North American Network Operators Group Date Prev | Date Next | Date Index | Thread Index | Author Index | Historical Re: router startup behavior
On Mon, Jan 14, 2002 at 10:53:48AM -0800, Ratul Mahajan wrote: > > > at university of washington, we are doing a measurement study of bgp > misconfiguration > (http://www.cs.washington.edu/homes/ratul/bgp/index.html). > > one of the things we found is that there are a lot of announcements of > more-specifics that come and go within a matter of 2-5 minutes. > > by talking to the operators involved in these incidents, we found that > most of these are caused when the router is rebooted (intentionally or > not). while some operators were aware of this side effect, most were not, > and were taken by surprise that they just injected anywhere from 1-1000 > routes into BGP only to withdraw them a couple of minutes later. > > i would like to understand this behavior better. is this behavior > vendor-specific (cisco?) or pervasive? is there a configuration style that > causes or avoids this "spill-over"? It appears that routes are leaking out past a route-map based community based on a route that you e-mailed me about (as267 /30) that went to route-views. > my understanding is limited to this happens when the bgp session comes up > too soon, before the filters have taken effect. could someone familiar > with router internals shed some light on it? > > the problem is limited to route origination only, or also propagation? > in other words, can a router propagate a route it should not while > starting up because export filters are not yet in place? > > never ever gotten my hands dirty into router configuration; your input > would be invaluable. - jared -- Jared Mauch | pgp key available via finger from [email protected] clue++; | http://puck.nether.net/~jared/ My statements are only mine.
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