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Cisco Catalyst 2900 XL Series Switches

Resetting Catalyst Switches to Factory Defaults

Document ID: 24328

Updated: Dec 21, 2005

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Introduction

In certain situations, it is desirable to restore the Catalyst switch configuration to the original default factory settings. This is useful when you want to remove an undesirable configuration that is present in the switch. If you have configured a switch and the configuration has become very complex or if you want to move a switch from one network to other, you can reset the switch to factory defaults and configure it as a new switch. This document provides information and sample command logs to reset your switches.

To reset the Catalyst switches to factory defaults, you need access to the switch console through either a physical console or a Telnet connection. You also need the console/enable passwords. If you forget the console and enable password of your switch, you cannot reset the switch configuration to factory default to reset the password. In this case, you need to follow the password recovery procedures for your switch. Refer to this document for steps to recover the passwords on your Catalyst switches:

Note: If you reset the switch to factory defaults while you access the switch by Telnet connection, you lose connectivity to the switch.

Prerequisites

Requirements

There are no specific requirements for this document.

Components Used

The information in this document was tested with these software and hardware versions:

Note: Although the document was created with these Catalyst switches, the principles apply to the products mentioned in the document.

  • Catalyst 5505 switch with Catalyst OS (CatOS) version 6.4(8)

  • Catalyst 2950 switch with Cisco IOS® Software Release 12.1(19)EA1

  • Catalyst 6500/6000 switch with Cisco IOS Software Release 12.1(20)E

The information in this document was created from the devices in a specific lab environment. All of the devices used in this document started with a cleared (default) configuration. If your network is live, make sure that you understand the potential impact of any command.

Conventions

For more information on document conventions, refer to the Cisco Technical Tips Conventions.

Before You Begin

Before you reset the switch to factory defaults, perform one of these tasks:

  • Back up your configuration on a TFTP server.

  • Copy your configuration to a text file.

  • Copy the configuration locally on the bootflash or slot0: device.

Once you clear the user configuration, there is no way to recover the configuration unless you restore the backed-up configuration. To upload a configuration file on a TFTP server, refer to this document:

Note: You can restore the complete configuration if you copy the text file configuration and paste it to the command line.

Reset Catalyst Switches Running CatOS

This procedure applies to Catalyst 4500/4000, 5500/5000, and 6500/6000 series switches running CatOS. These switches store the configuration in NVRAM automatically, wherever users enter the commands in enable mode. On Cisco IOS Software, you must save the configuration with the write memory command or the copy running-config startup-config command. You can reset the system or module configuration on these switches running CatOS to factory defaults with the clear config command. The command syntax is:

clear config {mod | rmon | all | snmp | acl {nvram}}

The clear config all command clears the system configuration, as well as the module configuration. This command does not, however, clear the boot variables, such as config-register and boot system settings. You can alter the boot variable settings with the set boot command. If your switch has any router cards, the clear config all command does not clear the Cisco IOS Software configuration on the router cards. (Examples of these router cards include WS-X4232-L3 modules on the 4000 switches, Route Switch Modules [RSMs]/Route Switch Feature Cards [RSFCs] on the 5500/5000 switches, or the Multilayer Switch Modules [MSMs]/Multilayer Switch Feature Cards [MSFCs] on the 6500/6000 switches.) To clear the configuration on router cards, you can access the router card with the session command. Then, reset the switch to factory defaults with use of the procedure in the Reset Catalyst Switches Running Cisco IOS Software section of this document. This example shows how to reset the configuration on the switch to factory defaults:

Cat5k> (enable) clear config all
This command will clear all configuration in NVRAM.
This command will cause ifIndex to be reassigned on the next system startup.
Do you want to continue (y/n) [n]? y
...........
..........
................................
2002 Aug 03 15:16:19 %MLS-5-MCAST_STATUS:IP Multicast Multilayer Switching is disabled

System configuration cleared.
Use 'session' command to clear ATM or Router specific configurations.
Console> (enable) 
Console> (enable)

After the configuration erase in CatOS, you do not need to reload the switch. The configuration takes effect immediately, and the switch returns to the factory default configuration. If you want to clear the configuration of a specific module on the switch, issue the clear config mod command, as shown here:

Cat5k> (enable) clear config 5
This command will clear module 5 configuration.
Do you want to continue (y/n) [n]? y
................................
Module 5 configuration cleared.
Cat5k> (enable) 
Cat5k> (enable)

Reset Catalyst Switches Running Cisco IOS Software

The procedure in this section applies to the router cards, the modular or fixed configuration switches, and GL-3 Catalyst series switches running Cisco IOS Software:

  • Router cards

    • WS-X4232-L3 (Catalyst 4006/4000)

    • RSM/RSFC (Catalyst 5500/5000)

    • MSFC/MSM (Catalyst 6500/6000)

  • Catalyst modular switches

    • Catalyst 6500/6000

    • Catalyst 4500/4000

  • Catalyst fixed configuration switches

    • Catalyst 2940

    • Catalyst 2950/2955

    • Catalyst 2970

    • Catalyst 3550

    • Catalyst 3560

    • Catalyst 3750

    • Catalyst 2900XL/3500XL

  • GL-3 Catalyst switches

    • Catalyst 2948G-L3

    • Catalyst 4908G-L3

Switches running Cisco IOS Software have a running configuration file and a startup configuration file. The RAM stores the running configuration, and the NVRAM stores the startup configuration. When you make a configuration change to a switch running Cisco IOS Software, the change becomes part of the running configuration. You must save the configuration changes to the startup configuration; otherwise, the configuration is lost during the next reload or power outage. This is because you lose the running configuration stored in RAM when you reload the switch or turn off the power. To save the configuration into NVRAM, issue the write memory command or the copy running-config startup-config command. If you do not save your changes to NVRAM, the changes clear from RAM and are no longer part of the startup configuration when the switch reloads.

On the Catalyst modular or fixed configuration switches running Cisco IOS Software, a separate file stores the VLAN information. The file is called vlan.dat file and is stored in NVRAM for modular switches or in Flash for fixed configuration switches. To reset these switches to factory defaults, you need to delete the startup configuration and the vlan.dat file. To restore the Catalyst 2948G-L3/4908G-L3 switches and router cards to the factory defaults, you only need to delete the startup configuration file. These switches do not contain VLAN information because they do not participate in VLAN Trunk Protocol (VTP).

Reset Switch Configuration

To reset the switch to factory default, issue the erase startup-config or write erase command. This command does not clear the boot variables, such as config-register and boot system settings. You can alter the boot system parameters with the boot command. In Catalyst 4500/4000 and 6500/6000 series switches running Cisco IOS Software, you can change the configuration register value with the config-register command.

This example shows how to reset a switch running Cisco IOS Software to factory defaults with the write erase command:

Cat2950# write erase
Erasing the nvram filesystem will remove all files! Continue? [confirm]y[OK]
Erase of nvram: complete
Cat2950#
Cat2950# reload

System configuration has been modified. Save? [yes/no]: n    

!--- Do not save the configuration at this prompt. Otherwise, the switch
!--- reloads with the current running configuration and does not reset to default.

Proceed with reload? [confirm]y                              

2w0d: %SYS-5-RELOAD: Reload requested

C2950 Boot Loader (C2950-HBOOT-M) Version 12.1(11r)EA1, RELEASE SOFTWARE (fc1)
Compiled Mon 22-Jul-02 18:57 by antonino
WS-C2950G-12-EI starting...


!--- Output suppressed. 


32K bytes of flash-simulated non-volatile configuration memory.
Base ethernet MAC Address: 00:05:DC:C9:79:00
Motherboard assembly number: 73-5781-08
Motherboard serial number: FAB0515A069
Model revision number: 02
Model number: WS-C2950-24
System serial number: FAB0517Q00B

--- System Configuration Dialog ---

Would you like to enter the initial configuration dialog? [yes/no]:n 
00:00:16: %SPANTREE-5-EXTENDED_SYSID: Extended SysId enabled for type vlan
00:00:21: %SYS-5-RESTART: System restarted --
Cisco Internetwork Operating System Software 
IOS (tm) C2950 Software(C2950-I6Q4L2-M)Version 12.1(19)EA1, RELEASE SOFTWARE (fc1)
Copyright (c) 1986-2003 by cisco Systems, Inc.
Compiled Tue 09-Dec-03 00:12 by yenanh

Press RETURN to get started!

00:00:37: %LINK-5-CHANGED: Interface Vlan1, changed state to administratively down
00:00:38: %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan1, changed state to down
Switch>
Switch>

At this stage, the switch configuration has reset to the factory defaults, with the exclusion of the VLAN information.

Reset VLAN Information

To reset the VLAN information to the factory defaults, delete the vlan.dat file from the Flash or NVRAM and reload the switch. On the 6500/6000 series switches running Cisco IOS Software, the vlan.dat file is stored in const_nvram. On the 4500/4000 series switches running Cisco IOS Software, the vlan.dat file is stored in cat4000_flash:. On the 2940, 2950/2955, 2970, 3550, 3550, 3560, 3570, and 2900XL/3500XL fixed configuration switches, the vlan.dat file is stored in flash:.

To erase the vlan.dat file on the 6500/6000 switches, issue the erase const_nvram: command. On the 4500/4000 switches, issue the erase cat4000_flash: command. On the fixed configuration switches, issue the delete flash:vlan.dat command.

The example steps show how to delete the VLAN information on Catalyst fixed configuration switches. You can use the same steps, with their respective commands, for the 6500/6000 and 4500/4000 running Cisco IOS Software:

  1. To verify the VLAN information, issue the show vlan command, and to verify the vlan.dat file, issue the dir command.

    Cat2950# show vlan
    
    VLAN Name                             Status    Ports
    ---- -------------------------------- --------- -------------------------------
    1    default                          active    Fa0/1, Fa0/2, Fa0/3, Fa0/4
                                                    Fa0/5, Fa0/6, Fa0/7, Fa0/8
                                                    Fa0/9, Fa0/10, Fa0/11, Fa0/12
                                                    Fa0/13, Fa0/14, Fa0/15, Fa0/16
                                                    Fa0/17, Fa0/18, Fa0/19, Fa0/20
                                                    Fa0/21, Fa0/22, Fa0/23, Fa0/24
    
    2    VLAN0002                         active    
    3    VLAN0003                         active    
    4    VLAN0004                         active
            
    
    !--- Despite the erase of the startup configuration file, 
    !--- these user-created VLANs remain.
    
    
    600  VLAN0600                         active    
    1002 fddi-default                     active    
    1003 token-ring-default               active    
    1004 fddinet-default                  active    
    1005 trnet-default                    active    
    
    VLAN Type  SAID       MTU   Parent RingNo BridgeNo Stp  BrdgMode Trans1 Trans2
    ---- ----- ---------- ----- ------ ------ -------- ---- -------- ------ ------
    1    enet  100001     1500  -      -      -        -    -        1002   1003
    2    enet  100002     1500  -      -      -        -    -        0      0   
    3    enet  100003     1500  -      -      -        -    -        0      0   
    4    enet  100004     1500  -      -      -        -    -        0      0   
    600  enet  100600     1500  -      -      -        -    -        0      0   
    1002 fddi  101002     1500  -      -      -        -    -        1      1003
    1003 tr    101003     1500  1005   -      -        -    srb      1      1002
    1004 fdnet 101004     1500  -      -      1        ibm  -        0      0   
    1005 trnet 101005     1500  -      -      1        IBM  -        0      0   
    Switch#  
    
    
    Cat2950# dir flash:
    
    !--- On the 4500/4000, issue the dir cat4000_flash: command.
    !--- On the 6500/6000, issue the dir const_nvram: command.
    
    Directory of flash:/
    
    2  -rwx     2487439   Mar 11 1993 01:25:32  c2950-i6q4l2-mz.121-9.EA1d.bin
    3  -rwx         840   Mar 20 1993 09:20:09  vlan.dat  
    
    !--- This vlan.dat file stores user-configured VLANs.
    
    4  -rwx     2491435   Mar 08 1993 16:14:13  c2950-mvr.bin
    6  -rwx          42   Mar 01 1993 00:07:35  env_vars
    7  -rwx         109   Mar 11 1993 01:23:56  info
    8  drwx         640   Mar 11 1993 01:26:35  html
    19  -rwx         109   Mar 11 1993 01:26:35  info.ver
    
    7741440 bytes total (1088512 bytes free)
    Switch#
  2. Delete the VLAN information from Flash or NVRAM, and reload the switch.

    Note: On the 6500/6000 and 4500/4000 running early versions of Cisco IOS Software, the delete command may not work. Instead, you must issue the command erase const_nvram: or the command erase cat4000_flash:. Do not specify the vlan.dat file in the command syntax. However, on later versions of Cisco IOS Software, the delete const_nvram:vlan.dat command works for the 6500/6000, and the delete cat4000_flash:vlan.dat command works on the 4500/4000.

    Cat2950# delete flash:vlan.dat
    Delete filename [vlan.dat]? 
    
    !--- Press Enter.
    
    Delete flash:vlan.dat? [confirm]y
    
    Cat2950# reload
    Proceed with reload? [confirm]y
    4w5d: %SYS-5-RELOAD: Reload requested
  3. After reload, check the VLAN information with the show vlan command.

    The user-configured VLANs no longer appear in the command output. Only factory-default VLAN information is on the switch.

    Cat2950# show vlan
    
    VLAN Name                             Status    Ports
    ---- -------------------------------- --------- -------------------------------
    1    default                          active    Fa0/1, Fa0/2, Fa0/3, Fa0/4
                                                    Fa0/5, Fa0/6, Fa0/7, Fa0/8
                                                    Fa0/9, Fa0/10, Fa0/11, Fa0/12
                                                    Fa0/13, Fa0/14, Fa0/15, Fa0/16
                                                    Fa0/17, Fa0/18, Fa0/19, Fa0/20
                                                    Fa0/21, Fa0/22, Fa0/23, Fa0/24
    1002 fddi-default                     active    
    1003 token-ring-default               active    
    1004 fddinet-default                  active    
    1005 trnet-default                    active    
    
    VLAN Type  SAID       MTU   Parent RingNo BridgeNo Stp  BrdgMode Trans1 Trans2
    ---- ----- ---------- ----- ------ ------ -------- ---- -------- ------ ------
    1    enet  100001     1500  -      -      -        -    -        0      0   
    1002 fddi  101002     1500  -      -      -        -    -        0      0   
    1003 tr    101003     1500  -      -      -        -    -        0      0   
    1004 fdnet 101004     1500  -      -      -        ieee -        0      0   
    1005 trnet 101005     1500  -      -      -        IBM  -        0      0
    Switch#

Reset Catalyst Switches in Redundant Mode

For the 6500/6000 and 5500/5000 switches running CatOS in redundant mode, the standby Supervisor Engine synchronizes with changes made to the active Supervisor Engine. So, if you reset the configuration on the active Supervisor Engine to factory defaults with the clear config command, the standby Supervisor Engine also resets to factory defaults. Whether you set the configuration mode to binary or text mode with the set config mode command, the switch resets to factory defaults when you clear the configuration on the active Supervisor Engine.

To reset 6500/6000 switches running Cisco IOS Software in redundant mode to factory defaults, you need to complete these steps:

  1. Erase the startup configuration with the erase startup-config command on the active Supervisor Engine.

    Note: This also erases the startup configuration on the standby Supervisor Engine.

  2. Delete the vlan.dat file as shown in the Reset VLAN Information section of this document.

  3. Reload the active Supervisor Engine with the reload command

Note: If the Supervisor Engine enters the ROMmon mode after it reloads, check the boot variable to see if it is set to boot from the proper image. You may also refer to the document Recovering a Catalyst 6500/6000 Running Cisco IOS System Software from a Corrupted or Missing Boot Loader Image or ROMmon Mode for further troubleshooting information.

Related Information

Updated: Dec 21, 2005
Document ID: 24328