Cisco Systems Network Router 2948G L3 User Manual

C H A P T E R  
3
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:  
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  
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  
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  
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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Chapter 3 Configurations for the Layer 3 Switch Router  
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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Chapter 3 Configurations for the Layer 3 Switch Router  
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  
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  
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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Chapter 3 Configurations for the Layer 3 Switch Router  
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  
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]?  
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Chapter 3 Configurations for the Layer 3 Switch Router  
Updating the System Image  
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 FastEthernet1):  
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!.!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!  
!!!!!!!!!!.!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!.!!!!!!!!!!!!!  
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!.!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!  
!!!!!!!!!!!.!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!.!!!!!!!!!!!!!!!  
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!.!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!  
!!!!!!!!.!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!.!!!!!!!!!!!!!!!!!  
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!.!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!  
!!!!!!!!!!!!.!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!.!!!!!!!!!!!!!!!!  
!
[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)  
Note  
Make sure that the file size of the image file you copied to bootflash memory matches the image file  
size on the server.  
Reloading the Layer 3 Switch Router  
When the configuration register is set for manual booting, entering the reload command causes the  
system to enter ROM monitor mode, where you enter the boot command and the name of the system  
image to use. To perform this procedure, you must be connected to the console port, which provides  
access to the Layer 3 switch router when in ROM monitor mode. For automatic booting, you can enter  
the reload command from an Ethernet connection to the route processor.  
Note  
This procedure assumes that you need to change the boot field in the configuration register from its  
default value so that the system reverts to ROM monitor mode when you enter the reload command.  
To reload the Layer 3 switch router with the new system image in bootflash memory, perform the  
following procedure, beginning in global configuration mode:  
Command  
Purpose  
Step 1  
Step 2  
Router(config)# config-register 0x0 Set the configuration register for manual booting from ROM  
monitor mode. 1  
Router(config)# end  
Return to privileged EXEC mode.  
Router#  
Step 3  
Router# copy system:running-config Save your configuration changes to NVRAM.  
nvram:startup-config  
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Chapter 3 Configurations for the Layer 3 Switch Router  
Updating the System Image  
Command  
Purpose  
Step 4  
Step 5  
Router# reload  
Initiate a reload of the system software. You automatically  
enter ROM monitor mode.  
rommon 1>  
rommon 1> dir bootflash:  
Display the contents of the file system. Perform this optional  
step to display and copy the name of the system image to the  
clipboard for use in Step 6.  
Step 6  
Step 7  
rommon 2> boot bootflash:filename Reboot the Layer 3 switch router with the new system image.  
You can paste the filename from the clipboard if you copied  
it in Step 5.  
Router> show version  
Display the system software version information. Use this  
step to confirm that the system is loaded with the expected  
software version.  
1. For details on using the configuration register to set boot parameters, refer to the Cisco IOS Configuration Fundamentals  
Configuration Guide.  
The following example shows how to enter terminal configuration mode, set the configuration register,  
save the configuration, and reload the Layer 3 switch router with the new image on the bootflash memory  
SIMM:  
Router# configure terminal  
Router(config)# config-register 0x0  
Router(config)# end  
Router#  
4d00h: %SYS-5-CONFIG_I: Configured from console by console  
Router#copy system:running-config nvram:startup-config  
Destination filename [startup-config]?  
Building configuration...  
[OK]  
Router# reload  
Proceed with reload? [confirm]  
rommon 1 > dir bootflash:  
File size  
3173128 bytes (0x306b08)  
3173364 bytes (0x306bf4)  
Checksum  
0x799f  
0x755f  
File name  
cat2948g-in-mz.120-7.W5.14.45  
cat2948g-in-mz.120-7.W5.14.46  
rommon 2 > boot bootflash:cat2948g-in-mz.120-7.W5.14.46  
Self decompressing the image : #################################################  
################################################################################  
################################################################################  
################################################################## [OK]  
<The system boots>  
Router> show version  
Cisco Internetwork Operating System Software  
IOS (tm) L3 Switch/Router Software (CAT2948G-IN-M), Version 12.0(7)W5(14.46) IN  
TERIM TEST SOFTWARE  
Copyright (c) 1986-2001 by cisco Systems, Inc.  
Compiled Tue 22-Feb-00 04:31 by  
Image text-base: 0x60010928, data-base: 0x605B2000  
Now that you have completed the initial configurations on your Layer 3 switch router, you can begin  
configuring the interfaces. For more information on reloading a Layer 3 switch router see Chapter 4,  
“Configuring Interfaces.”  
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