[c-nsp] New feature, can't find it documented - NTP using DNS

[Gert Doering]

Hi,

On Tue, Nov 24, 2009 at 09:49:37PM -0600, Justin Shore wrote:
> At boot the 'ntp source' command is stripped out every time.  During the 
> boot sequence right before the "Press RETURN to get started" line this 
> error is printed:
> 
> ntp source Loopback0
>                    ^
> % Invalid input detected at '^' marker.
> 
> Note how it points specifically to the number in the interface name. 

Well, "Loopback" is fine, but there is no Loopback *0* yet.  So it makes
sense to complain about the 0...

(Well, there is no Loopback at all, at this point, but the parser might
not be *that* smart).

[..]
> I've run out of routers to test this on that can run 12.4(24)T2.  I 
> might be able to try it on a 7201 and 7206 later this week but I fully 
> expect the same results.  It's a parser bug that needs to be squashed, 
> though it may not manifest again if the DEs don't ever arbitrarily move 
> the NTP config around in the running-config.  I'm convinced that it's 
> the cause or certainly part of the problem.

I don't think it's a parser bug - it's a confgen bug.  The NTP config
being stored before the interface config will inevitably result in exactly
the problem you have seen: you can't reference "lo0" because it does not
exist yet.

(Stupid enough that such things are done carelessly, but I can't see ANY
justification for doing this in between T sub-releases.  T1->T2 should
only ever get bug fixes, not gratious code changes "just because we can").

gert
-- 
USENET is *not* the non-clickable part of WWW!
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Gert Doering - Munich, Germany                             gert at greenie.muc.de
fax: +49-89-35655025                        gert at net.informatik.tu-muenchen.de
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