in-mz.120-7.W5.14.45...

Erase bootflash: before copying? [confirm] yes

Erasing the bootflash filesystem will remove all files! Continue? [confirm] yes

Erasing device... eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee

ee ...erased

Erase of bootflash: complete

Loading domino/cat2948g-in-mz.120-7.W5.14.45 from 172.10.00.00 (via FastEthernet 1):

!!!!!!.!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!.!!!!!!!!!!!!!!!!!!!!!!!!!!

!!!!!.!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!.!!!!!!!!!!!!!!!!!!!!!!

!!!!!!!!!!!!!!!!!!!!!!!.!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!.!

!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!.!!!!!!!!!!!!!!!!!!!!!!!!!!!

!!!!!!!!!!!!!!!!!!!!!!!!!!.!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

.!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!.!!!!!!!!!!!!!!!!!!!!!!!

!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!.!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

!!!!!!!!.!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!.!!!!!!!!!!!!!!!!

!!!!!

[OK - 3173128/6345728 bytes]

Verifying checksum... OK (0x799F)

3173128 bytes copied in 177.668 secs (17927 bytes/sec)

Router# dir bootflash:

Directory of bootflash:/

1 -rw-

3173128

<no date> cat2948g-in-mz.120-7.W5.14.45

16777216 bytes total (13604024 bytes free)

Router# copy tftp: bootflash:

Address or name of remote host [172.10.00.00]?

Catalyst 2948G-L3 and Catalyst 4908G-L3 Switch Router Software Feature and Configuration Guide

78-10408-03

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