nanog mailing list archives
Re: Real world sflow vs netflow?
From: Joe Loiacono <jloiacon () csc com>
Date: Fri, 13 Jul 2012 21:30:37 -0400
Peter Phaal <peter.phaal () gmail com> wrote on 07/13/2012 04:20:45 PM:
2. sFlow: Packets are randomly sampled in hardware and the packet headers are immediately exported as sFlow datagrams - there is no flow cache on the switch/router. In addition to exporting the packet header, the sFlow agent captures the FIB state associated with forwarding the sampled packet, exporting information such as next hop router, AS-path, communities etc
What about byte counts? Just those in the sampled packet (i.e., no running totals per flow)?
In contrast, the sFlow standard specifies how sampling must be performed and ensures that information is included that allows the sampled data to be correctly scaled and produce unbiased measurements.
Does sflow software typically recreate the total byte count per flow (e.g., TCP session) by scaling? Thanks, Joe
Current thread:
- Real world sflow vs netflow? David Hubbard (Jul 13)
- Re: Real world sflow vs netflow? Jeroen Massar (Jul 13)
- Re: Real world sflow vs netflow? Harry Hoffman (Jul 13)
- Re: Real world sflow vs netflow? Peter Phaal (Jul 13)
- Re: Real world sflow vs netflow? Joe Loiacono (Jul 13)
- Re: Real world sflow vs netflow? Łukasz Bromirski (Jul 14)
- Re: Real world sflow vs netflow? Mikael Abrahamsson (Jul 14)
- Re: Real world sflow vs netflow? Łukasz Bromirski (Jul 14)
- Re: Real world sflow vs netflow? Paolo Lucente (Jul 15)
- Re: Real world sflow vs netflow? Nick Hilliard (Jul 15)
- RE: Real world sflow vs netflow? James Braunegg (Jul 16)
- RE: Real world sflow vs netflow? David Hubbard (Jul 16)
- RE: Real world sflow vs netflow? James Braunegg (Jul 16)
- Re: Real world sflow vs netflow? Simon Leinen (Jul 17)
- Re: Real world sflow vs netflow? Nick Hilliard (Jul 17)