On Jan 10, 2013, at 9:35 AM, Christopher Morrow wrote: > I don't think roland was really saying that normal netflow from a device in > production pushing a few hundred gbps of traffic would be > appropriate to ship out the OOB network... or I hope that wasn't his point. I > don't think oob networks need to be sized for that.
Actually, that is what I'm saying - and with sampled flow telemetry, this isn't a huge bps issue. With flow telemetry, we're typically looking at 0.5% - 1.5% of the aggregate utilized bandwidth of the exporting device, multiplied by the sampling ratio (e.g., .01, .0001, whatever) - so, they isn't a huge amount of traffic, even for very high-speed network. Modern networks should be designed with OOB/DCN which are sufficiently sized to handle flow telemetry. Exporting it in-band means that one is blind during network partition events, when visibility is key. ----------------------------------------------------------------------- Roland Dobbins <rdobb...@arbor.net> // <http://www.arbornetworks.com> Luck is the residue of opportunity and design. -- John Milton
