[rancid] Rollback functionality and potential pitfalls

Paul Magee pmagee at williamhill.co.uk
Wed Feb 13 12:20:50 UTC 2013


I'd also take this approach

-----Original Message-----
From: rancid-discuss-bounces at shrubbery.net [mailto:rancid-discuss-bounces at shrubbery.net] On Behalf Of Miles Lott
Sent: 12 February 2013 20:28
To: rancid-discuss at shrubbery.net
Subject: Re: [rancid] Rollback functionality and potential pitfalls

Seems like it might be better to just overwrite running or startup 
configs using copy from tftp.  Or maybe I am missing your point.

On 02/12/2013 10:04 AM, Ramon wrote:
> Hello all,
> I am currently looking in to a way to implement rollback functionality 
> using rancid. What would it take to reverse bad changes and restore 
> the config of a cisco device back to a previous saved version?
> I ask because just pushing the original config on top of the modified 
> version would not remove or flush out certain statements, possibly 
> leaving duplicates that would have to be removed manually.
> My first idea was to create a negative file, by generating a "no 
> statement" for every line in the new config that does not match the 
> old config. After pushing the negative file and removing the changes I 
> would push the old config to restore any of the deleted statements.
> Feedback on any foreseeable issues such as possible hierarchical 
> problems (interfaces, acls, bgp) would be very welcomed.
> Thanks,
> Ramon

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