Introduction to Cisco router password recovery steps

Network is inseparable from the password, as a network administrator to remember more than one router password, if the router password forgotten, we need to set up a router to restore the password.

Router password recovery has a common, that is, let the router start to skip the configuration file, direct startup, and finally change the password, and finally achieve the purpose of recovery password.

　　First, 2500 series Cisco router password recovery

(1) Connect the control port of the router to the serial port of the computer, start the computer Super Terminal, set its parameter to baud rate 9600, data bit 8, parity check is none, stop bit is 1, flow control chooses none. Turn on the router power, press Ctrl+break key in one minute on the boot, make the router Enter monitor mode (rommonitor state), prompt will display as >.

(2) Execute the e/s2000002 command to view the value of the Configure–register and write down the value.

(3) The implementation of the o/r0x0142 command to update the Configure–register value, so that the router started skipping the configuration file, that is, start directly, so that the password does not work.

(3) Reboot the router.

(4) After the router starts to enter the privileged mode, executes the CONFIGMEM command, maintains the previous configuration information to be valid.

(5) At this time can be normal operation to view the original password, of course, the need to do here is to change the password for their familiar, difficult to forget.

(6) Restore the Configure-register value, and then restart the router, and then the device can return to normal working state.

You can end the Cisco router password recovery by executing configure-register0x (the Configure–register value noted between the two), write, and reload these three commands.

　　Second, 2600 series Cisco router password recovery

(1) Connecting the control port (console port) of the router to the computer, click start → all programs → attachments → HyperTerminal start HyperTerminal program, set parameters for baud rate 9600, data bit 8, parity for none, stop bit is 1, flow control Select None, turn on the router power, Press the Ctrl+break combination on the computer at the same time on the power-on for the router to enter monitor mode (Rommonitor State), at which point the prompt will appear as rommon1>.

(2) Execute the confreg command to ignore the configuration file, start directly, and then reconfigure the registers. When the ScreenTip doyouwishtochangetheconfiguration (y/n), enter Y, and the next option is input n. When the ScreenTip prompts for the "Ignoresystemconfigurationinformation" (y/n) message, enter Y, and the next option is input n.

(3) Enter the Reset command in the prompt state, return to execute, restart the router.

(4) After restarting the router and entering privileged mode, the CONFIGMEM command maintains the configuration information before it is valid, and then the password for the routed device can be viewed.

The above detailed description of the password recovery specific steps, listed now using a very wide range of 2600 and 2500 series Cisco router password recovery, 2600 of the method for 2600 systems above the router is also most applicable, The 2500 approach is most applicable for routers below 2500.