North American Network Operators Group Date Prev | Date Next | Date Index | Thread Index | Author Index | Historical Re: Withdrawls and announcements attempt 2
> A quick clarification -- the liberal BGP widthraw policy implemented by Cisco > (and a few other vendors) only accounts for a small fraction of the ~5 million > plus daily withdraws in the default-free Internet. The real source of all > these spurious withdraws remains a bit of a mystery. Our data shows some > strange sort of 30 second looping/oscilation behavior is taking place. > Possible causes of this behavior include configuration errors, unexpected > IGP-EGP interactions, vendor implementation bugs, and problems inherent with > the BGP protocol itself. > > The source of the millions of BGP withdraws is NOT Cisco's "liberal BGP > withdraw" policy -- this generates a fairly minor number of extra withdraws > (O(n) per router), and there are a quite a few valid and compelling reasons > for wanting implementing BGP this way. > > - Craig What %age of the route assertions and withdrawls are substantially the same set of routes each day? Avi - - - - - - - - - - - - - - - - -
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