I can not believe that it will be 2X. First case: A beacon will very rarely cause a different bestpath.
Second case: There is actually a changed route being updated. You will receive both a regular update and a signature. Only one of those will casue a new bestpath in the great majority of cases. Basically, in the large majority of cases, a signature does not change the bestpath. -- Jakob Heitz. > -----Original Message----- > From: George, Wes [mailto:[email protected]] > Sent: Monday, November 14, 2011 5:37 PM > To: Jakob Heitz; Randy Bush > Cc: Sriram, Kotikalapudi; sidr wg list > Subject: RE: [sidr] Burstiness of BGP updates (was: WGLC: draft- > ietf-sidr-bgpsec-reqs) > > > From: [email protected] [mailto:[email protected]] On > Behalf > > Of Jakob Heitz > > > > The difference is that today's updates all have the same urgency. > > BGPSEC is not urgent. It doesn't matter if you don't receive a > > signature for a few minutes. > > An UNREACH is not signed. > > [WEG] I don't totally agree with this characterization. If the > BGPSec info triggers a recalculation of bestpath from what was > chosen when the unsigned update came through, this has the potential > to drive 2x the work, essentially take 2x longer for convergence, > plus push another round of updates to downstream neighbors, another > reprogram of the FIB, etc. Seems to me by the time we've gained any > benefit of saving updates for later because the box is busy, we've > triggered a far worse potential death spiral on a busy box. > Processing a few additional updates is rather pale in comparison to > having to consistently recalculate a non-trivial percentage of the > table when the box gets "busy." > Similar to buffering and QoS, you can't get something for nothing > here, and there are limits to where deferred processing can help to > smooth out peaks vs. simply throwing more capacity at the problem, > especially in the land of often underutilized multi-core systems. > > Wes George > > This E-mail and any of its attachments may contain Time Warner Cable > proprietary information, which is privileged, confidential, or > subject to copyright belonging to Time Warner Cable. This E-mail is > intended solely for the use of the individual or entity to which it > is addressed. If you are not the intended recipient of this E-mail, > you are hereby notified that any dissemination, distribution, > copying, or action taken in relation to the contents of and > attachments to this E-mail is strictly prohibited and may be > unlawful. If you have received this E-mail in error, please notify > the sender immediately and permanently delete the original and any > copy of this E-mail and any printout. _______________________________________________ sidr mailing list [email protected] https://www.ietf.org/mailman/listinfo/sidr
