- 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
- Unplug the power cable.
- 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. - 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: - 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. - Issue the load_helper command.
switch: load_helper switch:
- 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.
- 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. - 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. - 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.
- At the switch prompt, type en to enter enable mode.
Switch>en Switch#
- 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# - Copy the configuration file into memory.
The configuration file is now reloaded.Switch#copy flash:config.text system:running-config Destination filename [running-config]? !--- Press Return or Enter. 1131 bytes copied in 0.760 secs Sw1# - 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>
- Write the running configuration to the configuration file with the write memory command.
Sw1#write memory Building configuration... [OK] Sw1#
Friday, December 9, 2016
Cisco Catalyst L2/ L3 Switch password recovery
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