Level 3 BGP Advertisements

Paul Vinciguerra pvinci at VinciConsulting.com
Wed Aug 29 15:08:52 CDT 2012


-----Original Message-----
From: Blake Dunlap [mailto:ikiris at gmail.com] 
Sent: Wednesday, August 29, 2012 4:00 PM
To: nick at flhsi.com
Cc: nanog at nanog.org
Subject: Re: Level 3 BGP Advertisements

On Wed, Aug 29, 2012 at 2:56 PM, Nick Olsen <nick at flhsi.com> wrote:

> I hear you guys, It's done that way for a bit of traffic steering.
>
> If I could get away with just the aggregates I would, Trust me.
>
> Nick Olsen
> Network Operations (855) FLSPEED  x106
>
> ----------------------------------------
>  From: "Berry Mobley" <berry at gadsdenst.org>
> Sent: Wednesday, August 29, 2012 3:45 PM
> To: nanog at nanog.org
> Subject: Re: Level 3 BGP Advertisements
>
> [...]
>
> >Please, unless you really know why you need to do otherwise, just 
> >originate your aggregates.
>
> +1
>
>

That should be unnessecary, the local prefs should already be winning as a customer vs transit/peer for equal prefix length.

As an aside, generally inbound traffic steering as a reason for disaggregation is fairly frowned upon by the community at large as it effectively makes everyone else pay more in additional hardware cost for your savings.


-Blake


If you have provided addressing from your aggregate to your customer and they have indicated that they are multi-homing, you need to preserve their prefix-length in your outbound advertisements, or the redundant provider carries the inbound traffic.  Is this also frowned on?  To me, this is the multihoming tax we all pay for.

Paul





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