Cisco как установить пароль на роутере

When you start a
session on a router, you generally begin in
user EXEC mode ,
which is one of two access levels of the EXEC mode. For security purposes, only
a limited subset of EXEC commands are available in user EXEC mode. This level
of access is reserved for tasks that do not change the configuration of the
router, such as determining the router status.

If your device is
configured to require users to log-in the log-in process will require a
username and a password. You may try three times to enter a password before the
connection attempt is refused.

User EXEC mode is set by default to privilege level 1. Privileged EXEC mode is set by default to privilege level 15. When
you are logged into a networking device in user EXEC mode your session is running at privilege level 1. By default the EXEC
commands at privilege level 1 are a subset of those available at privilege level 15. When you are logged into a networking
device in privileged EXEC mode your session is running at privilege level 15. You can move commands to any privilege level
between 1 and 15 using the privilege command.

In general, the user
EXEC commands allow you to connect to remote devices, change terminal line
settings on a temporary basis, perform basic tests, and list system
information.

To list the available
user EXEC commands, use the following command:

Device(config)# ? 

The user EXEC mode
prompt consists of the host name of the device followed by an angle bracket
(>), as shown in the following example:

Device>

The default host name
is generally Router, unless it has been changed during initial configuration
using the
setup EXEC
command. You also change the host name using the
hostname global configuration command.

Note

Examples in Cisco IOS XE documentation assume the use of the default name of “Device.” Different devices (for example, access servers) may use a different default name. If the device (router, access server, or switch) has been named with the hostname command, that name will appear as the prompt instead of the default name.

To list the commands
available in user EXEC mode, enter a question mark (? ) as shown in the following example:

Device> ?
 
Exec commands:
 <1-99>           Session number to resume
 connect          Open a terminal connection
 disconnect       Disconnect an existing telnet session
 enable           Turn on privileged commands
 exit             Exit from Exec mode
 help             Description of the interactive help system
 lat              Open a lat connection
 lock             Lock the terminal
 login            Log in as a particular user
 logout           Exit from Exec mode and log out
 menu             Start a menu-based user interface
 mbranch          Trace multicast route for branch of tree
 mrbranch         Trace reverse multicast route to branch of tree
 mtrace           Trace multicast route to group
 name-connection  Name an existing telnet connection
 pad              Open a X.29 PAD connection
 ping             Send echo messages
 resume           Resume an active telnet connection
 show             Show running system information
 systat           Display information about terminal lines
 telnet           Open a telnet connection
 terminal         Set terminal line parameters
 tn3270           Open a tn3270 connection
 trace            Trace route to destination
 where            List active telnet connections
 x3               Set X.3 parameters on PAD

The list of commands
will vary depending on the software feature set and platform you are using.

Note	You can enter commands in uppercase, lowercase, or mixed case. Only passwords are case sensitive. However, Cisco IOS XE documentation convention is to always present commands in lowercase.

In order to have
access to all commands, you must enter
privileged EXEC
mode , which is the second level of access for the EXEC mode. Normally, you
must enter a password to enter privileged EXEC mode. In privileged EXEC mode,
you can enter any EXEC command, because privileged EXEC mode is a superset of
the user EXEC mode commands.

Because many
privileged EXEC mode commands set operating parameters, privileged EXEC level
access should be password protected to prevent unauthorized use. The privileged
EXEC command set includes those commands contained in user EXEC mode.
Privileged EXEC mode also provides access to configuration modes through the
configure command, and includes advanced testing
commands, such as
debug .

Privileged EXEC mode is set by default to privilege level 15. User EXEC mode is set by default to privilege level 1. For
more information see the User EXEC Mode. When you are logged into a networking device in privileged EXEC mode your session is running at privilege level 15. When
you are logged into a networking device in user EXEC mode your session is running at privilege level 1. By default the EXEC
commands at privilege level 15 are a superset of those available at privilege level 1. You can move commands to any privilege
level between 1 and 15 using the privilege command. See the Cisco IOS XE Privilege Levels for more information on privilege levels and the privilege command.

The privileged EXEC
mode prompt consists of the host name of the device followed by a pound
sign(#), as shown in the following example:

Device#

To access privileged
EXEC mode, use the following command:

Device> enable 

Password

Device# exit 

Device>

Note	Privileged EXEC mode is sometimes referred to as “enable mode,” because the enable command is used to enter the mode.

If a password has
been configured on the system, you will be prompted to enter it before being
allowed access to privileged EXEC mode. The password is not displayed on the
screen and is case sensitive. If an enable password has not been set,
privileged EXEC mode can be accessed only by a local CLI session (terminal
connected to the console port).

If you attempt to access privileged EXEC mode on a router over a remote connection, such as a telnet connection, and you
have not configured a password for privileged EXEC mode you will see the %
No
password
set error message. For more information on remote connections see the Remote CLI Sessions. The system administrator uses the enable
secret or enable
password global configuration commands to set the password that restricts access to privileged EXEC mode. For information on configuring
a password for privileged EXEC mode, see the Protecting Access to Privileged EXEC Mode.

To return to user
EXEC mode, use the following command:

Device# disable 

The following example
shows the process of accessing privileged EXEC mode:

Device> enable
Password:<letmein>
Device# 

Note that the
password will not be displayed as you type, but is shown here for
illustrational purposes. To list the commands available in privileged EXEC
mode, issue the
? command at
the prompt. From privileged EXEC mode you can access global configuration mode,
which is described in the following section.

Note

Because the privileged EXEC command set contains all of the commands available in user EXEC mode, some commands can be entered in either mode. In Cisco IOS XE documentation, commands that can be entered in either user EXEC mode or privileged EXEC mode are referred to as EXEC mode commands. If user or privileged is not specified in the documentation, assume that you can enter the referenced commands in either mode.

The term “global” is
used to indicate characteristics or features that affect the system as a whole.
Global configuration mode is used to configure your system globally, or to
enter specific configuration modes to configure specific elements such as
interfaces or protocols. Use the
configure
terminal privileged EXEC command to enter global
configuration mode.

To access global
configuration mode, use the following command in privileged EXEC mode:

Device#
 configure terminal 

The following example
shows the process of entering global configuration mode from privileged EXEC
mode:

Device# configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
Device(config)#

Note that the system
prompt changes to indicate that you are now in global configuration mode. The
prompt for global configuration mode consists of the host-name of the device
followed by (config) and the pound sign ( # ). To list the commands available
in privileged EXEC mode, issue the
? command at
the prompt.

Commands entered in
global configuration mode update the running configuration file as soon as they
are entered. In other words, changes to the configuration take effect each time
you press the Enter or Return key at the end of a valid command. However, these
changes are not saved into the startup configuration file until you issue the
copy
running-config
startup-config EXEC mode command. This behavior is
explained in more detail later in this document.

As shown in the
example above, the system dialogue prompts you to end your configuration
session (exit configuration mode) by pressing the Control (Ctrl) and “z” keys
simultaneously; when you press these keys,
^Z is printed
to the screen. You can actually end your configuration session by entering the
Ctrl-Z key combination, using the
end command,
using the Ctrl-C key combination. The
end command is
the recommended way to indicate to the system that you are done with the
current configuration session.

Caution

If you use Ctrl-Z at the end of a command line in which a valid command has been typed, that command will be added to the running configuration file. In other words, using Ctrl-Z is equivalent to hitting the Enter (Carriage Return) key before exiting. For this reason, it is safer to end your configuration session using the end command. Alternatively, you can use the Ctrl-C key combination to end your configuration session without sending a Carriage Return signal.

You can also use the
exit command to
return from global configuration mode to EXEC mode, but this only works in
global configuration mode. Pressing Ctrl-Z or entering the
end command
will always take you back to EXEC mode regardless of which configuration mode
or configuration submode you are in.

To exit global
configuration command mode and return to privileged EXEC mode, use one of the
following commands:

Device(config)# end 

Device(config)# ^Z 

Device(config)# exit 

From global
configuration mode, you can enter a number of protocol-specific,
platform-specific, and feature-specific configuration modes.

Interface
configuration mode, described in the following section, is an example of a
configuration mode you can enter from global configuration mode.

One example of a
specific configuration mode you enter from global configuration mode is
interface configuration mode.

Many features are
enabled on a per-interface basis. Interface configuration commands modify the
operation of an interface such as an Ethernet, FDDI, or serial port. Interface
configuration commands always follow an
interface
global configuration command, which defines the interface type.

For details on
interface configuration commands that affect general interface parameters, such
as bandwidth or clock rate, refer to the Release 12.2
Cisco IOS Interface
Configuration Guide . For protocol-specific commands, refer to the
appropriate Cisco IOS XE software command reference.

To access and list
the interface configuration commands, use the following command:

Device(config)# interface  type number

In the following
example, the user enters interface configuration mode for serial interface 0.
The new prompt,
hostname
(config-if)#, indicates interface configuration mode.

Device(config)# interface serial 0
Device(config-if)#

To exit interface
configuration mode and return to global configuration mode, enter the
exit command.

Configuration
submodes are configuration modes entered from other configuration modes
(besides global configuration mode). Configuration submodes are for the
configuration of specific elements within the configuration mode. One example
of a configuration submode is subinterface configuration mode, described in the
following section.

From interface
configuration mode, you can enter subinterface configuration mode. Subinterface
configuration mode is a submode of interface configuration mode. In
subinterface configuration mode you can configure multiple virtual interfaces
(called subinterfaces) on a single physical interface. Subinterfaces appear to
be distinct physical interfaces to the various protocols.

For detailed
information on how to configure subinterfaces, refer to the appropriate
documentation module for a specific protocol in the Cisco IOS XE software
documentation set.

To access
subinterface configuration mode, use the following command in interface
configuration mode:

Device(config-if)# interface  type  number 

In the following
example, a subinterface is configured for serial line 2, which is configured
for Frame Relay encapsulation. The subinterface is identified as “2.1” to
indicate that it is subinterface 1 of serial interface 2. The new prompt
hostname
(config-subif)# indicates subinterface configuration mode. The subinterface can
be configured to support one or more Frame Relay PVCs.

Device(config)# interface serial 2
Device(config-if)# encapsulation frame-relay
Device(config-if)# interface serial 2.1
Device(config-subif)#

To exit subinterface
configuration mode and return to interface configuration mode, use the
exit command.
To end your configuration session and return to privileged EXEC mode, press
Ctrl-Z or enter the
end command.

Local CLI sessions require direct access to the the console port of the networking device. Local CLI sessions start in user
EXEC mode. All of the tasks required to configure and manage a networking device can be done using a local CLI session. The
most common method for establishing a local CLI session is to connect the serial port on a PC to the console port of the networking
device and then to launch a terminal emulation application on the PC. The type of cable and connectors required and the settings
for the terminal emulation application on the PC are dependant on the type of networking device that you are configuring.
See to the documentation for your networking device for more information on setting it up for a local CLI session.

Remote CLI sessions are created between a host such as a PC and a networking device such as a router over a network using
a remote terminal access application such as Telnet and Secure Shell (SSH). Local CLI sessions start in user EXEC mode. Most
of the tasks required to configure and manage a networking device can be done using a remote CLI session. The exceptions are
tasks that interact directly with the console port (such as recovering from a corrupted operating system (OS) by uploading
a new OS image over the console port) and interacting with the networking device when it is in ROM Monitor Mode.

This document explains how to configure security for remote Telnet sessions. Telnet is the most common method for accessing
a remote CLI session on a networking device.

Note

SSH is a more secure alternative to Telnet. SSH provides encryption for the session traffic between your local management device such as a PC and the networking device that you are managing. Encrypting the session traffic with SSH prevents hackers that might intercept the traffic from being able to decode it. See Secure Shell Version 2 Support feature module for more information on using SSH.

Cisco networking
devices use the word lines to refer to the software components that manage
local and remote CLI sessions. You use the
line
console
0 global
configuration command to enter line configuration mode to configure options,
such as a password, for the console port.

Device# configure terminal
Device(config)# line console 0
Device(config-line)# password password-string 

Remote CLI sessions
use lines that are referred to virtual teletypewriter (VTY) lines. You use the
line
vty
line-number
[ending-line-number ] global configuration command
to enter line configuration mode to configure options, such as a password, for
remote CLI sessions.

Device# configure terminal
Device(config)# line vty 0 4 
Device(config-line)# password password-string 

The first step in creating a secure environment for your networking device is protecting access to user EXEC mode by configuring
passwords for local and remote CLI sessions.

You protect access to user EXEC mode for local CLI sessions by configuring a password on the console port. See the Configuring and Verifying a Password for Local CLI Sessions.

You protect access to user EXEC mode for remote CLI sessions by configuring a password on the virtual terminal lines (VTYs).
See the Configuring and Verifying a Password for Remote CLI Sessions for instructions on how to configure passwords for remote CLI sessions.

The second step in
creating a secure environment for your networking device is protecting access
to privileged EXEC mode with a password. The method for protecting access to
privileged EXEC mode is the same for local and remote CLI sessions.

You protect access to
privileged EXEC mode by configuring a password for it. This is sometimes
referred to as the enable password because the command to enter privileged EXEC
mode is
enable .

Device> enable

Password 

Device#

Before you begin

If you have not
previously configured a password for remote CLI sessions, you must perform this
task over a local CLI session using a terminal or a PC running a terminal
emulation application, attached to the console port.

Your terminal, or
terminal emulation application, must be configured with the settings that are
used by the console port on the networking device. The console ports on most
Cisco networking devices require the following settings: 9600 baud, 8 data
bits, 1 stop bit, no parity, and flow control is set to «none.» See the
documentation for your networking device if these settings do not work for your
terminal.

To perform the
verification step (Step 6) for this task, your networking device must have an
interface that is in an operational state. The interface must have a valid IP
address.

Note	If you have not previously configured a password for remote CLI sessions, you must perform this task over a local CLI session using a terminal attached to the console port.

SUMMARY STEPS

1. enable

2. configure
   terminal

3. line
   vty
   line-number
   [ending-line-number ]

4. password
   password

5. end

6. telnet
   ip-address

7. exit

DETAILED STEPS

Device> enable

Device# configure terminal

Device(config)# line vty 0 4

Device(config-line)# password H7x3U8

Device(config-line)# end

Device# telnet 172.16.1.1

Device# exit

SUMMARY STEPS

1. enable

2. configure
   terminal

3. line
   console
   0

4. password
   password

5. end

6. exit

7. Press the Enter
   key.

DETAILED STEPS

Device> enable

Device# configure terminal

Device(config)# line console 0

Device(config-line)# password Ji8F5Z

Device(config-line)# end

Device# exit

Cisco no longer
recommends that you use the
enable
password
command to configure a password for
privileged EXEC mode. The password that you enter with the
enable
password
command is stored as plain text in the configuration file of the networking
device. You can encrypt the password for the
enable
password
command in the configuration file of the networking device using the
service
password-encryption command. However the
encryption level used by the
service
password-encryption command can be decrypted using
tools available on the Internet.

Instead of using the enable
password command, Cisco recommends using the enable
secret command because it encrypts the password that you configure with it with strong encryption . For more information on password encryption
issues see the Cisco IOS XE Password Encryption Levels. For information on configuring the enable
secret command see the Configuring and Verifying the Enable Secret Password.

Note

The networking device must not have a password configured by the enable secret command in order to perform this task successfully. If you have already configured a password for privileged EXEC mode using the enable secret command, the password configured takes precedences over the password that you configure in this task using the enable password command. You cannot use the same password for the enable secret command and the enable password command.

SUMMARY STEPS

1. enable

2. configure
   terminal

3. enable
   password
   password

4. end

5. exit

6. enable

DETAILED STEPS

Device> enable

Device# configure terminal

Device(config)# enable password t6D77CdKq

Device(config)# end

Device# exit

Device> enable

SUMMARY STEPS

1. enable

2. configure
   terminal

3. service
   password-encryption

4. end

DETAILED STEPS

Device> enable

Device# configure terminal

Device(config)# service password-encryption

Device(config)# end

Cisco recommends
that you use the
enable
secret command, instead of the
enable
password
command to configure a password for privileged EXEC mode. The password created
by the
enable
secret command is encrypted with the more secure
MD5 algorithm.

Note	You cannot use the same password for the enable secret command and the enable password command.

SUMMARY STEPS

1. enable

2. configure
   terminal

3. Perform one of the
   following steps:

• enable
  secret
  password

• enable
  secret
  5
  previously-encrypted-password

4. end

5. exit

6. enable

DETAILED STEPS

Device> enable

Device# configure terminal

Device(config)# enable secret t6D77CdKq

Device(config)# enable secret 5 $1$/x6H$RhnDI3yLC4GA01aJnHLQ4/

Device(config)# end

Device# exit

Device> enable

SUMMARY STEPS

1. enable

2. configure
   terminal

3. privilege exec all level
   level
   command-string

4. file privilege
   level

5. privilege configure all level
   level
   command-string

6. end

7. show privilege

8. show running-config

DETAILED STEPS

Device> enable

Device# configure terminal

Device(config)# privilege exec all level 5 show running-config

Device(config)# file privilege 5

Device(config)# privilege configure all level 5 logging

Device(config)# end

Device# show privilege

Device# show running-config

Device# show running-config

Building configuration...
 
Current configuration : 128 bytes
!
boot-start-marker
boot-end-marker
!
no logging queue-limit
logging buffered 10000000
no logging rate-limit
!
!
!
end

This task describes
how to configure the networking device for first-line technical support users.
First-line technical support staff are usually not allowed to run all of the
commands available in privileged EXEC mode (privilege level 15) on a networking
device. They are prevented from running commands that they are not authorized
for by not being granted access to the password assigned to privileged EXEC
mode or to other roles that have been configured on the networking device.

The
privilege
command is used to move commands from one privilege level to another in order
to create the additional levels of administration of a networking device that
is required by companies that have different levels of network support staff
with different skill levels.

The default
configuration of a Cisco IOS XE device permits two types of users to access the
CLI. The first type of user is a person who is only allowed to access user EXEC
mode. The second type of user is a person who is allowed access to privileged
EXEC mode. A user who is only allowed to access user EXEC mode is not allowed
to view or change the configuration of the networking device, or to make any
changes to the operational status of the networking device. On the other hand,
a user who is allowed access to privileged EXEC mode can make any change to a
networking device that is allowed by the CLI.

In this task the
two commands that normally run at privilege level 15 are reset to privilege
level 7 using the privilege command in order that first-line technical support
users will be allowed to run the two commands. The two commands for which the
privilege levels will be reset are the
clear
counters
command and
reload command.

• The
  clear
  counters
  command is used to reset the counter fields on interfaces for statistics such
  as packets received, packets transmitted, and errors. When a first-line
  technical support user is troubleshooting an interface related connectivity
  issue between networking devices, or with remote users connecting to the
  network, it is useful to reset the interface statistics to zero and them
  monitor the interfaces for a period of time to see if the values in the
  interface statistics counters change.

• The
  reload command
  is used initiate a reboot sequence for the networking device. One common use of
  the reload command by first-line technical support staff is to cause the
  networking device to reboot during a maintenance window so that it loads a new
  operating system that was previously copied onto the networking device’s file
  system by a user with a higher level of authority.

Any user that is permitted to know the enable
secret password that is assigned to the first-line technical support user role privilege level can access the networking device
as a first-line technical support user. You can add an additional level of security by configuring a username on the networking
device and requiring that the users know the username and the password. Configuring a username as an additional level of security
is described in the . Configuring a Device to Require a Username for the First-Line Technical Support Staff

Note

You must not have the aaa new-model command enabled on the networking device. You must not have the login local command configured for the local CLI sessions over the console port or the remote CLI sessions. Note For clarity, only the arguments and keywords that are relevant for each step are shown in the syntax for the steps in this task. See the Cisco IOS command reference book for your Cisco IOS release for further information on the additional arguments and keywords that can be used with these commands. Caution Do not use the no form of the privilege command to reset the privilege level of a command to its default because it might not return the configuration to the correct default state. Use the reset keyword for the privilege command instead to return a command to its default privilege level. For example, to remove the privilege exec level reload command from the configuration and return the reload command to its default privilege of 15, use the privilege exec reset reload command.

SUMMARY STEPS

1. enable

2. configure
   terminal

3. enable
   secret
   level
   level
   password

4. privilege
   exec
   level
   level
   command-string

5. end

DETAILED STEPS

Device> enable

Device# configure terminal

Device(config)# enable secret level 7 Zy72sKj

Device(config)# privilege exec level 7 clear counters

Device(config)# end

SUMMARY STEPS

1. enable
   level
   password

2. show
   privilege

3. clear
   counters

4. clear
   ip
   route
   *

5. reload
   in
   time

6. reload
   cancel

7. disable

8. show
   privilege

DETAILED STEPS

Device> enable 7 Zy72sKj

Device# show privilege

Current privilege level is 7

Device# clear counters 

Clear "show interface" counters on all interfaces [confirm]
Device#
02:41:37: %CLEAR-5-COUNTERS: Clear counter on all interfaces by console

Device# clear ip route *
                                                                     ^
% Invalid input detected at '^' marker.

Device# reload in
 
10
Reload scheduled in 10 minutes by console
Proceed with reload? [confirm]

Device#

***
*** --- SHUTDOWN in 0:10:00 ---
***
02:59:50: %SYS-5-SCHEDULED_RELOAD: Reload requested for 23:08:30 PST Sun Mar 20

Device# reload cancel

***
*** --- SHUTDOWN ABORTED ---
***
04:34:08: %SYS-5-SCHEDULED_RELOAD_CANCELLED:  Scheduled reload cancelled at 15:38:46 PST Sun Mar 27 2005

Device# disable

Device> show privilege

Current privilege level is 1

Before you begin

The following
commands must have been modified to run at privilege level 7 for this task:

• clear
  counters

• reload

See the Configuring the Networking Device for the First-Line Technical Support Staff for instructions on how to change the privilege level for a command.

Note

MD5 encryption for the username command is not supported in versions of Cisco IOS software prior to Cisco IOS XE Release 2.3. You must not have the aaa-new model command enabled on the networking device. You must not have the login local command configured for the local CLI sessions over the console port or the remote CLI sessions. Note For clarity, only the arguments and keywords that are relevant for each step are shown in the syntax for the steps in this task. Refer to the Cisco IOS command reference book for your Cisco IOS XE release for further information on the additional arguments and keywords that can be used with these commands.

SUMMARY STEPS

1. enable

2. configure
   terminal

3. username
   username
   privilege
   level
   secret
   password

4. end

5. disable

6. login
   username

7. show
   privilege

8. clear
   counters

9. clear
   ip
   route
   *

10. reload
    in
    time

11. reload
    cancel

12. disable

13. show
    privilege

DETAILED STEPS

Device> enable

Device# configure terminal

Device(config)# username admin privilege 7 secret Kd65xZa

Device(config)# end

Device# disable

Device> login admin

Device# show privilege

Current privilege level is 7

Device# clear counters

Clear "show interface" counters on all interfaces [confirm]
Device#
02:41:37: %CLEAR-5-COUNTERS: Clear counter on all interfaces by console

Device# clear ip route *
                                                                     ^
% Invalid input detected at '^' marker.

Device# reload in
 
10
Reload scheduled in 10 minutes by console
Proceed with reload? [confirm]
Device#
***
*** --- SHUTDOWN in 0:10:00 ---
***
02:59:50: %SYS-5-SCHEDULED_RELOAD: Reload requested for 23:08:30 PST Sun Mar 20

Device# reload cancel

***
*** --- SHUTDOWN ABORTED ---
***
04:34:08: %SYS-5-SCHEDULED_RELOAD_CANCELLED:  Scheduled reload cancelled at 15:38:46 PST Sun Mar 27 2005

Device# disable

Device> show privilege

Current privilege level is 1

The fastest method to recover from a lost, or misconfigured password for local CLI sessions is to establish a remote CLI
session with the networking device and repeat the Configuring and Verifying a Password for Local CLI Sessions. Your networking device must be configured to allow remote CLI sessions and you must know the remote CLI session password
to perform this procedure.

• If you cannot establish a remote session to your networking device, and you have not saved the misconfigured local CLI session
  password to the startup configuration, you can restart the networking device. When the networking device starts up again it
  will read the startup configuration file. The previous local CLI session password is restored.

Caution

Restarting a networking device will cause it to stop forwarding traffic. This will also cause an interruption in any services that are running on the networking device, such as a DHCP server service, to stop. You should only restart a networking device during a period of time that has been allocated for network maintenance.

The fastest method to recover from a lost, or misconfigured password for remote CLI sessions is to establish a local CLI
session with the networking device and repeat the Configuring and Verifying a Password for Remote CLI Sessions. Your networking device must be configured to allow local CLI sessions and you must know the local CLI session password to
perform this procedure.

• If you cannot establish a local CLI session to your networking device, and you have not saved the misconfigured remote CLI
  session password to the startup configuration, you can restart the networking device. When the networking device starts up
  again it will read the startup configuration file. The previous remote CLI session password is restored.

Caution

Restarting a networking device will cause it to stop forwarding traffic. This will also cause an interruption in any services that are running on the networking device, such as a DHCP server service, to stop. You should only restart a networking device during a period of time that has been allocated for network maintenance.

• If you have not saved the misconfigured privileged EXEC mode password to the startup configuration, you can restart the networking
  device. When the networking device starts up again it will read the startup configuration file. The previous privileged EXEC
  mode password is restored.

Caution

Restarting a networking device will cause it to stop forwarding traffic. This will also cause an interruption in any services that are running on the networking device, such as a DHCP server service, to stop. You should only restart a networking device during a period of time that has been allocated for network maintenance.