Re: [Idr] IETF LC for IDR-ish document <draft-ietf-grow-bgp-reject-05.txt> (Default EBGP Route Propagation Behavior Without Policies) to Proposed Standard

<bruno.decraene@orange.com> Fri, 21 April 2017 07:32 UTC

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From: <bruno.decraene@orange.com>
To: John Scudder <jgs@juniper.net>, "idr@ietf.org" <idr@ietf.org>
CC: Hares Susan <shares@ndzh.com>, Enke Chen <enkechen@cisco.com>
Thread-Topic: [Idr] IETF LC for IDR-ish document <draft-ietf-grow-bgp-reject-05.txt> (Default EBGP Route Propagation Behavior Without Policies) to Proposed Standard
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Date: Fri, 21 Apr 2017 07:32:29 +0000
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Subject: Re: [Idr] IETF LC for IDR-ish document <draft-ietf-grow-bgp-reject-05.txt> (Default EBGP Route Propagation Behavior Without Policies) to Proposed Standard
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> From: John Scudder  Sent: Thursday, April 20, 2017 11:13 PM
> 
 > (as an individual contributor)
 > 
 > On Apr 20, 2017, at 5:03 PM, Enke Chen <enkechen@cisco.com>; wrote:
 > > It's not like the issues with software update are new :-)
 > 
 > Yes, exactly. That's why I'm so surprised by this discussion.
 > 
 > What I still see here is
 > 
 > - on one hand, a worked example showing how an implementor could roll out the
 > functionality without causing heartburn for users. (My paraphrase: expose the default in
 > the configuration. When upgrading old->new, automatically create the corresponding
 > configuration line(s) to configure for legacy behavior.)
 > 
 > - on the other hand, general statements about how this is a hard problem.
 > 
 > I find the specific worked example more convincing.

Good point. Thanks for the useful contribution to the debate.

a) Regarding this specific point, could the draft refer to this point. e.g. add this requirement (if this is a requirement draft, which it looks like it when reading the first sentence of section 2) or add the solution (space) (if the draft define a solution).
e.g. "When the BGP speaker is upgraded to those new default behavior, existing BGP sessions, configured using the old default, must be unaffected".
Or whatever text.

That is indeed the most significant deployment impact, so it's good that it can be addressed/included, rather than silently ignored.

b) Still, this draft introduce new deployment impact to all network operators using EBGP, including the ones not concerned with this problem space, as provisioning tools need to be updated prior to this deployment, otherwise provisioning would fails. Plus silently fails as the session is kept up, silently ignoring the route with no feedback to the EBGP peer). Plus for each plateform, they need to selectively handle both configurations depending on the software version of this plateform.

Regards,
--Bruno 

 > --John
 > _______________________________________________
 > Idr mailing list
 > Idr@ietf.org
 > https://www.ietf.org/mailman/listinfo/idr

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