[3252] in North American Network Operators' Group
Re: Withdrawls and announcements attempt 2
daemon@ATHENA.MIT.EDU (Avi Freedman)
Fri Jun 21 12:53:58 1996
From: Avi Freedman <freedman@netaxs.com>
To: labovit@merit.edu
Date: Fri, 21 Jun 1996 12:47:27 -0400 (EDT)
Cc: nanog@merit.edu
In-Reply-To: <199606211605.MAA17672@merit.edu> from "Craig Labovitz" at Jun 21, 96 12:04:59 pm
> 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
