Cisco - Switch Notes

Monday, 29 August 2011 08:30 Webadmin
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Show Flash - Useful when configuring switch setup:

 

A sh flash shows

 

2  -rwx        6051  Jan 11 2010 18:15:10 +00:00  config.text
4  -rwx         676   Jan 8 1994 02:35:40 +00:00  vlan.dat
5  drwx         192   Mar 1 1993 00:12:17 +00:00  c3750-ipservices-mz.122-25.SEE3
458  -rwx         512  May 23 2010 18:24:03 +00:00  config.text.new

 

Notice the config.text.net. You may also see private-config.text.backup and/or config.text.backup. These may be there due to the switch being previously managed.

Along with the config.text you may need to write the text file.

There are a number of ways to write:

 

The three most common commands used for image copying are:

copy tftp flash
copy rcp flash

copy slot0: slot1:

Also you may need to delete the existing Vlan information. Running a wr er (write erase) command does not delete the vlan information. The delete flash:vlan.dat will default any vlan information to the default setup. Or sh vlan will allow you to check the current vlan setup which may or may not be at the default. Once you determine that a vlan setup has been completed on the switch you will have to delete the vlan.dat to put everything back to default.

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
Write the config.text file
  1. Type rename flash:config.text flash:config.old to rename the configuration file.

    switch: rename flash:config.text flash:config.old
    switch:
    
    !--- The config.text file contains the password 
    !--- definition.
    
    
  2. Issue the boot command to boot the system.

    switch: boot
    Loading "flash:c3500xl-c3h2s-mz.120-5.WC7.bin"...###############################
    ################################################################################
    ######################################################################
    File "flash:c3500xl-c3h2s-mz.120-5.WC7.bin" uncompressed and installed, entry po
    int: 0x3000
    executing...
    
    !--- Output suppressed.
    !--- This output is from a 3500XL switch. Output from other switches 
    !--- will vary slightly.
    
    
  3. Enter "n" at the prompt to abort the initial configuration dialog.

    --- 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 '[]'.
    Continue with configuration dialog? [yes/no]: n 
    
    !--- Type "n" for no.
    
    Press RETURN to get started.
    
    !--- Press Return or Enter.
    
    Switch>
    
    !--- The Switch> prompt is displayed.
    
    
  4. At the switch prompt, type en to enter enable mode.

    Switch>en
    Switch#
  5. Type rename flash:config.old flash:config.text to rename the configuration file with its original name.

    Switch#rename flash:config.old flash:config.text
    Destination filename [config.text] 
    
    !--- Press Return or Enter.
    
    Switch#
  6. Copy the configuration file into memory.

    Switch#copy flash:config.text system:running-config
    Destination filename [running-config]? 
    
    !--- Press Return or Enter.
    
    1131 bytes copied in 0.760 secs
    Sw1#

    The configuration file is now reloaded.

     

     



     

This document describes the password recovery procedure for the Cisco Catalyst Layer 2 fixed configuration switches 2900XL/3500XL, 2940, 2950/2955, 2960, and 2970 Series, as well as the Cisco Catalyst Layer 3 fixed configuration switches 3550, 3560, and 3750 Series.

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

There are no specific prerequisites for this document.

Follow the password recovery procedure below.

  1. Attach a terminal or PC with terminal emulation (for example, Hyper Terminal) to the console port of the switch.

    Use the following terminal settings:

    • Bits per second (baud): 9600

    • Data bits: 8

    • Parity: None

    • Stop bits: 1

    • Flow Control: Xon/Xoff

    Note: For additional information on cabling and connecting a terminal to the console port, refer to Connecting a Terminal to the Console Port on Catalyst Switches.

  2. Unplug the power cable.

  3. Power the switch and bring it to the switch: prompt:

    For 2900XL, 3500XL, 2940, 2950, 2960, 2970, 3550, 3560, and 3750 series switches, do this:

    Hold down the mode button located on the left side of the front panel, while you reconnect the power cable to the switch.

    Catalyst Switch SeriesLED Behavior and Mode Button Release Action
    2900XL, 3500XL, 3550 Release the Mode button when the LED above Port1x goes out.
    2940, 2950 Release the Mode button after approximately 5 seconds when the Status (STAT) LED goes out. When you release the Mode button, the SYST LED blinks amber.
    2960, 2970 Release the Mode button when the SYST LED blinks amber and then turns solid green. When you release the Mode button, the SYST LED blinks green.
    3560, 3750 Release the Mode button after approximately 15 seconds when the SYST LED turns solid green. When you release the Mode button, the SYST LED blinks green.

     

    Note: LED position may vary slightly depending on the model.

    Catalyst 3524XL

    pswdrec_2900xl_1.gif

    Catalyst 2950-24

    pswdrec_2900xl_2.gif

    For 2955 series switches only:

    The Catalyst 2955 series switches do not use an external mode button for password recovery. Instead the switch boot loader uses the break-key detection to stop the automatic boot sequence for the password recovery purposes. The break sequence is determined by the terminal application and operating system used. Hyperterm running on Windows 2000 uses Ctrl + Break. On a workstation running UNIX, Ctrl-C is the break key. For more information, refer toStandard Break Key Sequence Combinations During Password Recovery.

    The example below uses Hyperterm to break into switch: mode on a 2955.

    C2955 Boot Loader (C2955-HBOOT-M) Version 12.1(0.0.514), CISCO DEVELOPMENT TEST
    VERSION
    Compiled Fri 13-Dec-02 17:38 by madison
    WS-C2955T-12 starting...
    Base ethernet MAC Address: 00:0b:be:b6:ee:00
    Xmodem file system is available.
    Initializing Flash...
    flashfs[0]: 19 files, 2 directories
    flashfs[0]: 0 orphaned files, 0 orphaned directories
    flashfs[0]: Total bytes: 7741440
    flashfs[0]: Bytes used: 4510720
    flashfs[0]: Bytes available: 3230720
    flashfs[0]: flashfs fsck took 7 seconds.
    ...done initializing flash.
    Boot Sector Filesystem (bs:) installed, fsid: 3
    Parameter Block Filesystem (pb:) installed, fsid: 4
    
    *** The system will autoboot in 15 seconds ***
    Send break character to prevent autobooting.
    
    
    !--- Wait until you see this message before 
    !--- you issue the break sequence.
    !--- Ctrl+Break is entered using Hyperterm.
    
    
    The system has been interrupted prior to initializing the flash file system to finish 
    loading the operating system software:
    
    flash_init
    load_helper
    boot
    switch:
  4. Issue the flash_init command.

    switch: flash_init
    Initializing Flash...
    flashfs[0]: 143 files, 4 directories
    flashfs[0]: 0 orphaned files, 0 orphaned directories
    flashfs[0]: Total bytes: 3612672
    flashfs[0]: Bytes used: 2729472
    flashfs[0]: Bytes available: 883200
    flashfs[0]: flashfs fsck took 86 seconds
    ....done Initializing Flash.
    Boot Sector Filesystem (bs:) installed, fsid: 3
    Parameter Block Filesystem (pb:) installed, fsid: 4
    switch:
    
    !--- This output is from a 2900XL switch. Output from 
    !--- other switches will vary slightly.
    
    
  5. Issue the load_helper command.

    switch: load_helper
    switch:
  6. Issue the dir flash: command.

    Note: Make sure to type a colon ":" after the dir flash.

    The switch file system is displayed:

    switch: dir flash:
    Directory of flash:/
    2    -rwx  1803357   <date>               c3500xl-c3h2s-mz.120-5.WC7.bin
    
    !--- This is the current version of software.
    
    4    -rwx  1131      <date>               config.text
    
    !--- This is the configuration file.
    
    5    -rwx  109       <date>               info
    6    -rwx  389       <date>               env_vars
    7    drwx  640       <date>               html
    18   -rwx  109       <date>               info.ver
    403968 bytes available (3208704 bytes used)
    switch:
    
    !--- This output is from a 3500XL switch. Output from 
    !--- other switches will vary slightly.
    
    
  7. Type rename flash:config.text flash:config.old to rename the configuration file.

    switch: rename flash:config.text flash:config.old
    switch:
    
    !--- The config.text file contains the password 
    !--- definition.
    
    
  8. Issue the boot command to boot the system.

    switch: boot
    Loading "flash:c3500xl-c3h2s-mz.120-5.WC7.bin"...###############################
    ################################################################################
    ######################################################################
    File "flash:c3500xl-c3h2s-mz.120-5.WC7.bin" uncompressed and installed, entry po
    int: 0x3000
    executing...
    
    !--- Output suppressed.
    !--- This output is from a 3500XL switch. Output from other switches 
    !--- will vary slightly.
    
    
  9. Enter "n" at the prompt to abort the initial configuration dialog.

    --- 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 '[]'.
    Continue with configuration dialog? [yes/no]: n 
    
    !--- Type "n" for no.
    
    Press RETURN to get started.
    
    !--- Press Return or Enter.
    
    Switch>
    
    !--- The Switch> prompt is displayed.
    
    
  10. At the switch prompt, type en to enter enable mode.

    Switch>en
    Switch#
  11. Type rename flash:config.old flash:config.text to rename the configuration file with its original name.

    Switch#rename flash:config.old flash:config.text
    Destination filename [config.text] 
    
    !--- Press Return or Enter.
    
    Switch#
  12. Copy the configuration file into memory.

    Switch#copy flash:config.text system:running-config
    Destination filename [running-config]? 
    
    !--- Press Return or Enter.
    
    1131 bytes copied in 0.760 secs
    Sw1#

    The configuration file is now reloaded.

  13. Overwrite the current passwords that you do not know. Choose a strong password with at least one capital letter, one number, and one special character.

    Note: Overwrite the passwords which are necessary. You need not overwrite all of the mentioned passwords.

    Sw1# conf t
    
    
    !--- To overwrite existing secret password
    
    Sw1(config)#enable secret <new_secret_password>
    
    
    
    !--- To overwrite existing enable password
    
    Sw1(config)#enable password <new_enable_password>
    
    
    
    !--- To overwrite existing vty password
    
    Sw1(config)#line vty 0 15
    Sw1(config-line)#password <new_vty_password>
    
    Sw1(config-line)#login
    
    
    !--- To overwrite existing console password
    
    Sw1(config-line)#line con 0
    Sw1(config-line)#password <new_console_password>
    
    
  14. Write the running configuration to the configuration file with the write memory command.

    Sw1#write memory
    Building configuration...
    [OK]
    Sw1#


 


Last Updated on Monday, 29 August 2011 15:30