Re: [Idr] [GROW] operator inputs -- route leak solution

Gert Doering <gert@space.net> Thu, 23 March 2017 07:46 UTC

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Date: Thu, 23 Mar 2017 08:45:57 +0100
From: Gert Doering <gert@space.net>
To: Nick Hilliard <nick@foobar.org>
Cc: Gert Doering <gert@space.net>, "idr@ietf.org" <idr@ietf.org>, "grow@ietf.org" <grow@ietf.org>
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Subject: Re: [Idr] [GROW] operator inputs -- route leak solution
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Hi,

On Thu, Mar 23, 2017 at 12:08:39AM +0200, Nick Hilliard wrote:
> Gert Doering wrote:
> > If ISPs do not turn this *on* on their customer connections, it will not
> > do anything - and given that those ISPs that *need* to turn this on are
> > the ones that are not caring today, I'm still not seeing why they would
> > turn this on tomorrow.
> 
> the asns unlikely to turn on a feature like this are leaf customers,
> which is intentional.

In a topology "Upstream1<->customer<->Upstream2" the filtering, aka 
the "turning on of the new feature" needs to happen at both upstreams -
both need to send the new attribute downstream, and filter prefixes 
coming in from their customer with the new attribute.

If either upstream doesn't turn this on on their session to "cutomer", 
the mechanism will not work (and you can't make it default, as it
would break upstream/peering sessions).

Please explain to me how this is going to work if "lazy upstream ISP" 
keeps being lazy, and does nothing.

Gert Doering
        -- NetMaster
-- 
have you enabled IPv6 on something today...?

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