Brian, For BGP-4 updates, Geoff does provide the peak numbers observed for prefix updates in 1 second intervals. http://bgpupdates.potaroo.net/instability/bgpupd.html For example: Peak Prefix Update Rate per second: 1539 while Average Prefix Updates per second: 2.76 I suspect the peak perhaps corresponds to BGP session reset events when updates are generated back-to-back. If you exclude those reset events, then BGP-4 chattiness will have low variance. Since we do not have operational BGPSEC yet, we cannot obtain similar measurements at present. But I am confident that if you focus on BGPSEC chattiness only due to beaconing (i.e., exclude BGP session resets events), then the burstiness (of BGPSEC beacons alone) will be low. Bear in mind that the protocol recommends beacons should be jittered in time, and when thousands of prefixes are beaconed in a time-jittered fashion from distributed sites, they smooth out and the resulting beacon arrival process at a router would be a rather smooth Poisson process (variance/mean = 1). So the peak # beacons in n-second intervals (for n>=1) will likely be a small multiple of the mean # beacons in n-second intervals. Again mind you, on the otherhand, if BGPSEC session resets occur, then that would be quite different -- thousands of BGPSEC updates (not beacons) would be sent back-to-back in that case between the two affected peers. It may be noted that operators are anyway used to allowing 10s of seconds for table convergence after session resets. (You will see an analysis of convergence following BGPSEC session reset in the presentation that Randy and I have in the SIDR WG meeting tomorrow.)
Sriram ________________________________________ >From: Brian Dickson [brian.peter.dick...@gmail.com] > >Hi, Sriram, > >Could you supply similar kinds of numbers, but with "peak" instead of >"average", esp. 50%ile, 75%ile, and 95%-ile levels for "peak"? > >Average is much less important than peak, in my experience. >Steady-state is easy. > >Also, in noisy/spiky data, mean != median typically. BGP is noisy/spiky. > >(Also when doing percentiles, it is essential to say, "95%ile on >5-minute samples, over a period of 1 week" for instance - and those >would be the customary sample windows to use.) > >Thanks, >Brian _______________________________________________ sidr mailing list sidr@ietf.org https://www.ietf.org/mailman/listinfo/sidr
