Re: [nsp] Back to basics? BGP /27 advertisement

From: William Sommers (sommers@sfo.com)
Date: Fri Mar 30 2001 - 14:10:47 EST


At 08:39 PM 3/28/01 -0500, Tony Tauber wrote:

> Add "no auto-summary" to the bgp process and
> it'll probably do the trick. It turns off
> antiquated summarizatoin along "classful" boundaries.
> No clue why it's still the default.
> Should've been axed like five or six years ago.

And this was indeed the answer. My sincere thanks to all who responded,
most especially Tony here and <aaronw@distracted.org> (who provided the
same privately).

In a sense then, yes, it was my suspicion of a "trick to advertising a
prefix gt 24" -- the, ahem, "trick" being telling IOS "yes, dammit, do what
I've already told you to do". It does seem ridiculous that this remains
default behavior even in an image less than 30 days old, 12.0(16), somewhat
older major train or not, all the moreso when compounded by BGP processes
not inheriting attributes from the already-specified 'ip classless'.

Having never previously attempted to announce anything longer than /24, nor
worked in space other than "C" (the true prefix is in "B"), I'd never run
into this type of thing. Learn something old... :-)

  -wfs



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