[40850] in North American Network Operators' Group
Re: Routescience?
daemon@ATHENA.MIT.EDU (Peter Francis)
Thu Aug 23 13:53:34 2001
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In-Reply-To: <3B85256A.966283FF@routescience.com>
Date: Thu, 23 Aug 2001 10:52:53 -0700
To: Sean Finn <seanf@routescience.com>
From: Peter Francis <peter@softaware.com>
Cc: nanog@merit.edu
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Errors-To: owner-nanog-outgoing@merit.edu
>Christoper,
>
> no, the PathControl device does *not* adjust outgoing
>advertisements in any way; all prefixes that we repeat
>carry the NO_EXPORT attribute.
And if the ISP using your box has downstream BGP customers in different ASes?
The NO_EXPORT tag really serves no purpose here because any ISP that would be avertising your bozxes routes to its upstreams already has a much bigger problem.
The NO_EXPORT tag just makes it more complicated to get the "better paths" to the ISPs BGP customers.
Adding unnecessary locks just to make something sound "safe" is usually a surefire way cause a disaster when a slightly-clued person clears the tag to get the routes to downstreams and suddenly discovers they are announcing your boxes routes to the world.
Do you guys have a white paper on all this?
Peter
>
>cheers -- Sean
>
>
>"Christopher A. Woodfield" wrote:
>>
>> Can/will the box adjust inbound route selection via the use of prepending
>> and/or provider communities?
>>
>> -C
>>
>> > Once more, we do not cause the stub AS's own advertisement of themselves
>> > to change. We specifically avoid touching locally originated prefixes.
>> > If the ISP is currently accepting any of the routes PathControl is
>> > designed to change, then the AS is not stub, it's transit. Hopefully
>> > this clarifies an important issue.
>> >
>> > (Referring back to Paul Vixie's point, we have found that careful
>> > optimization of a single outbound step has very substantial payoffs in
>> > terms of the end to end, bidirectional performance. The figures quoted
>> > on our web page and in the press release refer to this: end to end
>> > application speedup caused solely by outbound route selection!)
>> >
>> > Mike
>>
>> --
>> ---------------------------
>> Christopher A. Woodfield rekoil@semihuman.com
>>
>> PGP Public Key: http://pgp.mit.edu:11371/pks/lookup?op=get&search=0xB887618B
