[c-nsp] Disappearing Interfaces in config

Charles Sprickman spork at inch.com
Tue Oct 19 23:00:54 EDT 2004

On Mon, 18 Oct 2004, Jon Lewis wrote:

> On Mon, 18 Oct 2004, Church, Chuck wrote:
> > It's my understanding that the router config is 'created' by the router
> > parsing all the data structures for interfaces, protocols etc.  Sounds
> > like a bug has caused it to stop seeing all these things, even though
> ...
> > what's missing.  Is this router low on memory, possibly affecting the
> > real-time creation of the config?  On the other hand, I'd be reluctant
> I regularly see this on AS5200's due to memory starvation/fragmentation.
> If you write mem once this has begun, odds are you will lose portions of
> the config.  Assuming the 7206 in question has been modified many times
> and done many write mem's, I'd be very afraid of config loss when it does
> eventually reboot.  Hopefully you can piece together what should be there
> from rancid, show int, and perhaps your telco ordering records.


Thanks for the input.  I'm pretty convinced this is the problem.  I just
have one more dumb yet important question.  Getting the config is not too
hard, but I want to verify this one process...

If I tftp my good config to "flash:startup-config" and then reload the
router, is it going to try and update that with it's own bogus idea of the
config as it reloads?



> It may be that if you shut the ATM interface with all the customers on it
> or shut off whatever routing protocols are in use, that might free up
> enough / large enough blocks of RAM to get one final proper write mem out
> of it before doing a reload.  That's probably what I'd try...but I'd still
> be prepared to start from scratch in case it didn't work.
> ----------------------------------------------------------------------
>  Jon Lewis                   |  I route
>  Senior Network Engineer     |  therefore you are
>  Atlantic Net                |
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