BCP38 - Internet Death Penalty

Fri Mar 29 13:13:35 UTC 2013

On Fri, Mar 29, 2013 at 8:36 AM, Adam Vitkovsky <adam.vitkovsky at swan.sk> wrote:
>> If the best route you pick for the customer's advertisement goes to your
> upstream instead of your customer, you won't advertise it to your peer.
>> And if your customer sets a BGP community defined to mean "don't advertise
> to peers" then you won't advertise it to the peer.
>> Yet they may well transmit packets to you for which delivery to that peer
> is directed by your routing table.
>
> Yes asymmetric routing would kill the update-based urpf unless there would
> be an informational urpf NRLI we could use for these purposes

Hi Adam,

If we go down that path, let's not overload BGP. A distinct source
address advisory protocol could have highly desirable auto-aggregation
and update rate characteristics versus BGP.

Regards,
Bill Herrin

-- 
William D. Herrin ................ herrin at dirtside.com  bill at herrin.us
3005 Crane Dr. ...................... Web: <http://bill.herrin.us/>
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