representativeness of flow data based on samples

Jennifer Rexford jrex at
Thu Jan 31 18:26:47 UTC 2002

> There are a few vendors who now provide traffic export from high-speed 
> interfaces by sampling those interfaces at a particular rate, and
> using the sampled packets to populate the per-flow counters, rather
> than looking at every packet.

Folks might be interested in the Internet Draft on "A framework for
passive packet measurement" that focuses on packet sampling.  See

There's a public mailing list at

  listname : psamp at
  subscribe: psamp-request at (with "subscribe" as the message)
  archive  :

The goal is to define a minimal set of requirements that need to be
supported in routers (or line cards) to meet the needs of folks that
operate networks.  Feedback more than welcome!

-- Jen

More information about the NANOG mailing list