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Re: Dampening considered harmful? (Was: Re: verizon.net and other email grief)
On Fri, Dec 17, 2004 at 12:42:21AM +0100, Iljitsch van Beijnum wrote: > > On 17-dec-04, at 0:21, Jerry Pasker wrote: > > >> ie: does dampening cause more problems than it tries to solve/avoid > >>these days. > > >I don't know what takes more router resources; dampening enabled > >doing the dampening calculations, or no dampening and constantly > >churning the BGP table. I would assume dampening generally saves > >router resources, or operators wouldn't chose to enable it. > > One reason to be careful with dampening is that flaps can be > multiplied. (Connect to routeviews and see the different flap counts > under different peers for the same flap at your end to observe this.) There have been numerous people who have spoken and released research on this topic. I think with the "better" routing code out there these days, that most people can quickly handle a large number of next-hop changes, etc.. in their hw/sw that disabling dampening would allow the networks to reconverge fairly quickly without (much) trouble. (going to respond to the streaming video/audio/whatnot issue seperately). - jared -- Jared Mauch | pgp key available via finger from [email protected] clue++; | http://puck.nether.net/~jared/ My statements are only mine.