On 12/2/15, 11:45 AM, "Ben Pfaff" <b...@ovn.org> wrote:
>On Tue, Dec 01, 2015 at 06:43:49PM -0800, Wenyu Zhang wrote: >> The patch is to skip BFD packets in ipfix. >> Bidirectional Forwarding Detection (BFD) packets are for monitoring >> the tunnel link status and consumed by ovs itself, no need to sample >> them. >> Refer to IETF RFC 5881, BFD control packets are the UDP packets with >> destination port 3784 and BFD echo packets are the UDP packets with dst >> destination port 3785. >> Ipfix will skip both BFD control packets and BFD echo packets. >> >> Signed-off-by: Wenyu Zhang <wen...@vmware.com> > >Does this reduce the accuracy of the estimate of the total number of >packets? If so, can that be fixed? I think that it won¹t affect the accuracy. Because the total number of packets is per-flow, when the BFD packets are skipped, The BFD flow will not exported, but the packets number of other flows won¹t be affected. E.g: the sampling rate is 10%, and there are 100 packets coming, including 20 BFD packets and 80 packets for other flows. According sampling action, there may be about 10 packets sampled in datapath, 2 BFD packets and 8 other packets. And then in user world ipfix, the 2 BFD packets will be skipped, and we will estimate of the total number of packets in Other flow via 8*10=80, it is same as before. Bests, Wenyu _______________________________________________ dev mailing list dev@openvswitch.org http://openvswitch.org/mailman/listinfo/dev
