Rolling Back a Configuration

Have you ever been on your GradedLabs rack of equipment and wanted to test a particular feature or set of configurations, but you certainly do not want to keep these changes on the rack? Perhaps this is because you are right in the middle of solving a Volume 2 lab and you certainly cannot have that configuration impacted.

Thanks to the very handy config replace command, you can easily rollback almost instantly to your previous saved configuration after your experimenting. Here is a demonstration of just how simple this is. Enjoy, and let us give thanks for all there is to learn on blog.ine.com! :-) I also want to thank my good friend Keith Barker for first showing me this one.

Rack29R1#configure terminal

Enter configuration commands, one per line. End with CNTL/Z.

Rack29R1(config)#hostname TEST

TEST(config)#interface fastethernet0/0

TEST(config-if)#ip address 1.2.3.4 255.0.0.0

TEST(config-if)#no shut

TEST(config-if)#end

TEST#

Nov 25 09:09:58.856: %LINK-3-UPDOWN: Interface FastEthernet0/0, changed state to

Nov 25 09:09:59.173: %SYS-5-CONFIG_I: Configured from console by console

TEST#configure terminal

Nov 25 09:10:01.404: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEtherne

t0/0, changed state to up

TEST#config replace nvram:startup-config force

Total number of passes: 1

Rollback Done

Rack29R1#

Nov 25 09:10:08.644: Rollback:Acquired Configuration lock.

Nov 25 09:10:17.827: %LINK-5-CHANGED: Interface FastEthernet0/0, changed state t

o administratively down

Nov 25 09:10:18.829: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEtherne

t0/0, changed state to down

Rack29R1#

Nov 25 09:10:22.727: %PARSER-3-CONFIGNOTLOCKED: Unlock requested by process '3'.

Configuration not locked.

Rack29R1#

Rack29R1#configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
Rack29R1(config)#hostname TEST
TEST(config)#interface fastethernet0/0
TEST(config-if)#ip address 1.2.3.4 255.0.0.0
TEST(config-if)#no shut
TEST(config-if)#end
TEST#
TEST#config replace nvram:startup-config force
Total number of passes: 1
Rollback Done
Rack29R1#
Rack29R1#show run interface fa0/0
Building configuration...
Current configuration : 83 bytes
!
interface FastEthernet0/0

no ip address
shutdown
duplex auto
speed auto
end

Rack29R1#