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Cisco 2911 router

Hi there,
I am running Cisco 2911 router.  I would like to test an internet connection from a new ISP.  Can we make 2 configurations on a router? so that if by any chance I did not like the service of the ISP I can quickly go back to my existing configuration?  OR please suggest an easy route I can take keeping in mind I do not want to touch the existing config but also would want to Test the new connection (the new ISP will give me some new static IPs)
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amanzoor
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amanzoor
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1 Solution
 
Istvan KalmarCommented:
Hi,

I seemss tahat you need to reconfgiure the ip address of outside interface... and claer the nat table...

please show the config
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Istvan KalmarCommented:
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L4NetCommented:
There might be a better way out there... but I've carried out similar experiments using multiple config files and a TFTP server.  Make sure the TFTP server is working well before changing configs, though.  Once you know you can copy the running config to and from TFTP, you're ready. ** This only works assuming the internal IP's aren't changing.

From that TFTP folder on whatever TFTP server you're using, create a copy of the running config file (or start with a blank config file).  Using a copy of the current running config is safer because you know it doesn't modify the internal interfaces settings (allowing you to reconnect easily after changing config file).

Get the test config all set and the way you want it with the new settings for the external interface (new ISP).  Now telnet into the router use the copy commend to bring that new config into the router, make sure cabling is hooked up for new ISP and you're ready to test.

Router#copy tftp start
Address or name of remote host []? "your TFTP ip address"
Source filename []? "your new test config"
Destination filename [running-config]?
** when finished, use the RELOAD command to reload the config (now the new test config) from startup.

If the new config/ISP fail or don't meet your expectations, just use the same process to load up the original running config and reload.  You're all set!

Router#copy tftp start
Address or name of remote host []? "your TFTP ip address"
Source filename []? "your new test config"
Destination filename [running-config]?
** when finished, use the RELOAD command to reload the config (now the new test config) from startup.
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L4NetCommented:
FOLLOWUP...

That second section of commands was to reload your original config.  I mistyped there so the steps should look like this.

Router#copy tftp start
Address or name of remote host []? "your TFTP ip address"
Source filename []? "your originalconfig"
Destination filename [startup-config]?
** when finished, use the RELOAD command to reload the config (now the new test config) from startup.

Sorry for the typos...  
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