Re: [ipfix-eval] Some comments on the evaluation team draft

[Vamsidhar Valluri <[e-mail]>]

On 14 Nov 2002, Simon Leinen wrote:

> On Thu, 14 Nov 2002 16:52:35 +0100, Benoit Claise <[e-mail]> said:
> > 4.5 Time Synchronization  (5.5) LFAP: T     CRANE: T     IPDR: T
> > NetFlow: P     Diameter: T
>
> > In my draft
> > http://www.ietf.org/internet-drafts/draft-claise-ipfix-eval-netflow-03.txt,
> > I wrote
>
> >     3.4.5 Time Synchronization (5.5)
>
> >     _ Total Compliance. _
> >     The export packet header contains the UTC time of the export packet
> >     generation. This header also contains the router sysUpTime at the
> >     time of the export packet generation. The UTC time the router booted
> >     can therefore be deduced. The flow records contain the flow start
> >     and flow end sysUpTime, so that the NetFlow collector can deduce the
> >     flow start and flow end UTC time.
>
> Yes, but the problem is (Mark Fullmer pointed this out) that the UTC
> time field in the header only has 1-second resolution, so a collector
> cannot convert flow timestamps to UTC times with the required
> precision (centiseconds or better).
>
> It could be fixed by making the UTC time field in the header more
> precise.  I think earlier versions of NetFlow had this.

We are considering the suggestion made by Mark Fullmer to change this to
more precise value.

-vamsi

> --
> Simon.
>
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