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boot process and enter Rommon mode!
The input command changes the configuration register value to 0x2142, which causes the router to not read the configuration file in NVRAM when it is turned on. Then restart the router!The command is as follows:Rommon 1 > Confreg 0x2142//Change the configuration register value to 0x2142Rommon 3 > Re
is preset in the new ISR routerConfiguration file. )(4) If a boot profile is found in NVRAM, the router copies the file into RAM and calls it a runningReset The router will use this file to run the router. The router will go into a normal state of operation. If not found in NVRAMStarting the configuration file, the
following command: Global mode: from privileged mode, we can enter global mode. In this mode, you can change the entire configuration of the vro. If you need to change the configuration, you need the following command. This is an example of how to enter the global mode.
By default, if you do not set a password for the Cisco
Cisco routers use a lot of users, at the same time there will be many problems, the password is forgotten or lost users are very common problems, so I studied the Cisco router password recovery of two methods, here to take out and share with you, hope for everyone useful. Wh
: If the password is not encrypted, directly with more Nvram:startup-config command can see the password, in the case of password encryption, can not see, only modify, enter the command as follows: Router # Configure memory Router # Configure terminal
is 1, it is disable Break. If it is 0, Break is enabled.
3. Shut down the power supply and restart.
4. Press the Break key on the terminal within 60 seconds after the vro starts. The rommon> prompt is displayed. If this is not the case, the terminal does not send a correct interrupt signal to check whether the Break Key is correct or whether it is set to disable.
5. enter o/r0x42 or o/r0x41 at the prompt. o/r0x42 means to boot from Flash memory, and o/r0x41 means to boot from ROMs (note that th
password is not encrypted, you can directly use the more nvram: startup-config command to view the password. If the password is encrypted, you can only modify the password. Enter the following command:
Router # configure memory
Router
users cannot view any important information.
Privileged Mode
The administrator can view and change the configuration in this mode. I believe that it is absolutely important to have a set of passwords at this level. To switch from user mode to privileged mode, the administrator needs to enter the enabel command and press the Enter key:
Router> enableRouter#
Global Configuration Mode
In privil
options:
If the password is not encrypted, directly with more Nvram:startup-config command can see the password, in password encrypted case, cannot see, can only modify, enter the command as follows:
Router # Configure Memory
Router # Configure Terminal
and enter the rom status.
2) If the Break key has been blocked, you can use the cycle Boot Method to enter the rom status. The method is: after the vro is started, the power supply is turned off and the instance is restarted after 5 seconds, generally, it enters the rom status. This method applies to vrouters such as 7500 and 12000.
3) set the baud rate of the Super Terminal to 1200, data bit 8, parity bit 1, stop bit none. Turn on the router power,
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 pass
(config)# ctrl-z Router # write memory
11. Enter configure terminal at the EXEC prompt to enter the configuration mode. Enter the config-register command to restore the register value recorded in step 2.
12. Press Ctrl-Z to exit the configuration.
13. In privileged mode, run the write memory command to save the configuration and restart reboot.
Method 2
This method restores the following vrouters: Cisco
Configuring a password for a Cisco router is a headache for common users. Here we will teach you how to configure a password for a Cisco router to bypass the vulnerability, cisco PIX, A
Password Recovery principle of the Cisco router-the Cisco router stores several different configuration parameters and stores them in different memory modules. The introduction is as follows: ---- · internal memory type ---- Cisco2500 series routers have five types of memory
At present, there are many users using CISCO routers, so today we will introduce in detail the main steps for configuring the CISCO Router password and what we need to pay special attention to. I hope this will help you, I hope you will learn more after reading the article. In CISC
) # enable secret 1234ABCD
Router (config) # ctrl-z
Router # Write memory
11. Enter configure terminal into configuration mode at the exec prompt. Enter the Config-register command to restore the register value recorded in the second step.
12. Knock Ctrl-z, exit configuration status.
13. In privileged mode, save the configuration with the Write Memory command, and then reboot reboot.
The second method
(config) # ctrl-z
Router # write memory
11. Enter configure terminal at the EXEC prompt to enter the configuration mode. Enter the config-register command to restore the register value recorded in step 2.
12. Press Ctrl-Z to exit the configuration.
13. In privileged mode, run the write memory command to save the configuration and restart reboot.
Method 2
This method restores the following vrouters: Cisco 1
In CISCO router products, we usually need to restrict the access of general users during initial configuration. This is very important for Routers. By default, Our routers are an open system and the access control options are all disabled, any user can log on to the device to initiate further attacks, therefore, our network administrator needs to configure a password
boot from the flash memory, o/r0x41 meaning to boot from the ROMs (note that the first character is the letter O, not the number 0). Better use 0x42,
In the case of flash memory is not installed or erase, only use 0x41, if there is 0x41 can only view or erase configuration, can not directly change the password.
6. Enter the initialization command at the rommon> prompt.
7. Enter the System configuration
The company's GPS patrol system needs to go WVPDN to communicate, but before looking for a telecommunications took a CISCO2811, collapsed once, the 2811 is the telecommunications sent, the estimated quality is not how, and then to find the company to buy the same type of equipment, 2811 discontinued, on the Cisco 2911.Yesterday arrived Ah, excited a bit, super terminal connected on, looked at the system configuration, the result of the hand is cheap,
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