[afnog] CPU and memory usage -- Netflow

Mike Barnard mike.barnardq at gmail.com
Thu Mar 29 14:32:53 UTC 2007

Thanks Mark, this quite does it....if i need more info, ill get back here.
thanks again

> We are running Netflow on an NPE-G1 with full memory, seeing an
> average 2% CPU utilization (peaking at 3%). After 2 full BGP feeds
> and what-not, free operating memory sits at about 705MB.
> This includes Netflow running on 3 interface, but then again this
> router is only handling about 10-13Mbps worth of traffic.
> > especially for routers in an IXP.
> We ran Netflow once on a heavily-configured 3640 doing about 12Mbps.
> CPU utilization didn't look great, but we swapped this router out
> for a 7200-VXR. The 3640 is now doing some exchange point work, but
> haven't enabled Netflow on it yet; that said, expect little or no
> comparably technical difference when deploying Netflow, say,
> against your upstream interfaces.
> > And in general, where best on the network would one collect
> > netflow data?
> We monitor interfaces at the edge of the network, i.e., where PoP's
> enter into the core, where customers enter into the edge network,
> where upstream providers enter into the border routers.
> These would be typical, but you may have requirements that would
> necessitate you running Netflow in another part of the network, or
> even for your customers.
> > and what version of netflow would one consider for
> > any given situation?
> We export version 5 data, which gives us mostly what we need at the
> moment (including ASN's).
> Hope this helps.
> Mark.

Of course, you might discount this possibility, but remember that one in
a million chances happen 99% of the time.

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