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multiple running config

aksher
Level 1
Level 1

can we have multiple running configurations?

25 Replies 25

Correct. "reload at" will force the router to boot of the last saved startup configuration.

What type of details are stored in Cisco 7613 router configuration file?Does it contain configuration of router itself such as router's personal IP address,start up details,boot sequence etc. or it contain details/database about routing tables,VLAN and IP addresses of VLANs connected with router?Is there any command to restore the router settings to a previously saved configuration file or previously saved database details like 20 days old backup?

You should connect to your 7613, and do a show run to get an idea of what you have configured there. Most of what you mention is typically contained in the running configuration. Of course, dynamically learned routes, and routing topology will not be there. There are other show commands that can get that information.

As for restoring an old config from 20 days ago, config archive offers this capability, but as I said, you must be running very new code on a 7600 to have this feature. Beyond that, external network management tools such as CiscoWorks RME offer configuration archive capabilities which can allow you to rollback to previous configs.

Just before doing reload at, is it advisible to do wr mem to write configuration,vlan information etc from memory to file?Thanks

Yes, you should write mem, then schedule the reload, then perform your questionable configuration changes.

I should also note that this kind of procedure should only be done as a last resort. The best way to test configuration changes is in a lab environment.

Any further suggestions, as we have a running/operational GPRS network using Cisco 7613, CPG3300. It have 13 routers and 2SUP.We need a rollback procedure before making any changes to VLAN and routing tables??

GGSN_1_13_2#show running-config

Building configuration...

Current configuration : 7750 bytes

!

! Last configuration change at 11:58:03 GMT Wed May 10 2006 by siemens

!

version 12.3

service timestamps debug datetime localtime show-timezone

service timestamps log uptime

service password-encryption

service gprs ggsn

!

Without knowing the _exact_ version of IOS, I cannot say if your device supports config archive and rollback. However, it does support "reload at" and you always have the option of using an external management system like CiscoWorks Resource Manager Essentials to do your configuration management.

I understand, is there any command through which we can simply see/check that when the last configuration was written from memory to file on disk?

Typically, a show run or show conf will give you this at the top of the config if the config was saved since the device was booted. For example:

!

! Last configuration change at 00:53:10 EST Sun Nov 12 2006

! NVRAM config last updated at 01:43:20 EST Sat Nov 11 2006

!

This indicates that the startup config was last modified on November 11 at 01:43:20. If the config has not been saved since the last reload, then you will not see a date in the show run/conf output, but you can use the show ver output to see when the device was last reloaded.

Problem with Cisco IOS structure is that it never saves different

versions

of the configuration. Only 2 copies running and startup so if you

didn't

save configuration then reload at will help only doing rollback with

startup

nothing else.

Automatically rolling back to different configuration versions was one of the problems config archive and rollback is supposed to solve. However, you can always choose to save multiple backups of a configuration and manually copy them back into the running-config. For example, to store an extra copy of the config to flash:

copy runn flash:config.bak

Then to restore that version:

copy flash:config.bak runn

This isn't a perfect rollback, but it will work for most commands.

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