Peter Haag <> wrote on Monday, June 16, 2008 3:02 PM:
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> Hi Cisco gurus,
> For the next developing steps for my nfdump tools, I would like to
> implement sampling - a feature, which a lot of users would like to
> have. Sampling for v5 is announced in the v5 header and therefore
> easy to recognize. For v9, the tags 34 and 35 (SAMPLING_INTERVAL and
> SAMPLING_ALGORITHM ) are defined in the specs, but it seams as the
> IOS does not export sampling information using these tags. Googling
> lots of CISCO papers does not reveal more information on this issue.
> So can anybody shed some light on the question how IOS announces
> sampling in v9? Which platform/IOS combination do work or are
> required to get sampling information in the netflow records?
I think we only export the v9 fields related to sampling information
when using Flexible Netflow and enabling "option sampler-table". Within
the "traditional" Netflow infrastructure, these fields are not sent IIRC
(many customers use the same sampling interval throughout the network,
so entering this information statically somewhere works for many
deployments)..
oli
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