[quagga-users 7363] Re: quagga, ospfd negative ages

Paul Jakma paul at clubi.ie
Tue Aug 1 15:39:54 IST 2006


On Tue, 1 Aug 2006, Chris Gates wrote:

> change the system time,
> vtysh: show ip ospf database self-originate
>
> i get negative ages, ie:

> 10.20.20.172    10.20.20.172    -1388 0x80000012

> Dont know if its fixed in the newer versions, What this does is 
> stop other ospf peers from accepting the lsa,

Yes, it would cause all sorts of problems. Various things in Quagga, 
from libzebra timers to LSA ages in ospfd, all base their notion of 
how much time has passed on gettimeofday.

You can not wildly vary that time and expect things to work. Going 
backwards, in particular, is guaranteed to break things.

> Im using ntpd, when the server first boots ntpd is started after 
> ospfd, ive now changed the order to fix the issue above.

Right, fix the time at early boot. Leave it alone thereafter.

See also:

http://www.quagga.net/docs/docs-info.php#ip-ospf-authentication-message_002ddigest

regards,
-- 
Paul Jakma	paul at clubi.ie	paul at jakma.org	Key ID: 64A2FF6A
Fortune:
Nothing astonishes men so much as common sense and plain dealing.
 		-- Ralph Waldo Emerson


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