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Re: [Lsr] Éric Vyncke's Discuss on draft-ietf-ospf-ospfv2-hbit-11: (with DISCUSS and COMMENT)

"Eric Vyncke (evyncke)" <evyncke@cisco.com> Mon, 02 December 2019 20:30 UTC

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From: "Eric Vyncke (evyncke)" <evyncke@cisco.com>
To: Alvaro Retana <aretana.ietf@gmail.com>, Éric Vyncke via Datatracker <noreply@ietf.org>, The IESG <iesg@ietf.org>
CC: "lsr-chairs@ietf.org" <lsr-chairs@ietf.org>, Yingzhen Qu <yingzhen.ietf@gmail.com>, "draft-ietf-ospf-ospfv2-hbit@ietf.org" <draft-ietf-ospf-ospfv2-hbit@ietf.org>, "lsr@ietf.org" <lsr@ietf.org>
Thread-Topic: Éric Vyncke's Discuss on draft-ietf-ospf-ospfv2-hbit-11: (with DISCUSS and COMMENT)
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Date: Mon, 02 Dec 2019 20:30:51 +0000
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Subject: Re: [Lsr] Éric Vyncke's Discuss on draft-ietf-ospf-ospfv2-hbit-11: (with DISCUSS and COMMENT)
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Alvaro

I do not mind too much the transient inconsistencies but more about longer term inconsistencies (1) hence my question about simulations / tests in the absence of mathematical proof.

The R-bit has always been in OSPFv3 (AFAIK), so, OSPFv3 does not have the same issue.

-éric

(1) having some routers being H-bit aware and other routers not processing the H-bit could probably introduce long term inconsistencies and loops.

On 02/12/2019, 17:59, "iesg on behalf of Alvaro Retana" <iesg-bounces@ietf.org on behalf of aretana.ietf@gmail.com> wrote:

    On November 30, 2019 at 11:21:01 AM, Éric Vyncke wrote:
    
    Eric:
    
    Hi!
    
    > == DISCUSS ==
    >
    > -- Section 5 --
    > The risk of having inconsistent view of the topology with H-bit aware and
    > unaware routers seems possible to me (albeit perhaps only transient). Has
    > this feature been tested / simulated in large scale networks?
    
    Yes, as with other operations in a network (reconvergence, for
    example), there is a risk of transient inconsistency.  §5 already
    makes recommendations to mitigate transient states.  What explicitly
    are you looking for to address your DISCUSS?
    
    I'll let the authors reply about tests/simulations.
    
    Thanks!
    
    Alvaro.

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