How to Clear Switch Configuration: Difference between revisions

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'''To clear switch configuration'''
To clear switch configuration you need access to the Cisco Catalyst Switch console through either a physical console or a Telnet connection.


Issue the erase starting-config command.
== Clear switch configuration ==
 
Issue the erase starting-config command in Privileged EXEC mode.


Switch#erase startup-config
Switch#erase startup-config


Erasing the nvram filesystem will remove all configuration files! Continue? [confirm]
Erasing the nvram filesystem will remove all configuration files! Continue? [confirm]
[OK]
[OK]
Erase of nvram: complete
Erase of nvram: complete
Switch#
Switch#
 
At this stage, the switch configuration has reset to the factory defaults, with the exclusion of the VLAN information. VLANs are kept in a seperate file from the startup-config (NVRAM).
 


At this stage, the switch configuration is cleared except the VLAN information. VLANs are kept in a seperate file from the startup-config (NVRAM).


'''To verify the VLAN information'''
== Verify the VLAN information Before deletion ==


Issue the show vlan brief command
Issue the show vlan brief command in Privileged EXEC mode.


Switch#show vlan brief
Switch#show vlan brief
Line 37: Line 37:
  1004 fddinet-default                  act/unsup
  1004 fddinet-default                  act/unsup
  1005 trnet-default                    act/unsup
  1005 trnet-default                    act/unsup
Switch#


Switch#


'''Delete the VLAN information from Flash'''
== Delete the VLAN information from Flash ==


Switch#delete flash:vlan.dat
Switch#delete flash:vlan.dat
Delete filename [vlan.dat]?
Delete filename [vlan.dat]?
Delete flash:vlan.dat? [confirm]
Delete flash:vlan.dat? [confirm]
Switch#


Switch#
At the prompt press Enter.


'''Reload the switch'''
 
== Reload the switch ==


Do not save at the prompt. Otherwise, the switch  reloads with the current running configuration and does not clear the switch configuration.
Do not save at the prompt. Otherwise, the switch  reloads with the current running configuration and does not clear the switch configuration.
Line 54: Line 56:
Switch#reload
Switch#reload


System configuration has been modified. Save? [yes/no]: n
----
Proceed with reload? [confirm]
 
 
<output omitted>
 
 
 
 
Would you like to terminate autoinstall? [yes]: y
 
 
        --- System Configuration Dialog ---
 
Would you like to enter the initial configuration dialog? [yes/no]: n
Switch>


System configuration has been modified. Save? [yes/no]: n
Proceed with reload? [confirm]
<output omitted>
Would you like to terminate autoinstall? [yes]: y
      --- System Configuration Dialog ---
Would you like to enter the initial configuration dialog? [yes/no]: n
Switch>


----


'''After reload'''
== After reload check the vlan information ==
   
   
check the VLAN information with the show vlan brief command.
check the VLAN information with the show vlan brief command.

Latest revision as of 04:27, 17 October 2010

To clear switch configuration you need access to the Cisco Catalyst Switch console through either a physical console or a Telnet connection.

Clear switch configuration

Issue the erase starting-config command in Privileged EXEC mode.

Switch#erase startup-config

Erasing the nvram filesystem will remove all configuration files! Continue? [confirm]
[OK]
Erase of nvram: complete
Switch#

At this stage, the switch configuration is cleared except the VLAN information. VLANs are kept in a seperate file from the startup-config (NVRAM).

Verify the VLAN information Before deletion

Issue the show vlan brief command in Privileged EXEC mode.

Switch#show vlan brief

VLAN Name                             Status    Ports
---- -------------------------------- --------- -------------------------------
1    default                          active    Fa0/1, Fa0/2, Fa0/3, Fa0/4
                                               Fa0/5, Fa0/6, Fa0/7, Fa0/8
                                               Fa0/9, Fa0/10, Fa0/11, Fa0/12
                                               Fa0/13, Fa0/14, Fa0/15, Fa0/16
                                               Fa0/17, Fa0/18, Fa0/19, Fa0/20
                                               Fa0/21, Fa0/22, Fa0/23, Fa0/24
                                               Gi0/1, Gi0/2
10   Faculty/Staff                    active
20   Students                         active
30   Wireless                         active
99   Management                       active
1002 fddi-default                     act/unsup
1003 token-ring-default               act/unsup
1004 fddinet-default                  act/unsup
1005 trnet-default                    act/unsup
Switch#


Delete the VLAN information from Flash

Switch#delete flash:vlan.dat

Delete filename [vlan.dat]?
Delete flash:vlan.dat? [confirm]
Switch# 

At the prompt press Enter.


Reload the switch

Do not save at the prompt. Otherwise, the switch reloads with the current running configuration and does not clear the switch configuration.

Switch#reload


System configuration has been modified. Save? [yes/no]: n
Proceed with reload? [confirm]
<output omitted>
Would you like to terminate autoinstall? [yes]: y
      --- System Configuration Dialog ---
Would you like to enter the initial configuration dialog? [yes/no]: n
Switch>

After reload check the vlan information

check the VLAN information with the show vlan brief command.

Switch#show vlan brief

VLAN Name                             Status    Ports
---- -------------------------------- --------- -------------------------------
1    default                          active    Fa0/1, Fa0/2, Fa0/3, Fa0/4
                                               Fa0/5, Fa0/6, Fa0/7, Fa0/8
                                               Fa0/9, Fa0/10, Fa0/11, Fa0/12
                                               Fa0/13, Fa0/14, Fa0/15, Fa0/16
                                               Fa0/17, Fa0/18, Fa0/19, Fa0/20
                                               Fa0/21, Fa0/22, Fa0/23, Fa0/24
                                               Gi0/1, Gi0/2
1002 fddi-default                     act/unsup
1003 token-ring-default               act/unsup
1004 fddinet-default                  act/unsup
1005 trnet-default                    act/unsup

Compiled Thu 19-Jul-07 20:06 by nachen