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Re: Deborah Brungard's Discuss on draft-ietf-rtgwg-backoff-algo-07: (with DISCUSS)

"Acee Lindem (acee)" <acee@cisco.com> Thu, 22 February 2018 00:52 UTC

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From: "Acee Lindem (acee)" <acee@cisco.com>
To: Deborah Brungard <db3546@att.com>, The IESG <iesg@ietf.org>
CC: "draft-ietf-rtgwg-backoff-algo@ietf.org" <draft-ietf-rtgwg-backoff-algo@ietf.org>, Uma Chunduri <uma.chunduri@huawei.com>, "rtgwg-chairs@ietf.org" <rtgwg-chairs@ietf.org>, "rtgwg@ietf.org" <rtgwg@ietf.org>
Subject: Re: Deborah Brungard's Discuss on draft-ietf-rtgwg-backoff-algo-07: (with DISCUSS)
Thread-Topic: Deborah Brungard's Discuss on draft-ietf-rtgwg-backoff-algo-07: (with DISCUSS)
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Date: Thu, 22 Feb 2018 00:52:32 +0000
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Hi Deborah, 

Given that the goal of RFC 6976 was much more ambitious and the mechanisms are much more complex, I don't think this draft should be put in the same category. 

What we have done is precisely specify a standard algorithm for IGP SPF back-off. When deployed, this standard algorithm will greatly improve (but not eliminate) micro-loops in IGP routing domains currently utilizing disparate SPF back-off algorithms. The problem statement draft best articulates the impact of differing SPF back-off algorithms: https://www.ietf.org/id/draft-ietf-rtgwg-spf-uloop-pb-statement-06.txt. Finally, there have been several prototype implementations validating the algorithm specification's completeness and clarity. 

Thanks,
Acee

    Deborah Brungard has entered the following ballot position for
    draft-ietf-rtgwg-backoff-algo-07: Discuss
    
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    ----------------------------------------------------------------------
    DISCUSS:
    ----------------------------------------------------------------------
    
    While I agree with Alvaro's concerns, my concern is the appropriateness of this document as PS.
    This document should have a similar status as RFC6976 (Informational) which also provided a
    mechanism that prevented transient loops saying "the mechanisms described in this
    document are purely illustrative of the general approach and do not constitute a protocol
    specification". Especially as this document compares itself to RFC6976, saying RFC6976 is a
    "full solution".
    
    With a change of status to Informational, this document would be better
    scoped as providing guidance vs. a specification.

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