[c-nsp] BGP peer/customer routes

[Gert Doering]

Hi,

On Tue, May 31, 2011 at 03:17:11PM +0200, Vitkovsky, Adam wrote:
> I believe the new customer questionnaire should query customers as to who they use as transit 
> -and if one of the customer upstream ISPs happens to be your peer 
>  than you should not advertise prefixes of the particular customer to that peer
> -and also update your peer inbound filter with your customer prefixes/ASNs

Bad advice.  What happens if one of the customer uplink fails?  Then you
*need* the interconnection to ensure they still have reachability to that
AS.

Now, filtering out more-specifics coming in from your peer but not
announced by the customer to you (thus redirecting incoming transit
traffic out the peering link) might make sense.

gert
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Gert Doering - Munich, Germany                             gert at greenie.muc.de
fax: +49-89-35655025                        gert at net.informatik.tu-muenchen.de
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