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

"John G. Scudder" <jgs@juniper.net> Thu, 20 April 2017 18:31 UTC

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From: "John G. Scudder" <jgs@juniper.net>
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Date: Thu, 20 Apr 2017 14:31:29 -0400
CC: Jared Mauch <jared@puck.Nether.net>, "idr@ietf.org" <idr@ietf.org>
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To: "Alvaro Retana (aretana)" <aretana@cisco.com>
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Archived-At: <https://mailarchive.ietf.org/arch/msg/idr/hhZ37kgfJykv9ubcNx4Z-4vq4LU>
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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I agree that the document represents an update to RFC 4271, for the reasons you give.

I don't see any advantage to be gained by going back to square one as you talk about in your later paragraphs. If the goal of the authors is to say what what a BGP implementation MUST do (and as far as I can tell, it is) then it seems to me that this is the right vehicle. Furthermore, as of now I don't see any reason to despair of coming to consensus. Probably we should let the LC play out and then see where we've landed, don't you think? Maybe we will have (rough) consensus to advance the document; in that case, done. Maybe we will not; in that case we have to decide what to do next.

--John

> On Apr 20, 2017, at 1:50 PM, Alvaro Retana (aretana) <aretana@cisco.com>; wrote:
> 
> Jared:
> 
> Hi!
> 
> Not everyone in this thread was part of the initial conversations we had, so to give a little background:  I think (yes, still) that the document (as is in -05) should be marked as updating rfc4271 because it starts off saying that it “defines the default behavior of a BGP speaker…” and later (Section 2) describes specific changes pointing at pieces of rfc4271: “…MUST consider any routes advertised by an EBGP peer ineligible for route selection (section 9.1.1 [RFC4271])…”.
> 
> Again, what gives me heartburn and the reason this document caught my attention is that change in the default – and from this thread, I can see that is an issue for others.
> 
> 
> Reading what you wrote below, about other potential options to achieve the same result, I agree with you that the bar doesn’t have to be as high as changing the default in rfc4271.  But the current document doesn’t reflect that.
> 
> Maybe what we need is to describe the solution in a way that is not so rfc4271-specific.  Explain what the behavior should be (not how to achieve it), and even talk about the operational pain, and what operators should consider with the current not-specified behavior (which the document doesn’t do much of now).  I think that would be a very different document with a different set of discussion points, but one that could lead to the goal.
> 
> During the early thread of this draft (a couple of years ago), several people suggested that the status should be a BCP.  I can see how a document explaining the pains and the considerations for Internet routers could be a BCP.
> 
> Just trying to move the conversation forward.
> 
> Alvaro.
...