Re: [sidr] [Idr] AS_SET depreciation (RFC6472) and BGP multipath

Robert Raszuk <robert@raszuk.net> Wed, 28 March 2012 16:29 UTC

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Date: Wed, 28 Mar 2012 18:29:45 +0200
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Cc: "idr@ietf.org List" <idr@ietf.org>, Paul Jakma <paul@jakma.org>, sidr wg list <sidr@ietf.org>
Subject: Re: [sidr] [Idr] AS_SET depreciation (RFC6472) and BGP multipath
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Chris,

> it seems that to date, folk can't seem to figure out the aggregation
> bits, maybe that will change in the future.

Let me point out that IBGP multipath is used very commonly today. When 
you do that you need to advertise something meaningful out to your 
neighbors. Yes that is open IDR topic no one seems to be actively 
working on. However let's not block any work on it just because SIDR can 
not handle some solutions.

Are we going to freeze any AS_PATH modifications by operator's policy 
too ? I mentioned replace-as which all major vendors support. There can 
be more knobs like this coming in the future.

CDNI is just getting extended to BGP (new SAFI) and they have their own 
uses for AS_PATH being sort of over the top of classic ASes.

Regards,
R.