Cisco Rollback Configuration

Hi weekender's (guys is enjoy weekend), I just complete previous posting.

It's very easy to rollback Cisco IOS software configuration. But you must enable archive feature first before can use rollback feature. Please find Cisco Archive Config to enable. To rollback configuration from archive copy archive config to running-config.

IOS#conf t
Enter configuration commands, one per line.  End with CNTL/Z.
IOS(config)#hostname IOOS
IOOS(config)#exit

IOOS#show archive config differences disk0:/-1 
Contextual Config Diffs:
+hostname IOS
-hostname IOOS

IOOS#copy disk0:/-1 running-config
Destination filename [running-config]? 

2248 bytes copied in 0.680 secs (3306 bytes/sec)
IOS#

The EPS Bearer Flow

Please find the picture of EPS Bearer flow as complement previous posting about LTE EPS Bearer Flow.

Cisco Archive Config (Automatic Backup Config)

Cisco IOS Software by default doesn't enable archive config feature. What is for this feature ? It's very usefull to always save config whenever you modify. I can say it's automatic backup config when modify happen. What is trigger configuration is change in IOS software ? Saving (write memory). Every time 'write memory' is execute, IOS will be copy configuration from running-config to startup-config. We use that trigger to backup configuration to another file every time 'write memory' is execute.

# Enable archive #

IOS#show archive 
 Archive feature not enabled

IOS(config)#
archive
 path disk0:/
 write-memory

IOS#show archive 
There are currently 1 archive configurations saved.
The next archive file will be named disk0:/-1
 Archive #  Name
   0        
   1        
   2        
   3        
   4        
   5        
   6        
   7        
   8        
   9        
   10        
   11        
   12        
   13        
   14        

# Make manual archive or backup running-config #

IOS#archive config 

IOS#show archive 
There are currently 2 archive configurations saved.
The next archive file will be named disk0:/-2
 Archive #  Name
   0        
   1       disk0:/-1 <- font="" most="" recent="">
   2        
   3        
   4        
   5        
   6        
   7        
   8        
   9        
   10        
   11        
   12        
   13        
   14        

# Automatic make archive (backup) when write memory #

IOS#write memory 
Building configuration...
[OK]

IOS#show archive 
There are currently 3 archive configurations saved.
The next archive file will be named disk0:/-3
 Archive #  Name
   0        
   1       disk0:/-1 
   2       disk0:/-2 <- font="" most="" recent="">
   3        
   4        
   5        
   6        
   7        
   8        
   9        
   10        
   11        
   12        
   13        
   14        

Why are we need to archive config ? 
We can rollback configuration from archive anytime, copy archive config to running-config even archive config save 14 configuration.

Have fun, I hope it usefull.