Re: [Idr] Vendor Defaults (was Re: Review of draft-ietf-large-community-06.txt)

heasley <heas@shrubbery.net> Mon, 07 November 2016 17:38 UTC

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Date: Mon, 7 Nov 2016 17:38:11 +0000
From: heasley <heas@shrubbery.net>
To: Gert Doering <gert@space.net>
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Cc: heasley <heas@shrubbery.net>, "idr@ietf.org" <idr@ietf.org>, Robert Raszuk <robert@raszuk.net>
Subject: Re: [Idr] Vendor Defaults (was Re: Review of draft-ietf-large-community-06.txt)
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Mon, Nov 07, 2016 at 01:14:59PM +0100, Gert Doering:
> Hi,
> 
> On Sun, Nov 06, 2016 at 04:08:49AM +0000, heasley wrote:
> > If you consider draft-grow-bgp-reject, does that change your opinion about
> > filtering needing to be the default?
> 
> IOS XR is doing exactly that.  What is your point?

XR is Jakob's attention, but IOS{-XE} and others do not.  but, the point is
that if, by implementing that draft (or by having already implemented that
draft in the case of XR), the implementation is not leaking communities (or
any NLRI) and requires RPL to do so.

Since the suggested argument for existance of this 'send-communities' knob
was to require configuration to send-communities - it is redundant, policy
is already required to send (or rx) any NLRI.

Not sending communities by default is a problem for leaf networks (eg CLECs,
regional telephone companies) that are behind ISPs who do not understand
routing well.  I do not see a disadvantage (or sum of) that is greater than
this advantatge.