From nobody Sun Nov 3 17:01:45 2019 Return-Path: X-Original-To: rift@ietfa.amsl.com Delivered-To: rift@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 4A1B21200EB; Sun, 3 Nov 2019 17:01:43 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.997 X-Spam-Level: X-Spam-Status: No, score=-1.997 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id Gib5HUXgJouf; Sun, 3 Nov 2019 17:01:38 -0800 (PST) Received: from mail-io1-xd33.google.com (mail-io1-xd33.google.com [IPv6:2607:f8b0:4864:20::d33]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id C2621120072; Sun, 3 Nov 2019 17:01:37 -0800 (PST) Received: by mail-io1-xd33.google.com with SMTP id s3so12764330ioe.3; Sun, 03 Nov 2019 17:01:37 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=CTlYCVgriVJji9QjR22JjSx4N5IoHhernQAQP//w648=; b=KcaUnhr108nDJ/TiZvjQAA37OoIjfiCtrbcRqF8E868+3PrpaVmmld2/Ldn9x/xGJU ndBxpSPD740Xi8jl+c3J1hrOsvupQJ42ZkRKbW8lo6hUwcN14TpaIrOO/dQZmQ9XJgbq 7ZZgtH9L6m9oOd/Mhm24W5zsVIA/zBCg9CMuU/ebUZXZUrh+CwyKZPjUKmYtfx1qqzrS khGV2EOo51RfPycv0FNYCQz+B/+6tHjWXyFOzfiQi8NQ5IpXVEk3s2TzH8OcxUzoKFJ5 14UNMGo65cUk1nVR1yH32Y1gjOw79ZpPfWdDJTHPffxH1i+GKC6mReLpxPE7J7r05Rm4 4XcA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=CTlYCVgriVJji9QjR22JjSx4N5IoHhernQAQP//w648=; b=EQHxGhRhWGzKKx5GNAtxQGvs4ikpxWLgs+EOgyc5sVJ0tSL5RmBU1UHkacVG59VNW8 i02GmlbSkBvq7Dm6MRm+cbUvhBgLvdCTVI5OtURQQoEyW1njex/4jJukipyVAROiRNui 1AKGGDqeTthaud70AgdzDi4FYgtbYn+tH9lcVmT1nQQGz1Eic6lZBxeh0wnLWj1RbWu8 1BE7YGoapgoYzTInVpfAazhlGrqf2qUDkAqtfwouHqauoXdTBBc/Uhg5TaSyqEkKHqFp LyeXoTseEATzZvfJNRsbmPPPHM3y30KsaIKxQSLmHOX6fB1QGIvWKqFHKlXRYgZ7boGN VRXg== X-Gm-Message-State: APjAAAV3fHWnlkFTpAyDlVAsxbIPE1rbQNuGubSDG+6QmOTnAW8PYqQe PYoIEhAym+ts1Zz9obsuolNJYP3XgvQ1SIr0qL8= X-Google-Smtp-Source: APXvYqw/ZN/5oPwzCzYzXURP2BnFSl7xeRtQ76K5E5a6GfO/jbYyz24KXPGUQw/Gzhj/WqZZn8EzO6GAWcNlWYo0aok= X-Received: by 2002:a6b:b54a:: with SMTP id e71mr21447039iof.132.1572829296541; Sun, 03 Nov 2019 17:01:36 -0800 (PST) MIME-Version: 1.0 References: In-Reply-To: From: Tony Przygienda Date: Sun, 3 Nov 2019 17:00:43 -0800 Message-ID: To: Jonathan Hardwick Cc: "rift-wg-chairs@ietf.org" , "draft-ietf-rift-rift.all@ietf.org" , "rtg-dir@ietf.org" , =?UTF-8?Q?Luc_Andr=C3=A9_Burdet?= , Min Ye , "rift@ietf.org" Content-Type: multipart/alternative; boundary="00000000000083468b05967adb47" Archived-At: Subject: Re: [Rift] Routing directorate early review of draft-ietf-rift-rift X-BeenThere: rift@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Discussion of Routing in Fat Trees List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 04 Nov 2019 01:01:43 -0000 --00000000000083468b05967adb47 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Jonathan, thanks for your review, responses inline On Thu, Oct 31, 2019 at 11:01 AM Jonathan Hardwick wrote: > Hello > > > > I have been selected to do a Routing Directorate =E2=80=9Cearly review=E2= =80=9D of this > draft: > > https://datatracker.ietf.org/doc/draft-ietf-rift-rift/ > > > > The routing directorate will, on request from the working group chair, > perform an =E2=80=9Cearly=E2=80=9D review of a draft before it is submitt= ed for publication > to the IESG. The early review can be performed at any time during the > draft=E2=80=99s lifetime as a working group document. The purpose of the = early > review depends on the stage that the document has reached. As this > document has advanced to working group last call, my focus for the review > was to determine whether the document is ready to be published. Please > consider my comments along with the other working group last call comment= s. > > > > For more information about the Routing Directorate, please see > http://trac.tools.ietf.org/area/rtg/trac/wiki/RtgDir > > > > Document: draft-ietf-rift-rift > > Reviewer: Jon Hardwick > > Review Date: 31 Oct 2019 > > Intended Status: Standards Track > > > > *Summary* > > Thanks for writing this document. It is a very interesting approach and = I > really enjoyed getting to grips with the ideas presented in the draft! > thanks, quite a lot of work > Unfortunately, I have some concerns about the document and think it needs > more work before being submitted to the IESG. The problem is that I foun= d > the document hard to read, for several reasons. > > - It is very light in its use of normative RFC-2119 style language. > An implementer would have to fill in quite a few gaps and/or make > assumptions about various passages. > > I will address in specifics the sections you raised inline. Otherwise, in meta terms, as to the question of "is this specification being precise enough?" I can quote only what I wrote to Robert Sparks already: *"we have two interoperable implementations since a bit, one completely open source which has been produced based on the spec. It was in fact open source work that helped to refine the document content to make sure we can have an implementation produced based on the text without further "guessing things". As example the LIE FSM has been implemented initially in open source without consulting authors of the spec and interoperat'ed without a single defect (but discovered a protocol underspecification in case of misconfiguration that was subsequently added). Please refer to IETF proceedings for the according presentations if necessary. We have a third implemenation progressing now where all questions the implementor asked so far could be answered by pointing directly @ the specification as written. This seems to answer to me the "suspicion of specification maybe not being good enough to implement" as an objective measuring stick as far I can imagine one. * *"* We are in IETF here where "rough consenus and running code" was the receipe of success vs. much heavier handed organizations like OSI and I think in this philosophy the spec, if anything, is possibly overspecified already ;-) The core pieces that bare no slips like flooding and adjacency formation are very precisely written including FSMs. > > - > - The definition of the protocol and some of the normative behaviour > is deferred to the appendices, whereas I would expect to encounter it = early > on in the text, with an in-line discussion of the purposes of the mess= ages > and fields. > > Ok, seems like the second directorate reviewers prefers the appendices to be pulled into the document. Let me do that thenl > > - > - It sometimes refers to concepts or terms that are either not defined > or have not yet been introduced to the reader, suggesting an ordering = issue > within the text. > > > > I think that the document needs to be refactored somewhat to solve the > ordering issues, use more normative language, eliminate any text that is > not actually relevant to the implementation and deployment of the protoco= l, > and pull together the normative definition of the protocol into a > contiguous block early on in the document. > further inline > > > The other issue is that, because the document is large and I found it > rather hard going, I did not have time do a thorough review beyond sectio= n > 5.3. I=E2=80=99d therefore have to recommend another directorate review = once we > have concluded on the issues I=E2=80=99m raising below. > ok, obviously as much is written as we expect is necessary to "clearly" spec out the protocol. The document is more than simply a dry prescriptive normative though since very early in the workgroup sessions the input of many people was that they would prefer is some more "narrative" explanation of "what" and "why" is inserted instead of purely the algorithms. We tried to find a balance but obviously opinions will always vary between "this is too chatty and should be just a dry normative" and "this does not explain WHY that would work and WHY it has been designed that way". Based on Robert Sparks review I will try to simplify the language and cut out some superfluous text he pointed out or I find. We'll see where we end. > > > *Details* > > Here are comments on the sections that I was able to review in detail > before I ran out of time. > > > > Abstract > > Is it possible to reformat this as a list of items on multiple lines? It > would read more clearly. > yes > > > Section 2 > > "an optimal approach does not seem however": this appears to be a value > judgment rather than consensus opinion, appearing as it does without > citation, and may be perceived as treading on the toes of other > standardization efforts currently in progress at the IETF. I suggest you > simply state the facts: "RIFT approaches this problem using a mixture of.= .." > done, sure. > > > Section 2.1 > > The form of words in the Requirements Language boilerplate has changed > recently - see RFC 8174. > thanks, corrected > > > Section 3.1 > > ZTP - expand acronym on first use. > yes, ZTP added. glossary will be rea-arranged based on other reviewers input. > There is potential for confusion between N-TIE and Node TIE! I'd prefer > "North TIE" for the former. > > An example of confusion: is the "South Node TIE" referred to in the > definition of "South Reflection" the same as the S-TIE referred to in the > definition of "TIE"? > > "The document sometimes calls them flood leaders as well." But it would b= e > better if you just used one term. > OK, I expand N- and S- to North- and South- everywhere in the document > > > Section 4 > > Personally I could live without this section > > Merge PEND1 with NONREQx (or explain the distinction) > thanks, there were multiple discussions pro/cons on mike/list about this section and suggestions along the lines to split it out into a different document (but standardizing requirement drafts went out of fashion recently ;-) or drop it. I'm dropping it based on your input and others desiring to shorten the document. > > > Section 5.1.3 - 5.1.5 > > This discussion is not possible to follow properly until you have been > introduced to positive & negative disaggregation and southern reflection. > As such I wonder if it really belongs in a section called "overview". > Jonathan, well, section 5.1.3 "fallen leaf" (4 now given requirements is removed) _is_ the overview section. Southern reflection is defined in the glossary already and the "negative disaggregation" is a mechanism introduced to address the "fallen leaf problem" later and obviously the problem itself has to be explained & introduced first. Negative disaggregation is arguably (beside flooding scopes) the most complex part of the spec and we spent lots of time and effort (especially Pascal) with multiple rewrites to give the narrative describing the CLOS inherent problem. Moreover we didn't want to mix it up with RIFT specific mechanism since the "fallen leaf": problem exists in multi-plane CLOS independent of any protocol and BTW, I never saw it explained as clearly as Pascal did in the multi-plane introduction section. Also, we clearly state in the section that if someone builds a single plane CLOS the section can be disregarded to simplify the reading of the spec for many people. > > > Section 5.2.2 > > > > A node configured with "undefined" PoD membership MUST, after > > building first northbound three way adjacencies to a node being in a > > defined PoD, advertise that PoD as part of its LIEs. In case that > > adjacency is lost, from all available northbound three way > > adjacencies the node with the highest System ID and defined PoD is > > chosen. > > > > It seems odd that the choice of advertised pod is at first > non-deterministic (race to the first adjacency) and then, only if this > initial adjacency is lost, the choice of pod becomes deterministic. Why n= ot > make it deterministic the whole time? > The first adjacency is simply used to speed up things since otherwise how long do you wait until you have all northbound adjacencies? Observe that level ZTP will possibly drop adjacencies while it's converging so the consequent set will refine the PoD as well, i.e. the ZTP is guaranteed to get the node to the maximum available level @ which point in time the northbound available adjacencies will determine the PoD. Obviouly the adjacencies can disagree about the PoD and such a scenario can be used by an implementation to report miscablings. We talk quickly about miscabling detection in the spec since it's such a desirable property _of an implementaiton_ but it's not necessary for correct protocol operation so we don't make anything normative except disallowing adjacency forming across PoDs if defined. Since configurting and converging PoDs is optional we allow even to disregard this rule on adjacency formation. > > > Section 5.2.3.2 > > > > In the example TIEs, "Spine21" should be "ToF 21" to agree with the > nomenclature of figure 2. Ditto in table 4 (section 5.2.3.4) > > In Spine 111's Node-S-TIE, I am not sure that the links(...) should be > given for each neighbor. > corrected the ToF 21/22 everywhere. Yes, on careful reading one wonders WHY node south tie should include _all_ links. This is necessary for both flood reduction as well as bandwidth balancing since both happen from south going up and the node computing needs the northbound neighbors of the level up. That's one of the reasons the example is givne. I'll add a clarifying sentence. > > > Section 5.2.3.5 > > "It should only set it in the southbound direction." - SHOULD? > corrected > > Section 5.2.3.8 > > Define N-SPF on first use > OK, N-SPF and S-SPF added to glossary. > > > Section 5.2.4 > > "A node has three sources" - I see only two listed. > > "We use simple, familiar SPF algorithms here..." - is the use of those > algorithms supposed to be normative? Or are you just giving an example an= d > leaving me to choose my own algorithm? If SPF is normative then you need > to specify it using normative language or include a normative reference t= o > it. > I tried to clarify that better in the existing text by expanding to A node has three possible sources of relevant information for reachability computation. A node knows the full topology south of it from the received North Node TIEs or alternately north of it from the South Node TIEs. A node has the set of prefixes with their associated distances and bandwidths from corresponding prefix TIEs. To compute prefix reachability, a node runs conceptually a northbound and a southbound SPF. We call that N-SPF and S-SPF denoting the direction in which the comput= ation front is progressing. Since neither computation can "loop", it is possible to compute non-equal-cost or even k-shortest paths and "saturate" the fabric to the extent desired but we use simple, familiar SPF algorithms and concepts here as example due to their prevalence in today's routing. So the algorithms given are NOT normative but I improved what _is_ normative in the N-SPF and S-SPF section
N-SPF *MUST use ONLY* northbound and East-West adjacencies in the computing node's node North TIEs (since if the node is a leaf it may not have generated a node South TIE) when starting SPF. ... Once progressing, we are using the next higher level's node South TIEs t= o find according adjacencies to verify backlink connectivity. Just as in case of IS-IS or OSPF, two unidirectional links* MUST* be associated together to confirm bidirectional connectivity. ...
*S-SPF MUST use ONLY* the southbound adjacencies in the node South TIEs, i.e. progresses towards nodes at lower levels. Observe that E-W adjacencies are NEVER used in the computation. This enforces th= e requirement that a packet traversing in a southbound direction must never change its direction. *S-SPF MUST* use northbound adjacencies in node North TIEs to verify backlink connectivity by checking for presence of the link beside correct SystemID and level. This is about all that needs to be said here in terms of normative language beside the one already present. > Section 5.2.4.1 > > Please define the terms "south prefix" and "north prefix" > > "Supersuming" is not a word I recognise. Use "or a non-default prefix > which contains this south prefix" > > "the node does not..." -> "the computing node does not..." > > > > Section 5.2.4.2 > > "S-SPF uses northbound adjacencies in node N-TIEs to verify backlink > connectivity" - this statement needs to be recast into normative language > using RFC 2119 terms. "A node MUST verify backlink connectivity ... Else > it MUST NOT include the link.... Etc." > > Same comment applies in many places throughout the document. > re-read and applied more normative language to the specific section as indicated above. Re-read the document and normalized more languagte where necessary. > > > Section 5.2.4.3 > > What is a `"ring protection" scheme`? > Ring based protection scheme just like BLSR. I replace with "ring-based protection" which is fairly well understood term in networking. Removed the ring based protection of a level to applicability draft which multiple authors work on and where it seems to belong rather than in the spec. Left only clarification Using south prefixes over horizontal links MAY occur if the N-SPF is East-West adjacencies in computation. It can protect against pathological fabric partitioning cases that leave only paths to destinations that would necessitate multiple changes of forwarding direction between north and south. > Are E-W links permitted between planes? > > Not sure what this is telling me: "Using south prefixes over horizontal > links is optional..." - is that OPTIONAL as in RFC 2119? Do you mean tha= t > my implementation can ignore them? Or not advertise them? Or that the > network operator does not have to cable them? > Clarified as per section above. If the N-SPF is using horizontal adjacencies it will pick up those prefixes. > > > Section 5.2.4.4 > > "Even though a ToF node could > > be tempted to use those links during southbound SPF this MUST NOT be > > attempted since it may lead in, e.g. anycast cases to routing loops." > > > > This is too verbose and obtuse. I cannot see how anycast cases lead to > routing loops and I don't know if I need to understand why or not. Sugge= st > > > "A ToF node MUST NOT include east-west links in its south-SPF calculation= ." > This is already said in the S-SPF section very explicitly as S-SPF *MUST use ONLY the southbound adjacencies in the node South TIEs, i.e. progresses towards nodes at lower levels. Observe that E-W adjacencies are NEVER used in the computation. This enforces the requirement that a packet traversing in a southbound direction must never change its direction.* > > This section gives the impression that E-W links at the ToF will never be > used for forwarding data - is that true? They are used for control plane > only? > Yes, it is described in text but I clarified the section on horizontal links in ToF further E-W ToF links behave in terms of flooding scopes defined in like northbound links and *MUST be used for control plane information flooding ONLY*. Even though a ToF node could be tempted to use those links during southbound SPF and carry traffic over them th= is MUST NOT be attempted since it may lead in, e.g. anycast cases to routing loops. An implemention MAY try to resolve the looping problem by following on the ring strictly tie-broken shortest-paths only but the details are outside this specification. And even then, the problem of proper capacity provisioning of such links when they become traffic-bearing in case of failures is vexing. > > > "An implementation could try ... but the details are outside this > specification" - so why mention it? > Because of the fact that the question was coming up multiple times in meetings/mails and so on. Instead of negative disaggregation people were tempted to "forward through the horizontal links on top" when a fallen leaf starts forwarding in the wrong plane (i.e. the one where it's fallen). This section points out that this should not be attempted due to looping problems, i.e. a ToF node that has no reachability to an anycast address (since a fallen leaf forwarded to an anycast destination that is also fallen) could try to use horizontal links to forward traffic but it may have multiple planes that can reach the destination. Obviously when it forwards e.g. left on the ring & the traffic arrives on the ToF that seems to be able to reach that anycast the ToF may choose to forward it back on the ring to "another ToF" that can reach the anycast. Observer that RIFT is loop-free i.e. one can forward on any path as long it reaches the destination but since horizontal is considered equivalent to northbound forwarding and metric can be disregarded (RIFT is not bound by shortest path) the traffic may just end up looping in the ring. This is hard to describe and would to lots figures hence the spec simply says "don't do it" and if one is tempted to one will find out why it's a bad idea when one implemented this. And then the said implementer will probably try to fix it by the "shortest path" computation @ ToF level which is next layer of the onion the document mentions and then explains again that this may work but he stop going out there with this spec. The "ring" between planes necessary is visualized in figure 13 and described in section 4.2.5.2.1. Cabling of Multiple Top-of-Fabric Planes again in an example. I don't think that needs further clarification. > > > Section 5.2.5.1 > > "A DAG computation" - expand DAG. > already expanded in entrance to terminology section but added a more specific definition > > > "Neither > > is it necessary for the receiving node to reflect the > > disaggregated prefixes back over its adjacencies to nodes at the > > level from which it was received." > > > > Please restate this using RFC 2119 language. > done. It's actually not necessary for this language here to be normative since the normative part is Table 3 and when it is implemented all the algorithm behavior and resulting flooding follows straight out of that. I emphasized that the flooding scopes table is normative. > > > How can we guarantee that a same-level node does not have a next hop to a > given prefix that is unknown to the node doing the computation? If X > reaches P via N1 and N2, Y (at the same level as X) can reach P via N3 bu= t > X does not know this and assumes Y cannot reach P because Y is not adjace= nt > to N1 and N2, then X unnecessarily disaggregates P positively. For > instance if X's link to N3 has failed and Y's links to N1 and N2 have > failed. > that cannot be guaranteed. If X can reach prefix via N1 which Y doesn't have and Y via N3 that X doesn't have but they only see via a nexthops N0 (though which the prefix cannot be reached) then both will disaggregate since anything else would be assuming necessity of "harmonica routing" which RIFT doesn't do since harmonica is opposite to valley free routing which RIFT does to guarantee loop free behavior. That is actually a good example why RIFT positive disaggregation guarantees sufficient disaggregation to prevent blackholes, loops and bow-ties but possibly more than necessary (which is never claimed in the document). > > > "Each entry is a list of south neighbor of X and a list of nodes > > of X.level that can't reach that neighbor" > > > > Think this should say > > > > "Each entry in the set is a south neighbor of X and a list of nodes > > of X.level that can't reach that neighbor" > yes, thanks. > > > "X does not to disaggregate any prefixes" -> ""X does not disaggregate an= y > prefixes."" > yes > > > "The PoD containing the prefix will prefer southbound anyway." - I didn't > understand the point. Is it necessary for me to understand it? Please > expand or delete the sentence if it's not necessary. > clarified: all the lower level nodes are flooded the same disaggregated prefixes since we don't want to build an South TIE per node and complicate things unnecessarily. The lower level node that can compute a southbound route to the prefix will prefer it to the disaggregated route anyway based on route preference rules. > > > Section 5.2.6 > > "such as mobility per section 5.3.3 necessary" - delete "necessary". > yes > "ties are broken based upon type first and then distance and further > attributes" - I don't see mention of further attributes in the proposed > algorithm. > corrected to PrefixAttributes which are contained in the schema. Mobility tie-breaking is described in its own section. The document does not standardize further tie-breaking since .e.g. tie-breaking on tags is possible but can be completely implementation dependent given RIFT is loop-free. Neither do I think any kind of "standardizable agreement" could be possible here. > > "The nexthop > > adjacencies for a negative prefix are inherited from the longest > > prefix that aggregates it" - suggest changing to "longest positive > prefix" > ok > > > "all entries of the father" -> "all entries of the parent" > ok > Section 5.2.7.3 > > "we have to decide whether node Y is at the same level as I, J or at > > the same level as Y and consequently, X is south of it." > > > > I could not parse this. I think you might mean this: > > > > "we have to decide whether node Y is at the same level as I, J > > (and consequently X is south of it) or at the same level as X." > yes, correct, somewhat it got garbled, corrected to First, we must anchor the "top" of the cabling and that's what the TOP_OF_FABRIC flag at node A is for. Then things look smooth until we have to decide whether node Y is at the same level as I, J (and as consequence, X is south of it) or at the same level as X. This is unresolvable here until we "nail down the bottom" of the topology. To achieve that we choose to use in this example the leaf flags in X and Y. In case where Y would not have a lea= f flag it will try to elect highest level offered and end up being in same level as I and J. > > > Section 5.2.7.4 > > How does a ToF node know what value to advertise in its LEVEL_VALUE? > This constant is provided in appendix D.1 I'm working on the other directorate reviews and will try to cut a new version with all those changes before deadline --00000000000083468b05967adb47 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Jonathan, thanks for your review, responses inline

On Thu, Oct 31, 2019 at 11:01 AM Jonathan Hardwick <Jonathan.Hardwick= =3D40m= etaswitch.com@dmarc.ietf.org> wrote:

Hello

=C2=A0

I have been selected to do a Ro= uting Directorate =E2=80=9Cearly review=E2=80=9D of this draft:

https://datatracker.i= etf.org/doc/draft-ietf-rift-rift/

=C2=A0

The routing directorate will, o= n request from the working group chair, perform an =E2=80=9Cearly=E2=80=9D = review of a draft before it is submitted for publication to the IESG. The e= arly review can be performed at any time during the draft=E2=80=99s lifetime as a working group document. The purpose of the e= arly review depends on the stage that the document has reached.=C2=A0 As th= is document has advanced to working group last call, my focus for the revie= w was to determine whether the document is ready to be published. Please consider my comments along with the other working = group last call comments.

=C2=A0

For more information about the = Routing Directorate, please see http://trac.tools.ietf.org/area/rtg= /trac/wiki/RtgDir

=C2=A0

Document: draft-ietf-rift-rift<= u>

Reviewer: Jon Hardwick

Review Date: 31 Oct 2019=

Intended Status: Standards Trac= k

=C2=A0

Summary=

Thanks for writing this documen= t.=C2=A0 It is a very interesting approach and I really enjoyed getting to = grips with the ideas presented in the draft!


thanks, quite a lot of work
=C2=A0
<= div>

Unfortunately, I have some conc= erns about the document and think it needs more work before being submitted= to the IESG.=C2=A0 The problem is that I found the document hard to read, = for several reasons.

  • It is very light in its = use of normative RFC-2119 style language.=C2=A0 An implementer would have t= o fill in quite a few gaps and/or make assumptions about various passages.<= /span>
I will address in specifics t= he sections you raised inline.

Otherwise, in = meta terms, as to the question of "is this specification being precise= enough?" I can quote only what I wrote to Robert Sparks already:

"we have two interoperable implementations sin= ce a bit, one completely=20 open source which has been produced based on the spec. It was in fact=20 open source work that helped to refine the document content to make sure we can have an implementation produced based on the text without=20 further "guessing things". As example the LIE FSM has been implem= ented=20 initially in open source without consulting authors of the spec and=20 interoperat'ed without a single defect (but discovered a protocol=20 underspecification in case of misconfiguration that was subsequently=20 added). Please refer to IETF proceedings for the according presentations if necessary. We have a third implemenation progressing now where all=20 questions the implementor asked so far could be answered by pointing=20 directly @=C2=A0 the specification as written. This seems to answer to me t= he "suspicion of specification maybe not being good enough to implement&= quot;=20 as an objective measuring stick as far I can imagine one.
"

We are in IETF here where "= ;rough consenus and running code" was the receipe of success vs. much = heavier handed organizations like OSI and I think in this philosophy the sp= ec, if anything, is possibly overspecified already ;-) The core pieces that= bare no slips like flooding and adjacency formation are very precisely wri= tten including FSMs.
=C2=A0
  • The def= inition of the protocol and some of the normative behaviour is deferred to = the appendices, whereas I would expect to encounter it early on in the text= , with an in-line discussion of the purposes of the messages and fields.

Ok, seems like the sec= ond directorate reviewers prefers the appendices to be pulled into the docu= ment. Let me do that thenl
=C2=A0
  • =
  • I= t sometimes refers to concepts or terms that are either not defined or have= not yet been introduced to the reader, suggesting an ordering issue within= the text.

=C2=A0

I think that the document needs= to be refactored somewhat to solve the ordering issues, use more normative= language, eliminate any text that is not actually relevant to the implemen= tation and deployment of the protocol, and pull together the normative definition of the protocol into a contiguo= us block early on in the document.

=
further inline
=C2=A0

=C2=A0

The other issue is that, becaus= e the document is large and I found it rather hard going, I did not have ti= me do a thorough review beyond section 5.3.=C2=A0 I=E2=80=99d therefore hav= e to recommend another directorate review once we have concluded on the issues I=E2=80=99m raising below.


ok, obviously as much is written as we= expect is necessary to "clearly" spec out the protocol. The docu= ment is more than simply a dry prescriptive normative though since very ear= ly in the workgroup sessions the input of many people was that they would p= refer is some more "narrative" explanation of "what" an= d "why" is inserted instead of purely the algorithms. We tried to= find a balance but obviously opinions will always vary between "this = is too chatty and should be just a dry normative" and "this does = not explain WHY that would work and WHY it has been designed that way"= . Based on Robert Sparks review I will try to simplify the language and cut= out some superfluous text he pointed out or I find. We'll see where we= end.
=C2=A0

=C2=A0

Details=

Here are comments on the sectio= ns that I was able to review in detail before I ran out of time.<= /u>

=C2=A0

Abstract

Is it possible to reformat this= as a list of items on multiple lines? It would read more clearly.


yes
=C2=A0

=C2=A0

Section 2<= /p>

"an optimal approach does = not seem however": this appears to be a value judgment rather than con= sensus opinion, appearing as it does without citation, and may be perceived= as treading on the toes of other standardization efforts currently in progress at the IETF. I suggest you simply state the = facts: "RIFT approaches this problem using a mixture of..."


done, sure.
=C2=A0

<= /span>

=C2=A0

Section 2.1

The form of words in the Requir= ements Language boilerplate has changed recently - see RFC 8174.

=

thanks, corrected
=C2=A0

<= /span>

=C2=A0

Section 3.1

ZTP - expand acronym on first u= se.


yes, ZTP added. = glossary will be rea-arranged based on other reviewers input.
=C2=A0

<= /span>

There is potential for confusio= n between N-TIE and Node TIE! I'd prefer "North TIE" for the = former.

An example of confusion: is the= "South Node TIE" referred to in the definition of "South Re= flection" the same as the S-TIE referred to in the definition of "= ;TIE"?

"The document sometimes ca= lls them flood leaders as well." But it would be better if you just us= ed one term.


OK, I e= xpand N- and S- to North- and South- everywhere in the document
<= div>=C2=A0

<= /span>

=C2=A0

Section 4<= /p>

Personally I could live without= this section

Merge PEND1 with NONREQx (or ex= plain the distinction)


thanks, there were multiple discussions pro/cons on mike/list about this= section and suggestions along the lines to split it out into a different d= ocument (but standardizing requirement drafts went out of fashion recently = ;-) or drop it. I'm dropping it based on your input and others desiring= to shorten the document.
=C2=A0

=

=C2=A0

Section 5.1.3 - 5.1.5=

This discussion is not possible= to follow properly until you have been introduced to positive & negati= ve disaggregation and southern reflection.=C2=A0 As such I wonder if it rea= lly belongs in a section called "overview".


Jonathan, well, section 5.1.3 "falle= n leaf" (4 now given requirements is removed) _is_ the overview sectio= n. Southern reflection is defined in the glossary already and the "neg= ative disaggregation" is a mechanism introduced to address the "f= allen leaf problem" later and obviously the problem itself has to be e= xplained & introduced first. Negative disaggregation is arguably (besid= e flooding scopes) the most complex part of the spec and we spent lots of t= ime and effort (especially Pascal) with multiple rewrites to give the narra= tive describing the CLOS inherent problem. Moreover we didn't want to m= ix it up with RIFT specific mechanism since the "fallen leaf": pr= oblem exists in multi-plane CLOS independent of any protocol and BTW, I nev= er saw it explained as clearly as Pascal did in the multi-plane introductio= n section. Also, we clearly state in the section that if someone builds a s= ingle plane CLOS the section can be disregarded to simplify the reading of = the spec for many people.
=C2=A0

=C2=A0

Section 5.2.2

=C2=A0

=C2=A0=C2=A0 A node configured = with "undefined" PoD membership MUST, after<= /p>

=C2=A0=C2=A0 building first nor= thbound three way adjacencies to a node being in a

=C2=A0=C2=A0 defined PoD, adver= tise that PoD as part of its LIEs.=C2=A0 In case that<= /p>

=C2=A0=C2=A0 adjacency is lost,= from all available northbound three way

=C2=A0=C2=A0 adjacencies the no= de with the highest System ID and defined PoD is

=C2=A0=C2=A0 chosen.<= /u>

=C2=A0

It seems odd that the choice of= advertised pod is at first non-deterministic (race to the first adjacency)= and then, only if this initial adjacency is lost, the choice of pod become= s deterministic. Why not make it deterministic the whole time?


The= first adjacency is simply used to speed up things since otherwise how long= do you wait until you have all northbound adjacencies?=C2=A0 Observe that = level ZTP will possibly drop adjacencies while it's converging so the c= onsequent set will refine the PoD as well, i.e. the ZTP is guaranteed to ge= t the node to the maximum available level=C2=A0@ which point in time the no= rthbound available adjacencies will determine the PoD. Obviouly the adjacen= cies can disagree about the PoD and such a scenario can be used by an imple= mentation to report miscablings. We talk quickly about miscabling detection= in the spec since it's such a desirable property _of an implementaiton= _ but it's not necessary for correct protocol operation so we don't= make anything normative except disallowing adjacency forming across PoDs i= f defined. Since configurting and converging PoDs is optional we allow even= to disregard this rule on adjacency formation.=C2=A0
=C2=A0=

=C2=A0

Section 5.2.3.2

=C2=A0

In the example TIEs, "Spin= e21" should be "ToF 21" to agree with the nomenclature of fi= gure 2.=C2=A0 Ditto in table 4 (section 5.2.3.4)

In Spine 111's Node-S-TIE, = I am not sure that the links(...) should be given for each neighbor.=


corrected the ToF 21/22 ev= erywhere.=C2=A0 Yes, on careful reading one wonders WHY node south tie shou= ld include _all_ links. This is necessary for both flood reduction as well = as bandwidth balancing since both happen from south going up and the node c= omputing needs the northbound neighbors of the level up. That's one of = the reasons the example is givne. I'll add a clarifying sentence.
<= /div>
=C2=A0

=C2=A0

Section 5.2.3.5

"It should only set it in = the southbound direction."=C2=A0 - SHOULD?


corrected

=C2=A0

Section 5.2.3.8

Define N-SPF on first use


OK, N-SPF and S-SPF added= to glossary.
=C2=A0

=C2=A0

Section 5.2.4

"A node has three sources&= quot; - I see only two listed.

"We use simple, familiar S= PF algorithms here..." - is the use of those algorithms supposed to be= normative? Or are you just giving an example and leaving me to choose my o= wn algorithm?=C2=A0 If SPF is normative then you need to specify it using normative language or include a normative reference to= it.


I tried to clar= ify that better in the existing text by expanding to 

<t=
>A node has thr=
ee possible sources of relevant information for reachability computation.  =

    A node knows
    the full topology south of it from the received=
 North Node TIEs or alternately
    north of it from the South Node TIEs=
.  A node has the
    set of prefixes with their associated distances an=
d bandwidths from
    corresponding prefix TIEs.</t>

<t>To compute prefix reachability, a=
 node runs conceptually a northbound
    and a southbound
    SPF.    We call that N-SPF and S-SPF denoting the direction in which the compu=
tation
    front is progressing.
</t>

<t>Since neither computation can "loop"=
;, it is
    possible to compute non-equal-cost or even
    <xref =
target=3D"EPPSTEIN">k-shortest paths</xref>
    and &=
quot;saturate" the fabric
    to the extent desired but we use simp=
le, familiar SPF algorithms and
    concepts here as example due to thei=
r prevalence in today's routing.
</t>
=C2=A0
So the algorithms given are NOT= normative but I improved what _is_ normative in the N-SPF and S-SPF sectio= n 
<section anchor=3D"nspf" title=3D"Northbound SPF">

    <t> N-SPF MUST use ONLY northbound=
 and East-West adjacencies in the computing
        node's node Nort=
h TIEs (since if the node is a leaf it may not have
        generated a =
node South TIE)
        when starting SPF. ...

<t>Once progressing, we are using the next higher level=
's node South TIEs to
    find according adjacencies to verify backl=
ink connectivity.
    Just as in case of IS-IS or OSPF, two unidirection=
al links MUST be
    associated
    together to confirm bidire=
ctional connectivity. ...

<=
section anchor=3D"sspf" title=3D"Southbound SPF">

    <t=
> S-SPF MUST=
 use ONLY the
        southbound adjacencies in the node South TIEs,=

        i.e. progresses towards nodes at lower levels. Observe that
=
        E-W adjacencies are NEVER used in the computation. This enforces th=
e
        requirement that a packet traversing in a southbound direction=
 must
        never change its direction.</t>
    <t>S-SPF MUST use northbound adjacen=
cies in node North TIEs to verify backlink
        connectivity by check=
ing for presence of the link beside correct SystemID and 
        level.=
 </=
t>


This is about all that need= s to be said here in terms of normative language beside the one already pre= sent.
=C2=A0

Section 5.2.4.1

Please define the terms "s= outh prefix" and "north prefix"

"Supersuming" is not = a word I recognise.=C2=A0 Use "or a non-default prefix which contains = this south prefix"

"the node does not..."= ; -> "the computing node does not..."

=C2=A0

Section 5.2.4.2

"S-SPF uses northbound adj= acencies in node N-TIEs to verify backlink connectivity" - this statem= ent needs to be recast into normative language using RFC 2119 terms.=C2=A0 = "A node MUST verify backlink connectivity ... Else it MUST NOT include the link.... Etc."

Same comment applies in many pl= aces throughout the document.


<= /div>
re-read and applied more normative language to the specific secti= on as indicated above.=C2=A0 Re-read the document and normalized more langu= agte where necessary.
=C2=A0

=C2=A0

Section 5.2.4.3

What is a `"ring protectio= n" scheme`?


Rin= g based protection scheme just like BLSR. I replace with "ring-based p= rotection" which is fairly well understood term in networking.

Removed the ring based protection of a level to appl= icability draft which multiple authors work on and where it seems to belong= rather than in the spec. Left only clarification

<= div>
<t>Using south prefixes over horizontal links =
MAY occur
=C2=A0if the N-SPF is East-West adjacencies in computation.    It can
    protect against pathological fabric partitioning cases t=
hat
    leave only paths to destinations that would necessitate multiple=

    changes of forwarding direction between north and south.
    </t>
=C2=A0

Are E-W links permitted between= planes?

Not sure what this is telling m= e: "Using south prefixes over horizontal links is optional..." - = is that OPTIONAL as in RFC 2119?=C2=A0 Do you mean that my implementation c= an ignore them? Or not advertise them? Or that the network operator does not have to cable them?


Clarified as per section above. If the N-SPF is = using horizontal adjacencies it will pick up those prefixes.
=C2=A0

=C2=A0

Section 5.2.4.4

"Even though a ToF node co= uld

=C2=A0=C2=A0 be tempted to use = those links during southbound SPF this MUST NOT be

=C2=A0=C2=A0 attempted since it= may lead in, e.g. anycast cases to routing loops."

=C2=A0

This is too verbose and obtuse.= =C2=A0 I cannot see how anycast cases lead to routing loops and I don't= know if I need to understand why or not.=C2=A0 Suggest

=C2=A0


"A ToF node MUST NOT inclu= de east-west links in its south-SPF calculation."


This is already said in the S-SPF sectio= n very explicitly as 

<<=
span style=3D"color:rgb(0,0,128);background-color:rgb(239,239,239);font-wei=
ght:bold">t> S-SPF MUST use ONLY the
    southbound adjacencies in the node S=
outh TIEs,
    i.e. progresses towards nodes at lower levels. Observe th=
at
    E-W adjacencies are NEVER used in the computation. This enforces =
the
    requirement that a packet traversing in a southbound direction m=
ust
    never change its direction.</t

=C2=A0
<= blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-l= eft:1px solid rgb(204,204,204);padding-left:1ex">
<= p class=3D"MsoNormal">

=C2=A0

This section gives the impressi= on that E-W links at the ToF will never be used for forwarding data - is th= at true?=C2=A0 They are used for control plane only?

=

Yes, it is described in text but= I clarified the section on horizontal links in ToF further

<= /div>
<t>E-W ToF links behave in terms of floo=
ding scopes defined in
    <xref target=
=3D"tiescopes"/> like northbound links and MUST be used for control pl=
ane
    information flooding ONLY. Even though a ToF node could be t=
empted
    to use those links during southbound SPF and carry traffic ov=
er them this
    MUST NOT be attempted since it may lead in, e.g. anycas=
t cases to routing loops.
    An implemention MAY try to resolve the loo=
ping problem by following on the ring strictly
    tie-broken
    sho=
rtest-paths only but the details are outside this specification. And even t=
hen,
    the problem of proper capacity provisioning of such links when =
they become traffic-bearing in
    case of failures is vexing.</t>
=
=C2=A0

<= u>

=C2=A0

"An implementation could t= ry ... but the details are outside this specification" - so why mentio= n it?


Because of the= fact that the question was coming up multiple times in meetings/mails and = so on. Instead of negative disaggregation people were tempted to "forw= ard through the horizontal links on top" when a fallen leaf starts for= warding in the wrong plane (i.e. the one where it's fallen). This secti= on points out that this should not be attempted due to looping problems, i.= e. a ToF node that has no reachability to an anycast address (since a falle= n leaf forwarded to an anycast destination that is also fallen) could try t= o use horizontal links to forward traffic but it may have multiple planes t= hat can reach the destination. Obviously when it forwards e.g. left on the = ring & the traffic arrives on the ToF that seems to be able to reach th= at anycast the ToF may choose to forward it back on the ring to "anoth= er ToF" that can reach the anycast. Observer that RIFT is loop-free i.= e. one can forward on any path as long it reaches the destination but since= horizontal is considered equivalent to northbound forwarding and metric ca= n be disregarded (RIFT is not bound by shortest path) the traffic may just = end up looping in the ring. This is hard to describe and would to lots figu= res hence the spec simply says "don't do it" and if one is te= mpted to one will find out why it's a bad idea when one implemented thi= s. And then the said implementer will probably try to fix it by the "s= hortest path" computation=C2=A0@ ToF level which is next layer of the = onion the document mentions and then explains again that this may work but = he stop going out there with this spec.

The &= quot;ring" between planes necessary is visualized in figure 13 and des= cribed in section 

4.2.5.2.1.  Cabling of Multiple Top-of-Fabric Planes
<= div>
again in an example. I don't think that needs furthe= r clarification.
=C2=A0

=C2=A0

Section 5.2.5.1

"A DAG computation" -= expand DAG.


already= expanded in entrance to terminology section but added a more specific defi= nition
=C2=A0

=C2=A0

"Neither

=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0 is it necessary for the receiving node to reflect the<= /span>

=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0 disaggregated prefixes back over its adjacencies to nodes at the<= /u>

=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0 level from which it was received."

=C2=A0

Please restate this using RFC 2= 119 language.


done. = It's actually not necessary for this language here to be normative sinc= e the normative part is Table 3 and when it is implemented all the algorith= m behavior and resulting flooding follows straight out of that. I emphasize= d that the flooding scopes table is normative.
=C2=A0
<= blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-l= eft:1px solid rgb(204,204,204);padding-left:1ex">
<= p class=3D"MsoNormal">

=C2=A0

How can we guarantee that a sam= e-level node does not have a next hop to a given prefix that is unknown to = the node doing the computation?=C2=A0 If X reaches P via N1 and N2, Y (at t= he same level as X) can reach P via N3 but X does not know this and assumes Y cannot reach P because Y is not adjacen= t to N1 and N2, then X unnecessarily disaggregates P positively.=C2=A0 For = instance if X's link to N3 has failed and Y's links to N1 and N2 ha= ve failed.


that cann= ot be guaranteed. If X can reach prefix via N1 which Y doesn't have and= Y via N3 that X doesn't have but they only see via a nexthops N0 (thou= gh which the prefix cannot be reached) then both will disaggregate since an= ything else would be assuming necessity of "harmonica routing" wh= ich RIFT doesn't do since harmonica is opposite to valley free routing = which RIFT does to guarantee loop free behavior.=C2=A0 That is actually a g= ood example why RIFT positive disaggregation guarantees sufficient disaggre= gation to prevent blackholes, loops and bow-ties but possibly more than nec= essary (which is never claimed in the document). =C2=A0
=C2= =A0

<= /p>

=C2=A0

"Each entry is a list of s= outh neighbor of X and a list of nodes

=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0 of X.level that can't reach that neighbor"

=C2=A0

Think this should say=

=C2=A0

"Each entry in the set is = a south neighbor of X and a list of nodes

=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0 of X.level that can't reach that neighbor"

=

yes, thanks.
=C2=A0

=C2=A0

"X does not to disaggregat= e any prefixes" -> ""X does not disaggregate any prefixes= .""


yes
=C2=A0
<= div lang=3D"EN-US">

=

=C2=A0

"The PoD containing the pr= efix will prefer southbound anyway." - I didn't understand the poi= nt. Is it necessary for me to understand it? Please expand or delete the se= ntence if it's not necessary.

<= br>
clarified: 

<t>=
;all the lower level nodes are flooded the same disaggregated
   =
 prefixes since we don't want to build an South TIE per node and
   =
 complicate things unnecessarily. The lower level node 
    that can com=
pute a southbound route to the prefix
    will prefer it to the disaggre=
gated route anyway based on 
    route preference rules.</t>
=C2=A0<= /div>
=

=C2=A0

Section 5.2.6

"such as mobility per sect= ion 5.3.3 necessary" - delete "necessary".

<= /div>

yes
=C2=A0

"ties are broken based upo= n type first and then distance and further attributes" - I don't s= ee mention of further attributes in the proposed algorithm.


corrected to 
PrefixAttributes
=C2=A0
which = are contained in the schema. Mobility tie-breaking is described in its own = section.

The document does not standardize fu= rther tie-breaking since .e.g. tie-breaking on tags is possible but can be = completely implementation dependent given RIFT is loop-free. Neither do I t= hink any kind of "standardizable agreement" could be possible her= e.

=

=C2=A0

"The nexthop=

=C2=A0=C2=A0 adjacencies for a = negative prefix are inherited from the longest

=C2=A0=C2=A0 prefix that aggreg= ates it" - suggest changing to "longest positive prefix"


ok
=C2=A0=

=C2=A0

"all entries of the father= " -> "all entries of the parent"


ok
=C2=A0

Section 5.2.7.3

"we have to decide whether= node Y is at the same level as I, J or at

=C2=A0=C2=A0 the same level as = Y and consequently, X is south of it."

=C2=A0

I could not parse this.=C2=A0 I= think you might mean this:

=C2=A0

"we have to decide whether= node Y is at the same level as I, J

=C2=A0=C2=A0(and consequently X= is south of it) or at the same level as X."


yes, correct, somewhat it got garbled, correc= ted to 

<=
span style=3D"background-color:rgb(239,239,239)"><t>First, we =
must anchor the "top" of the cabling and that's what
    t=
he TOP_OF_FABRIC flag at node A is for. Then things look smooth until
  =
  we have to decide whether node Y is at the same level as I, J
    (and=
 as consequence, X is south of it) or at
    the same level as X. This i=
s
    unresolvable here until we
    "nail down the bottom"=
 of the topology. To achieve that we choose to
    use in this
    ex=
ample the leaf flags in X and Y. In case where Y would not have a leaf
 =
   flag it will try to elect highest level offered and end up being
    =
in same level as I and J.
    </t>
=C2=A0

=C2=A0

Section 5.2.7.4

How does a ToF node know what v= alue to advertise in its LEVEL_VALUE?


This constant is provided in appendix D.1
=
I'm working on the other directorate reviews and will tr= y to cut a new version with all those changes before deadline
=C2=A0
--00000000000083468b05967adb47-- From nobody Sun Nov 3 22:11:07 2019 Return-Path: X-Original-To: rift@ietfa.amsl.com Delivered-To: rift@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 2D8CD12010D; Sun, 3 Nov 2019 22:11:06 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.997 X-Spam-Level: X-Spam-Status: No, score=-1.997 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id faiexuGNB0Wm; Sun, 3 Nov 2019 22:11:02 -0800 (PST) Received: from mail-il1-x12c.google.com (mail-il1-x12c.google.com [IPv6:2607:f8b0:4864:20::12c]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id A90DC12006E; Sun, 3 Nov 2019 22:11:02 -0800 (PST) Received: by mail-il1-x12c.google.com with SMTP id d83so13754156ilk.7; Sun, 03 Nov 2019 22:11:02 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=vKge5WN2m2UvViW3HBIJAA/xrFjEjhLv1mP5kgn5ceQ=; b=vdbG0at0YO9fs5VR/2gU7JUwTjGLbBlACkmyBzFNtKGVTWUgApYe7t7z7rYdTVCrja 9Ou+2XVvDcLgiWcH+QDFXzVzcX6gXx1ESjyDM79W2rCsyKTVcWcybpUKf0le/coE8Yre 40sbOOzaihNv6BRDmYPrSpyoHQhD5+INeSLOpp+a8K+jrs5a4tvanxovhppahLwS8nxT ZzSONjNm6UiD5uYY1fBrHUMcjkmmNWsc0Efyjz1bn1deFys+ITFxEXZSHGuZnR+YCtEg bPdUAe1R1VMF+FDthxZnua0gYRQbHU0FdrF/WVd+PDnGabqDwH7YryV6hZwhLufPuhMy ZNlA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=vKge5WN2m2UvViW3HBIJAA/xrFjEjhLv1mP5kgn5ceQ=; b=PW1ftyPG3SmRy/Tghh9QvvMHsPhAYOJ/MMh7YD2L/pFmTFA2prWIlbbX8vSMNrE0o5 meg9CEulzcHTmPHEbXWgPzxFnC4gkhWnP+F7Q8JuWfAygaLG42nqKkoJdDn1HAQqX3Ip e9oivVbx1SrSy+TI5hCwhFoMdlCNUKUuap0Uh/jw+oR5RRRTuAGahUDzVYvcshQOt93B UEf0pyrXY6eSEqKViLGmTmj8k6ljxc4xBOXTHWtVP849gENXWjKlBz1vz4NRT3WYl1WO AM8+RImQ/3cyj8ZdrffZwWsNSllcnyvTWTghTJ+PGxEu9Mkt5CDcOyvPcHJ/pzdrH7I4 S2xg== X-Gm-Message-State: APjAAAUAxQRaDy/tEPIEG61smMsY8YJSAb1yZYniNE36h5ZwD9CKntUB ftKZGm0rfFNIpjF/8mMDZj0B2EPD+L5wAHTZbQE= X-Google-Smtp-Source: APXvYqzj4VytX3EH4Tx2+nBjr1fQciG8pDGg8MmKEfKZJncx698fdaF5BofTMNdfAcG7ycrhUGqZa0HF6zhRDnccEmc= X-Received: by 2002:a92:c504:: with SMTP id r4mr22981109ilg.132.1572847861913; Sun, 03 Nov 2019 22:11:01 -0800 (PST) MIME-Version: 1.0 References: <157257415137.30463.17526140657219162235@ietfa.amsl.com> In-Reply-To: <157257415137.30463.17526140657219162235@ietfa.amsl.com> From: Tony Przygienda Date: Sun, 3 Nov 2019 22:10:08 -0800 Message-ID: To: Nagendra Kumar Cc: ops-dir@ietf.org, draft-ietf-rift-rift.all@ietf.org, rift@ietf.org Content-Type: multipart/alternative; boundary="000000000000185e7905967f2ef7" Archived-At: Subject: Re: [Rift] Opsdir early review of draft-ietf-rift-rift-08 X-BeenThere: rift@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Discussion of Routing in Fat Trees List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 04 Nov 2019 06:11:06 -0000 --000000000000185e7905967f2ef7 Content-Type: text/plain; charset="UTF-8" Nagendra, thanks so much for taking the time to go through the doc inline On Thu, Oct 31, 2019 at 7:09 PM Nagendra Kumar via Datatracker < noreply@ietf.org> wrote: > Reviewer: Nagendra Kumar > Review result: Has Issues > > Hi, > > I have reviewed this document as part of the Operational directorate's > ongoing > effort to review all IETF documents being processed by the IESG. These > comments were written with the intent of improving the operational aspects > of > the IETF drafts per guidelines in RFC5706. > > Comments that are not addressed in last call may be included > in AD reviews during the IESG review. Document editors and WG chairs > should > treat these comments just like any other last call comments. > > Overall Summary: > > This draft is a standard track proposing a very new protocol and not an > extension of any existing protocol. As such, there are no backward > compatibility issues expected. Overall this is a well written document. > Some > ambiguity that needs attention are listed below. I chose "Has Issues" > primarily > to address the issue that may cause behavior inconsistency or traffic blakc > holes. More details below: > yes, multiple thorough reviews came in, I'm incorporating comments and it will need a document spin. > > --> LIE with TTL more than 1 is clearly defined to be discarded. I couldn't > find a similar clarification when TIE is received with TTL more than 1?. > If i > didn't miss it, I think it is better to be clarified for consistent > behavior. > version -09 already says The TIE exchange mechanism uses the port indicated by each node in the LIE exchange and the interface on which the adjacency has been formed as destination. It SHOULD use TTL of 1 as well and set inter-network control precedence on according packets. > > > 5.3.7. Label Binding > > A node MAY advertise on its TIEs a locally significant, downstream > assigned label for the according interface. One use of such label is > a hop-by-hop encapsulation allowing to easily distinguish forwarding > planes served by a multiplicity of RIFT instances. > > --> Read this more than a couple of times and not sure if "for the > accordingly > interface" means assigning a locally unique label for each > interface/adjacency > or just one label for the node and advertise the same label over all > adjacency. > aha, yes, not clear. good catch. per interface (downstream unsolicited). will add. additionally, it says on its TIEs but it's the LIE that has interface specific label. labels are optional in the schema so we can easily add them later in all kind of variations as well as extend node and link capabilities with according indications. > > --> Since it is mentioned that the use of this label is for HbH > encapsulation, > a node at Level n should install (or ignore) the label from node at Level > (n-1) > in its Incoming Label Mapping (ILM) table? > > > --> On the same line, a node at Level n should install (or ignore) the > label > from node at Level (n-2)?. > > --> I think some clarity is better to avoid traffic black holing due to > inconsistent behavior. > well, spec says only " One use of such label is a hop-by-hop encapsulation allowing to easily distinguish forwarding planes served by a multiplicity of RIFT instances." since there were discussions how to multi-instantiate RIFT with dataplane (since control plane is so easy. to run multiple times, even over same links). If you suggest a good wording and reference here we can add it to make the example ore specific. Observe that the use of the label is non-normative. I would expect people to write drafts adding e.g. adjacency capability something saying "binding label to ILM" and if the other side doesn't support that not advertise the label (kind of like BGP capabilities). Or they add their own optional schema element saying "ILM-label" or something. Protocol will allow that fine as long it's optional and has no default. We just bump the schema minor version up and allocate new codepoint (i.e. thrift field number). > > 5.3.8.1. Global Segment Identifiers Assignment > > Global segment identifiers are normally assumed to be provided by > some kind of a centralized "controller" instance and distributed to > other entities. This can be performed in RIFT by attaching a > controller to the Top-of-Fabric nodes at the top of the fabric where > the whole topology is always visible, assign such identifiers and > then distribute those via the KV mechanism towards all nodes so they > can perform things like probing the fabric for failures using a stack > of segments. > > --> According to RFC 8402, Global Segment is a generic term that refers to > a > segment from SR Global Block with instruction or forwarding semantic > defined at > the domain level. But it does not have a default instruction associated > with > it. I think the above should be more specific as Prefix SID or something > related to RIFT. > we removed the detailed SR support into its own draft and now you mentioned it I think that belongs there with all the other considerations, otherwise we'll drag the whole SR right back into RIFT draft which runs counter most comments that what we have is too long already. So, I'm removing the whole SR section from the main spec and punting the text to the authros of https://tools.ietf.org/html/draft-zzhang-rift-sr-01 The SR draft seems expired couple days ago, thought it was adopted actually, not sure what the status is, up to the chairs. > > Few observations below: > > Clos/Fat Tree: This document uses the terms Clos and Fat Tree > interchangeably whereas it always refers to a folded spine-and- > leaf topology with possibly multiple PoDs and one or multiple ToF > > --> ToF and PoD were not expanded in the first occurrence. ToF was > explained > later. > expanded acronym but the sequence is a circular dependency. Can't introduce ToF until I have fabric but fabric hard to describe without mentioning planes/tof/pods as well since otherwise it's not clear how those terms fold in. > > --> While Southbound representation is explained in the terminology > section, > northbound representation is not. I think it is better to define the same > for > consistency. > done > > Multiple > adjacencies can be formed to a neighbor via parallel interfaces > but such adjacencies are NOT sharing a neighbor structure. Saying > "neighbor" is thus equivalent to saying "a three way adjacency". > > yes, it's very different from OSPF here. > --> The above says "Multiple adjacencies can be formed to a neighbor.." > where > the "neighbor" here is implicitly defining the remote node and then the > sentence further continues stating "Saying "neighbor" is thus equivalent to > saying "a three way adjacency"". May be the first "neighbor" can be > changed to > "remote node"? > done, very good improvement in language. > > mobility defined in Paragraph 17 > > --> I assume that you are referring to REQ#17?. I think it is better to > refer > it as REQ#17. But I will leave that to the authors to decide. > > The solution should allow for access to link states of the > whole topology to enable efficient support for modern > control architectures like SPRING [RFC7855] or PCE > [RFC4655]. > > --> RFC 7855 is an information RFC that outlines the problem statement and > use > case. I think you should refer RFC 8402 here for the SR architecture. > Section for SR removed into the SR with rift draft. requirements section removed completely based on other reviewers' comments. > > "Future > versions of this document may describe support for such tunneling in > RIFT." > > --> Section 5.3.3.4 talks about Overlay encapsulation and leave it a bit > ambiguous with the above statement. I think, it should be removed. > Yes, Pascal's idea that we moved into the future. Sentence removed. > > already to HAT nodes with level different than the adjacent > > --> HAT was first expanded in page 66 while the abbreviation is used > in/from > Page 34. > best I could do was to clarify 8. [ i) the node is at level 0 and has no three way adjacencies already to Highest Adjacency Three-Way (HAT) nodes (defined in Section 4.2.7.1) with level different than the adjacent node OR since we moved the whole ZTP detailed terminology from main terminology section given it was overwhelming down into the ZTP section. > In Section 5.2.3.2, I hope the first node is "ToF21 S-TIEs" instead of > "Spine21 > S-TIEs"?. Similar references are throughout the example with Spine21 and > Spine22. > yes, came up in another review, all Spine 21/22 corrected to ToF 21/22 > > "scope of this document and may be covered in a separate document > about policy guided prefixes [PGP reference]." > > --> There is no PGP reference. This may need to be fixed or removed. > yes, it's a separate draft. To progress the document to standard we actually have to remove all the references to drafts so I remove the reference here. thanks --- tony --000000000000185e7905967f2ef7 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Nagendra, thanks so much for taking = the time to go through the doc

inline

On = Thu, Oct 31, 2019 at 7:09 PM Nagendra Kumar via Datatracker <noreply@ietf.org> wrote:
Reviewer: Nagendra Kumar
Review result: Has Issues

Hi,

I have reviewed this document as part of the Operational directorate's = ongoing
effort to review all IETF documents being processed by the IESG.=C2=A0 Thes= e
comments were written with the intent of improving the operational aspects = of
the IETF drafts per guidelines in RFC5706.

Comments that are not addressed in last call may be included
in AD reviews during the IESG review.=C2=A0 Document editors and WG chairs = should
treat these comments just like any other last call comments.

Overall Summary:

This draft is a standard track proposing a very new protocol and not an
extension of any existing protocol. As such, there are no backward
compatibility issues expected. Overall this is a well written document. Som= e
ambiguity that needs attention are listed below. I chose "Has Issues&q= uot; primarily
to address the issue that may cause behavior inconsistency or traffic blakc=
holes. More details below:

yes, multipl= e thorough reviews came in, I'm incorporating comments and it will need= a document spin.
=C2=A0

--> LIE with TTL more than 1 is clearly defined to be discarded. I could= n't
find a similar clarification when TIE is received with TTL more than 1?. If= i
didn't miss it, I think it is better to be clarified for consistent beh= avior.

version -09 already says 

<t>The TIE exchange
    =
mechanism uses
    the port indicated by each node in the LIE
    exc=
hange and the interface on which the adjacency has been
    formed as de=
stination. It SHOULD use TTL of 1 as well and
    set inter-network cont=
rol precedence on according packets.
    </t>

=C2=A0

5.3.7.=C2=A0 Label Binding

=C2=A0 =C2=A0A node MAY advertise on its TIEs a locally significant, downst= ream
=C2=A0 =C2=A0assigned label for the according interface.=C2=A0 One use of s= uch label is
=C2=A0 =C2=A0a hop-by-hop encapsulation allowing to easily distinguish forw= arding
=C2=A0 =C2=A0planes served by a multiplicity of RIFT instances.

--> Read this more than a couple of times and not sure if "for the = accordingly
interface" means assigning a locally unique label for each interface/a= djacency
or just one label for the node and advertise the same label over all adjace= ncy.

aha, yes, not clear. good catch. p= er interface (downstream unsolicited). will add. additionally, it says on i= ts TIEs but it's the LIE that has interface specific label.
<= div>
labels are optional in the schema so we can easily add t= hem later in all kind of variations as well as extend node and link capabil= ities with according indications.
=C2=A0

--> Since it is mentioned that the use of this label is for HbH encapsul= ation,
a node at Level n should install (or ignore) the label from node at Level (= n-1)
in its Incoming Label Mapping (ILM) table?
=C2=A0

--> On the same line, a node at Level n should install (or ignore) the l= abel
from node at Level (n-2)?.

--> I think some clarity is better to avoid traffic black holing due to<= br> inconsistent behavior.

well, spec says = only

"
One use of such label is
a hop-by-hop encapsulation allowing to e=
asily distinguish forwarding
planes served by a multiplicity of RIFT ins=
tances."

since there were discussions how to m= ulti-instantiate RIFT with dataplane (since control plane is so easy. to ru= n multiple times, even over same links).=C2=A0 If you suggest a good wordin= g and reference here we can add it to make the example ore specific. Observ= e that the use of the label is non-normative. I would expect people to writ= e drafts adding e.g. adjacency capability something saying "binding la= bel to ILM" and if the other side doesn't support that not adverti= se the label (kind of like BGP capabilities). Or they add their own optiona= l schema element saying "ILM-label" or something. Protocol will a= llow that fine as long it's optional and has no default. We just bump t= he schema minor version up and allocate new codepoint (i.e. thrift field nu= mber).
=C2=A0

5.3.8.1.=C2=A0 Global Segment Identifiers Assignment

=C2=A0 =C2=A0Global segment identifiers are normally assumed to be provided= by
=C2=A0 =C2=A0some kind of a centralized "controller" instance and= distributed to
=C2=A0 =C2=A0other entities.=C2=A0 This can be performed in RIFT by attachi= ng a
=C2=A0 =C2=A0controller to the Top-of-Fabric nodes at the top of the fabric= where
=C2=A0 =C2=A0the whole topology is always visible, assign such identifiers = and
=C2=A0 =C2=A0then distribute those via the KV mechanism towards all nodes s= o they
=C2=A0 =C2=A0can perform things like probing the fabric for failures using = a stack
=C2=A0 =C2=A0of segments.

--> According to RFC 8402, Global Segment is a generic term that refers = to a
segment from SR Global Block with instruction or forwarding semantic define= d at
the domain level. But it does not have a default instruction associated wit= h
it. I think the above should be more specific as Prefix SID or something related to RIFT.

we removed the detaile= d SR support into its own draft and now you mentioned it I think that belon= gs there with all the other considerations, otherwise we'll drag the wh= ole SR right back into RIFT draft which runs counter most comments that wha= t we have is too long already. So, I'm removing the whole SR section fr= om the main spec and punting the text to the authros of https://tools.ietf.org/html/dr= aft-zzhang-rift-sr-01

The SR draft seems expir= ed couple days ago, thought it was adopted actually, not sure what the stat= us is, up to the chairs.
=C2=A0

Few observations below:

Clos/Fat Tree:=C2=A0 This document uses the terms Clos and Fat Tree
=C2=A0 =C2=A0 =C2=A0 interchangeably whereas it always refers to a folded s= pine-and-
=C2=A0 =C2=A0 =C2=A0 leaf topology with possibly multiple PoDs and one or m= ultiple ToF

--> ToF and PoD were not expanded in the first occurrence. ToF was expla= ined
later.

expanded acronym but the sequenc= e is a circular dependency. Can't introduce ToF until I have fabric but= fabric hard to describe without mentioning planes/tof/pods as well since o= therwise it's not clear how those terms fold in.
=C2=A0<= /div>

--> While Southbound representation is explained in the terminology sect= ion,
northbound representation is not. I think it is better to define the same f= or
consistency.

done
=C2=A0<= /div>

Multiple
=C2=A0 =C2=A0 =C2=A0 adjacencies can be formed to a neighbor via parallel i= nterfaces
=C2=A0 =C2=A0 =C2=A0 but such adjacencies are NOT sharing a neighbor struct= ure.=C2=A0 Saying
=C2=A0 =C2=A0 =C2=A0 "neighbor" is thus equivalent to saying &quo= t;a three way adjacency".


yes, it's very different from OSPF= here.=C2=A0
=C2=A0
--> The above says "Multiple adjacencies can be formed to a neighbo= r.." where
the "neighbor" here is implicitly defining the remote node and th= en the
sentence further continues stating "Saying "neighbor" is thu= s equivalent to
saying "a three way adjacency"".=C2=A0 May be the first &quo= t;neighbor" can be changed to
"remote node"?

done, very goo= d improvement in language.
=C2=A0

mobility defined in Paragraph 17

--> I assume that you are referring to REQ#17?. I think it is better to = refer
it as REQ#17. But I will leave that to the authors to decide.

=C2=A0The solution should allow for access to link states of the
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 whole topology to enable efficien= t support for modern
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 control architectures like SPRING= [RFC7855] or PCE
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 [RFC4655].

--> RFC 7855 is an information RFC that outlines the problem statement a= nd use
case. I think you should refer RFC 8402 here for the SR architecture.

Section for SR removed into the SR with rift= draft.

requirements section removed complete= ly based on other reviewers' comments.
=C2=A0

"Future
=C2=A0 =C2=A0versions of this document may describe support for such tunnel= ing in
=C2=A0 =C2=A0RIFT."

--> Section 5.3.3.4 talks about Overlay encapsulation and leave it a bit=
ambiguous with the above statement. I think, it should be removed.

Yes, Pascal's idea that we moved into the f= uture. Sentence removed.
=C2=A0

already to HAT nodes with level different than the adjacent

--> HAT was first expanded in page 66 while the abbreviation is used in/= from
Page 34.

best I could do was to clarify= 
8.  [

       i)=
 the node is at level 0 and has no three way adjacencies
       already =
to Highest Adjacency Three-Way (HAT) nodes (defined in
       Section 4.=
2.7.1) with level different than the adjacent node OR
= =C2=A0
since we moved the whole ZTP detailed terminology from mai= n terminology section given it was overwhelming down into the ZTP section. =
=C2=A0

"scope of this document and may be covered in a separate document
=C2=A0 =C2=A0about policy guided prefixes [PGP reference]."

--> There is no PGP reference. This may need to be fixed or removed.
=

yes, it's a separate draft. To progress the= document to standard we actually have to remove all the references to draf= ts so I remove the reference here.
thanks

--- tony
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uHsbQvVbnHfVHfd7CW6XeDcxCPhSyuxBIQeCgw/ejTsdAw0GQKNOpckA25p42LSMd0b2zldiGgpOWHZY/S2CpA== X-MS-Exchange-Transport-CrossTenantHeadersStamped: CY4PR05MB2982 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.95,1.0.8 definitions=2019-11-04_08:2019-11-04,2019-11-04 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_spam_notspam policy=outbound_spam score=0 spamscore=0 lowpriorityscore=0 phishscore=0 bulkscore=0 priorityscore=1501 malwarescore=0 clxscore=1015 adultscore=0 impostorscore=0 mlxscore=0 mlxlogscore=834 suspectscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-1908290000 definitions=main-1911040141 Archived-At: Subject: [Rift] RIFT@IETF106 - Call for agenda items X-BeenThere: rift@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Discussion of Routing in Fat Trees List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 04 Nov 2019 14:13:01 -0000 Hi, We'll meet at 1:30pm on Thursday, November 21. As usual, please send agenda items, including draft name, presenter, and re= quested time. Thanks! Jeff & Jeffrey From nobody Mon Nov 4 07:25:36 2019 Return-Path: X-Original-To: rift@ietfa.amsl.com Delivered-To: rift@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id AEB7D12085B; Mon, 4 Nov 2019 07:25:22 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.997 X-Spam-Level: X-Spam-Status: No, score=-1.997 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id mji1KbsZ5dz7; Mon, 4 Nov 2019 07:25:17 -0800 (PST) Received: from mail-il1-x133.google.com (mail-il1-x133.google.com [IPv6:2607:f8b0:4864:20::133]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 2B81D12011F; Mon, 4 Nov 2019 07:25:17 -0800 (PST) Received: by mail-il1-x133.google.com with SMTP id f201so9497127ilh.6; Mon, 04 Nov 2019 07:25:17 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=sQ7zgMqoepcPxpM/LFdRbO+xQ+Rq3cOXCsd7kz0Fx3I=; b=lGfOd1lARSvyBjzNFXmZTGRuytyf5x0zAa2Jo/wl2iBFbSy48hOf5ZZ1OfSBfieZPs ydcKBrUInVj1fn4KfjGlj6kP0VM4ZJQmKzFvx8WXiwVUMpIIf/aA2Ct02ntJz2sfcc2r FSyOMRPnsVA7nTNpNiegERxShkT/NwWzAacAuPENeVmyIchT1xQshsGV11C31wotfbQU 0qq8Pz0fCsRgYVanL32G/7fT43+AGeBaziWpm49NbrAieUpPDgXh7fswjODjPVpBE+h1 izz5MoIdr7NO6fDI5WGI8CtvCk8A0HPWU+V2GxwKTc88xvAt7g4LgCiYRZhXOBBSzjyc pElg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=sQ7zgMqoepcPxpM/LFdRbO+xQ+Rq3cOXCsd7kz0Fx3I=; b=sxAqKgAFLrLmo8EaFQaKjLYzn82JgOKh0tcOOZ7qXXTt65MXG8ticQfZJiVBp+eBg6 tMJQ4GlUEgpFeWT3A4heNvQoi8UmJUxFdCyVyXfGUwiTWRpfdqpTBeoXndbw/dLF3R8r iJbwD3gG2swnhEVIYPbkghewH85/YBtivVSX3GBcQPHbWT7p+zjC7dFC63CJeoFeLO+8 XiLb70cyiOG3gl8Y4aABbauH/JTY9XZjZPiwoI6hbHohYhQW2vuq1tDy6LAQFnQvXt5o 65AsoNU8Yi/DYTIF/rLsnDjqFF5uxZY5bOd8dQcg6FxTqxVJlNI2skj1ZBmT8kcov3Ro tvmA== X-Gm-Message-State: APjAAAXxcaLHB3vDSiuo3ZdPu3EMdjVEPLzH/rrwCMFPmb4dD/+YGx10 yu+NmSvs5iRdeW6FR7u5uL1XTmJayGVFh7rpjpE= X-Google-Smtp-Source: APXvYqzGD2GAk6OgQbSvmQUf3WyxnJ4qR+2FkyHsf+lN/7LOeJi7UdUVQYsAlj0FAtxFF+whM2L2/rOH9X3wZ45miuI= X-Received: by 2002:a92:5c15:: with SMTP id q21mr29096105ilb.239.1572881116446; Mon, 04 Nov 2019 07:25:16 -0800 (PST) MIME-Version: 1.0 References: In-Reply-To: From: Tony Przygienda Date: Mon, 4 Nov 2019 07:24:23 -0800 Message-ID: To: Jonathan Hardwick Cc: "rift-chairs@ietf.org" , "draft-ietf-rift-rift.all@ietf.org" , "rtg-dir@ietf.org" , =?UTF-8?Q?Luc_Andr=C3=A9_Burdet?= , Min Ye , "rift@ietf.org" Content-Type: multipart/alternative; boundary="000000000000384761059686ec9d" Archived-At: Subject: Re: [Rift] Routing directorate early review of draft-ietf-rift-rift X-BeenThere: rift@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Discussion of Routing in Fat Trees List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 04 Nov 2019 15:25:23 -0000 --000000000000384761059686ec9d Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Mon, Nov 4, 2019 at 4:40 AM Jonathan Hardwick < Jonathan.Hardwick@metaswitch.com> wrote: > Tony, many thanks for your reply =E2=80=93 please see [JEH] below. > > Jon > > > > > > We are in IETF here where "rough consenus and running code" was the > receipe of success vs. much heavier handed organizations like OSI and I > think in this philosophy the spec, if anything, is possibly overspecified > already ;-) The core pieces that bare no slips like flooding and adjacenc= y > formation are very precisely written including FSMs. > > > > [JEH] Sure. My comments were intended to help improve the use of > normative language and the delineation between normative passages and > informative ones. > > > we're in sync, I am tightening normative language where necessary. Will take until next rev, I try to put out today intermediate state with lots review comments accommodate but won't manage to get e'thing in until the one after. > > > > - > - The definition of the protocol and some of the normative behaviour > is deferred to the appendices, whereas I would expect to encounter it = early > on in the text, with an in-line discussion of the purposes of the mess= ages > and fields. > > > > Ok, seems like the second directorate reviewers prefers the appendices to > be pulled into the document. Let me do that thenl > > > > [JEH] My apologies =E2=80=93 it is unfortunate when two different reviewe= rs give > contradictory opinions! You should of course weigh my opinion with > everyone else=E2=80=99s. > no, actually you're the second IAB/DIR reviewer who said that. However, earlier on I had gripes that the spec is "too dry" and it's hard to know "why" things are done so I try to strike a balance between a descriptive and prescriptive piece. Since it's always a trade-off not everyone will be ever fully happy with the balance and I can live with that ;-) > > > > > > > The other issue is that, because the document is large and I found it > rather hard going, I did not have time do a thorough review beyond sectio= n > 5.3. I=E2=80=99d therefore have to recommend another directorate review = once we > have concluded on the issues I=E2=80=99m raising below. > > > > ok, obviously as much is written as we expect is necessary to "clearly" > spec out the protocol. The document is more than simply a dry prescriptiv= e > normative though since very early in the workgroup sessions the input of > many people was that they would prefer is some more "narrative" explanati= on > of "what" and "why" is inserted instead of purely the algorithms. We trie= d > to find a balance but obviously opinions will always vary between "this i= s > too chatty and should be just a dry normative" and "this does not explain > WHY that would work and WHY it has been designed that way".. Based on > Robert Sparks review I will try to simplify the language and cut out some > superfluous text he pointed out or I find. We'll see where we end. > > > > [JEH] Thanks. As it happens I prefer documents to have informative > passages to help me understand the normative ones, provided they give me > enough context to understand them and they are sufficiently relevant. My > comments were targeted to help improve the context & relevance. I sugges= t > a subsequent RtgDir review only because I was not able to apply as much > diligence to the later sections of the document as I would have liked. I > will leave it to the WG if they want to action this. > > > ... ack Jonathan, well, section 5.1.3 "fallen leaf" (4 now given requirements is > removed) _is_ the overview section. Southern reflection is defined in the > glossary already and the "negative disaggregation" is a mechanism > introduced to address the "fallen leaf problem" later and obviously the > problem itself has to be explained & introduced first. Negative > disaggregation is arguably (beside flooding scopes) the most complex part > of the spec and we spent lots of time and effort (especially Pascal) with > multiple rewrites to give the narrative describing the CLOS inherent > problem. Moreover we didn't want to mix it up with RIFT specific mechanis= m > since the "fallen leaf": problem exists in multi-plane CLOS independent o= f > any protocol and BTW, I never saw it explained as clearly as Pascal did i= n > the multi-plane introduction section. Also, we clearly state in the secti= on > that if someone builds a single plane CLOS the section can be disregarded > to simplify the reading of the spec for many people. > > > > [JEH] Thanks. Firstly, Pascal is to be congratulated on the text > describing multi-plane topologies. I had no problem getting to grips with > them with the help of his text and some Lego models that it inspired me t= o > build :-) I have re-read these sections just now and I do now find them > easier to follow =E2=80=93 having already read the relevant parts of the = later > spec. On the first read-through I think I was troubled by too many > questions: What do they mean by =E2=80=9Cpositive=E2=80=9D and =E2=80=9Cn= egative=E2=80=9D in the context of > disaggregation? What do they mean by =E2=80=9Ctransitive=E2=80=9D? I ha= ve been told what > southern reflection is, but what relevant information does it provide and > how is it useful? In hindsight these were all guessable but I found thes= e > concepts a barrier to my understanding. If you have the stomach for > another iteration of these sections, I would request some additional > explanation to be included. > > > Lego blocks is an ingenious idea here. You inspire me to go steal some from my kids now ;-) OK, yes, so I will put explanations of what negative and positive is and transitive in the running descriptive text if that simplifies the "sliding into the narrative". That's a good input. Obviusly at the end all the authors/contributors were cmpletely blind to whether it's comprehensible anymore sicne we spent I think about 3 versions of text and endless interims chewing on how to describe all that "fallen leaf" stuff, especially wiht 2-D ASCII art. Most credit goes to Pascal really I think without diminishing others that were helping with it. > > > > > Section 5.2.2 > > > > A node configured with "undefined" PoD membership MUST, after > > building first northbound three way adjacencies to a node being in a > > defined PoD, advertise that PoD as part of its LIEs. In case that > > adjacency is lost, from all available northbound three way > > adjacencies the node with the highest System ID and defined PoD is > > chosen. > > > > It seems odd that the choice of advertised pod is at first > non-deterministic (race to the first adjacency) and then, only if this > initial adjacency is lost, the choice of pod becomes deterministic. Why n= ot > make it deterministic the whole time? > > > > The first adjacency is simply used to speed up things since otherwise how > long do you wait until you have all northbound adjacencies? Observe that > level ZTP will possibly drop adjacencies while it's converging so the > consequent set will refine the PoD as well, i.e. the ZTP is guaranteed to > get the node to the maximum available level @ which point in time the > northbound available adjacencies will determine the PoD. Obviouly the > adjacencies can disagree about the PoD and such a scenario can be used by > an implementation to report miscablings. We talk quickly about miscabling > detection in the spec since it's such a desirable property _of an > implementaiton_ but it's not necessary for correct protocol operation so = we > don't make anything normative except disallowing adjacency forming across > PoDs if defined. Since configurting and converging PoDs is optional we > allow even to disregard this rule on adjacency formation. > > > > [JEH] Thanks =E2=80=93 makes sense. I had missed that ZTP can drop adjace= ncies > when I wrote this comment. > ack > > > > > Section 5.2.3.2 > > > > In the example TIEs, "Spine21" should be "ToF 21" to agree with the > nomenclature of figure 2. Ditto in table 4 (section 5.2.3.4) > > In Spine 111's Node-S-TIE, I am not sure that the links(...) should be > given for each neighbor. > > > > corrected the ToF 21/22 everywhere. Yes, on careful reading one wonders > WHY node south tie should include _all_ links. This is necessary for both > flood reduction as well as bandwidth balancing since both happen from sou= th > going up and the node computing needs the northbound neighbors of the lev= el > up. That's one of the reasons the example is givne. I'll add a clarifying > sentence. > > > > [JEH] Thanks. Does that mean the links(=E2=80=A6) should be added to Spin= e121=E2=80=99s > Node S-TIE in the same example? > yes, @ certain point I think it starts to do elipsis to avoid endless repetitions. I'll comb over it quickly again. > Section 5.2.4.1 > > Please define the terms "south prefix" and "north prefix" > > "Supersuming" is not a word I recognise. Use "or a non-default prefix > which contains this south prefix" > > "the node does not..." -> "the computing node does not..." > > > > Section 5.2.4.2 > > "S-SPF uses northbound adjacencies in node N-TIEs to verify backlink > connectivity" - this statement needs to be recast into normative language > using RFC 2119 terms. "A node MUST verify backlink connectivity ... Else > it MUST NOT include the link.... Etc." > > Same comment applies in many places throughout the document. > > > > re-read and applied more normative language to the specific section as > indicated above. Re-read the document and normalized more languagte wher= e > necessary. > > > > > > Section 5.2.4.3 > > What is a `"ring protection" scheme`? > > > > Ring based protection scheme just like BLSR. I replace with "ring-based > protection" which is fairly well understood term in networking. > > > > Removed the ring based protection of a level to applicability draft which > multiple authors work on and where it seems to belong rather than in the > spec. Left only clarification > > > > <*t*>Using south prefixes over horizontal links MAY occur > if the N-SPF is East-West adjacencies in computation. > It can > protect against pathological fabric partitioning cases that > leave only paths to destinations that would necessitate multiple > changes of forwarding direction between north and south. > > > > > [JEH] Suggest you change =E2=80=9Cif the N-SPF is East-West adjacencies= =E2=80=9D to =E2=80=9Cif > the N-SPF includes East-West adjacencies=E2=80=9D > ack, typo. thanks > > > "An implementation could try ... but the details are outside this > specification" - so why mention it? > > > > Because of the fact that the question was coming up multiple times in > meetings/mails and so on. Instead of negative disaggregation people were > tempted to "forward through the horizontal links on top" when a fallen le= af > starts forwarding in the wrong plane (i.e. the one where it's fallen). Th= is > section points out that this should not be attempted due to looping > problems, i.e. a ToF node that has no reachability to an anycast address > (since a fallen leaf forwarded to an anycast destination that is also > fallen) could try to use horizontal links to forward traffic but it may > have multiple planes that can reach the destination. Obviously when it > forwards e.g. left on the ring & the traffic arrives on the ToF that seem= s > to be able to reach that anycast the ToF may choose to forward it back on > the ring to "another ToF" that can reach the anycast. Observer that RIFT = is > loop-free i.e. one can forward on any path as long it reaches the > destination but since horizontal is considered equivalent to northbound > forwarding and metric can be disregarded (RIFT is not bound by shortest > path) the traffic may just end up looping in the ring. This is hard to > describe and would to lots figures hence the spec simply says "don't do i= t" > and if one is tempted to one will find out why it's a bad idea when one > implemented this. And then the said implementer will probably try to fix = it > by the "shortest path" computation @ ToF level which is next layer of the > onion the document mentions and then explains again that this may work bu= t > he stop going out there with this spec. > > > > The "ring" between planes necessary is visualized in figure 13 and > described in section > > > > 4.2.5.2.1. Cabling of Multiple Top-of-Fabric Planes > > > > again in an example. I don't think that needs further clarification. > > > > [JEH] Understood. I would suggest moving =E2=80=9CAn implementation could= =E2=80=A6=E2=80=9D to a > footnote =E2=80=93 if only one could have footnotes in an RFC. > yeah, I won't try footnote adventures ;-) I'm trying to migrate to v3 to include SVG already and feeling like a serious guinea pig right now ;-) > > > > > > > How can we guarantee that a same-level node does not have a next hop to a > given prefix that is unknown to the node doing the computation? If X > reaches P via N1 and N2, Y (at the same level as X) can reach P via N3 bu= t > X does not know this and assumes Y cannot reach P because Y is not adjace= nt > to N1 and N2, then X unnecessarily disaggregates P positively. For > instance if X's link to N3 has failed and Y's links to N1 and N2 have > failed. > > > > that cannot be guaranteed. If X can reach prefix via N1 which Y doesn't > have and Y via N3 that X doesn't have but they only see via a nexthops N0 > (though which the prefix cannot be reached) then both will disaggregate > since anything else would be assuming necessity of "harmonica routing" > which RIFT doesn't do since harmonica is opposite to valley free routing > which RIFT does to guarantee loop free behavior. That is actually a good > example why RIFT positive disaggregation guarantees sufficient > disaggregation to prevent blackholes, loops and bow-ties but possibly mor= e > than necessary (which is never claimed in the document). > > > > [JEH] Understood. So there may be redundant disaggregation but it keeps > the forwarding plane valley free. I think that=E2=80=99s OK. > yes, I was thinking ages ago through implications of making RIFT "sufficient _and_ necessary only" and you end up with global vs. local optimality problem which forces you pretty much to have all the info everywhere to find a global optimum (well, topology info, you could skip prefixes I think). Or harmonica routing which leads straight back to traditional link-state with all its problems in the fabric. And all that would lead to very complex flooding scopes (the ones we have are complex enough and that's why they are so precisely described in the table & flooding rules) and so on, IMO it's 80-20 rule here, "sufficient" must be guaranteed (otherwise you loop or if lucky, bowtie), "necessary only" is a luxury we should not chase ;-) > > > This constant is provided in appendix D.1 > > > > I'm working on the other directorate reviews and will try to cut a new > version with all those changes before deadline > > > > [JEH] Thanks again for considering all my comments. > > > well, thanks for your time. I know the draft takes time to comprehend given how far it sometimes stretches IP routing envelope compared to traditional stuff. Glad you saw it as a puzzle ;-) And now, for those lego blocks ;-) --- tony --000000000000384761059686ec9d Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable


=
On Mon, Nov 4, 2019 at 4:40 AM Jonath= an Hardwick <Jonatha= n.Hardwick@metaswitch.com> wrote:

Tony, many thanks for your repl= y =E2=80=93 please see [JEH] below.

Jon

=C2=A0

=C2=A0

We are in IETF here where "rough consenus and r= unning code" was the receipe of success vs. much heavier handed organi= zations like OSI and I think in this philosophy the spec, if anything, is p= ossibly overspecified already ;-) The core pieces that bare no slips like flooding and adjacency formation are very precisel= y written including FSMs.

=C2=A0

[JEH] Sure.=C2=A0 My comments were intended to help = improve the use of normative language and the delineation between normative= passages and informative ones.

=C2=A0


we're in sync, I am tightening normative lan= guage where necessary. Will take until next rev, I try to put out today int= ermediate state with lots review comments accommodate but won't manage = to get e'thing in until the one after.
=C2=A0

=C2=A0

  • =C2=A0
  • The definition of the protocol and some of the normati= ve behaviour is deferred to the appendices, whereas I would expect to encou= nter it early on in the text, with an in-line discussion of the purposes of= the messages and fields.

=C2=A0

Ok, seems like the second directorate reviewers pref= ers the appendices to be pulled into the document. Let me do that thenl

=C2=A0

[JEH] My apologies =E2=80=93 it is unfortunate when = two different reviewers give contradictory opinions!=C2=A0 You should of co= urse weigh my opinion with everyone else=E2=80=99s.


no, actually you're th= e second IAB/DIR reviewer who said that. However, earlier on I had gripes t= hat the spec is "too dry" and it's hard to know "why&quo= t; things are done so I try to strike a balance between a descriptive and p= rescriptive piece. Since it's always a trade-off not everyone will be e= ver fully happy with the balance and I can live with that ;-)
=C2=A0
<= div>

=C2=A0

=C2=A0

=C2=A0

The other issue is that, becaus= e the document is large and I found it rather hard going, I did not have ti= me do a thorough review beyond section 5.3.=C2=A0 I=E2=80=99d therefore have to recommend another directorate review once we have concluded on the= issues I=E2=80=99m raising below.

=C2=A0

ok, obviously as much is written as we expect is nec= essary to "clearly" spec out the protocol. The document is more t= han simply a dry prescriptive normative though since very early in the work= group sessions the input of many people was that they would prefer is some more "narrative" explanation of &= quot;what" and "why" is inserted instead of purely the algor= ithms. We tried to find a balance but obviously opinions will always vary b= etween "this is too chatty and should be just a dry normative" and "this does not explain WHY that would work and WHY it has been de= signed that way".. Based on Robert Sparks review I will try to simplif= y the language and cut out some superfluous text he pointed out or I find. = We'll see where we end.

=C2=A0

[JEH] Thanks.=C2=A0 As it happens I prefer documents= to have informative passages to help me understand the normative ones, pro= vided they give me enough context to understand them and they are sufficien= tly relevant.=C2=A0 My comments were targeted to help improve the context & relevance.=C2=A0 I suggest a subsequent = RtgDir review only because I was not able to apply as much diligence to the= later sections of the document as I would have liked.=C2=A0 I will leave i= t to the WG if they want to action this.

=C2=A0

...

ack

Jonathan, well, section 5.1.3 "fallen leaf"= ; (4 now given requirements is removed) _is_ the overview section. Southern= reflection is defined in the glossary already and the "negative disag= gregation" is a mechanism introduced to address the "fallen leaf problem" later and obviously the problem itself has= to be explained & introduced first. Negative disaggregation is arguabl= y (beside flooding scopes) the most complex part of the spec and we spent l= ots of time and effort (especially Pascal) with multiple rewrites to give the narrative describing the CLOS inherent probl= em. Moreover we didn't want to mix it up with RIFT specific mechanism s= ince the "fallen leaf": problem exists in multi-plane CLOS indepe= ndent of any protocol and BTW, I never saw it explained as clearly as Pascal did in the multi-plane introduction section= . Also, we clearly state in the section that if someone builds a single pla= ne CLOS the section can be disregarded to simplify the reading of the spec = for many people.

=C2=A0

[JEH] Thanks. Firstly, Pascal is to be congratulated= on the text describing multi-plane topologies. I had no problem getting to= grips with them with the help of his text and some Lego models that it ins= pired me to build :-)=C2=A0 I have re-read these sections just now and I do now find them easier to follow =E2=80=93 = having already read the relevant parts of the later spec.=C2=A0 On the firs= t read-through I think I was troubled by too many questions: What do they m= ean by =E2=80=9Cpositive=E2=80=9D and =E2=80=9Cnegative=E2=80=9D in the con= text of disaggregation?=C2=A0 What do they mean by =E2=80=9Ctransitive=E2=80=9D= ?=C2=A0 I have been told what southern reflection is, but what relevant inf= ormation does it provide and how is it useful?=C2=A0 In hindsight these wer= e all guessable but I found these concepts a barrier to my understanding.= =C2=A0 If you have the stomach for another iteration of these sections, I would r= equest some additional explanation to be included.

=C2=A0


Lego blocks is an ingenious idea here. Yo= u inspire me to go steal some from my kids now ;-)

OK, yes, so I will put explanations of what negative and positive is and t= ransitive in the running descriptive text if that simplifies the "slid= ing into the narrative". That's a good input. Obviusly at the end = all the authors/contributors were cmpletely blind to whether it's compr= ehensible anymore sicne we spent I think about 3 versions of text and endle= ss interims chewing on how to describe all that "fallen leaf" stu= ff, especially wiht 2-D ASCII art. Most credit goes to Pascal really I thin= k without diminishing others that were helping with it.
=C2= =A0
=

=C2=A0

=C2=A0

Section 5.2.2<= /u>

=C2=A0

=C2=A0=C2=A0 A node configured = with "undefined" PoD membership MUST, after<= /p>

=C2=A0=C2=A0 building first nor= thbound three way adjacencies to a node being in a

=C2=A0=C2=A0 defined PoD, adver= tise that PoD as part of its LIEs.=C2=A0 In case that<= /p>

=C2=A0=C2=A0 adjacency is lost,= from all available northbound three way

=C2=A0=C2=A0 adjacencies the no= de with the highest System ID and defined PoD is

=C2=A0=C2=A0 chosen.<= /u>

=C2=A0

It seems odd that the choice of= advertised pod is at first non-deterministic (race to the first adjacency)= and then, only if this initial adjacency is lost, the choice of pod becomes deterministic. Why not make it deterministic the who= le time?

=C2=A0

The first adjacency is simply used to speed up thing= s since otherwise how long do you wait until you have all northbound adjace= ncies?=C2=A0 Observe that level ZTP will possibly drop adjacencies while it= 's converging so the consequent set will refine the PoD as well, i.e. the ZTP is guaranteed to get the node to the = maximum available level=C2=A0@ which point in time the northbound available= adjacencies will determine the PoD. Obviouly the adjacencies can disagree = about the PoD and such a scenario can be used by an implementation to report miscablings. We talk quickly about = miscabling detection in the spec since it's such a desirable property _= of an implementaiton_ but it's not necessary for correct protocol opera= tion so we don't make anything normative except disallowing adjacency forming across PoDs if defined. Since configu= rting and converging PoDs is optional we allow even to disregard this rule = on adjacency formation.=C2=A0

=C2=A0

[JEH] Thanks =E2=80=93 makes sense. I had missed tha= t ZTP can drop adjacencies when I wrote this comment.

=

ack
=C2=A0=

=C2=A0

=C2=A0

Section 5.2.3.2

=C2=A0

In the example TIEs, "Spin= e21" should be "ToF 21" to agree with the nomenclature of fi= gure 2.=C2=A0 Ditto in table 4 (section 5.2.3.4)

In Spine 111's Node-S-TIE, = I am not sure that the links(...) should be given for each neighbor.=

=C2=A0

corrected the ToF 21/22 everywhere.=C2=A0 Yes, on ca= reful reading one wonders WHY node south tie should include _all_ links. Th= is is necessary for both flood reduction as well as bandwidth balancing sin= ce both happen from south going up and the node computing needs the northbound neighbors of the level up. That= 9;s one of the reasons the example is givne. I'll add a clarifying sent= ence.

=C2=A0

[JEH] Thanks. Does that mean the links(=E2=80=A6) sh= ould be added to Spine121=E2=80=99s Node S-TIE in the same example?


yes, @ cer= tain point I think it starts to do elipsis to avoid endless repetitions. I&= #39;ll comb over it quickly again.
=C2=A0

Section 5.2.4.1

Please define the terms "s= outh prefix" and "north prefix"

"Supersuming" is not = a word I recognise.=C2=A0 Use "or a non-default prefix which contains = this south prefix"

"the node does not..."= ; -> "the computing node does not..."

=C2=A0

Section 5.2.4.2

"S-SPF uses northbound adj= acencies in node N-TIEs to verify backlink connectivity" - this statem= ent needs to be recast into normative language using RFC 2119 terms.=C2=A0 "A node MUST verify backlink connectivity ... Else it MU= ST NOT include the link.... Etc."

Same comment applies in many pl= aces throughout the document.

=C2=A0

re-read and applied more normative language to the s= pecific section as indicated above.=C2=A0 Re-read the document and normaliz= ed more languagte where necessary.

=C2=A0

=C2=A0

Section 5.2.4.3

What is a `"ring protectio= n" scheme`?

=C2=A0

Ring based protection scheme just like BLSR. I repla= ce with "ring-based protection" which is fairly well understood t= erm in networking.

=C2=A0

Removed the ring based protection of a level to appl= icability draft which multiple authors work on and where it seems to belong= rather than in the spec. Left only clarification

=C2=A0

<t>Using south prefixes over ho=
rizontal links MAY occur
=C2=A0if the N-SPF is East-West adjacencies in =
computation.
=C2=A0=C2=A0=C2=A0 It can
=C2=A0=C2=A0=C2=A0 protect aga=
inst pathological fabric partitioning cases that
=C2=A0=C2=A0=C2=A0 leav=
e only paths to destinations that would necessitate multiple
=C2=A0=C2=
=A0=C2=A0 changes of forwarding direction between north and south.
=C2=
=A0=C2=A0=C2=A0 </t>

=C2=A0

[JEH] Suggest you change =E2=80=9Cif the N-SPF is Ea= st-West adjacencies=E2=80=9D to =E2=80=9Cif the N-SPF includes East-West ad= jacencies=E2=80=9D


ack, typo. thanks
=C2=A0

=C2=A0

"An implementation could t= ry ... but the details are outside this specification" - so why mentio= n it?

=C2=A0

Because of the fact that the question was coming up = multiple times in meetings/mails and so on. Instead of negative disaggregat= ion people were tempted to "forward through the horizontal links on to= p" when a fallen leaf starts forwarding in the wrong plane (i.e. the one where it's fallen). This section poin= ts out that this should not be attempted due to looping problems, i.e. a To= F node that has no reachability to an anycast address (since a fallen leaf = forwarded to an anycast destination that is also fallen) could try to use horizontal links to forward traffic = but it may have multiple planes that can reach the destination. Obviously w= hen it forwards e.g. left on the ring & the traffic arrives on the ToF = that seems to be able to reach that anycast the ToF may choose to forward it back on the ring to "another= ToF" that can reach the anycast. Observer that RIFT is loop-free i.e.= one can forward on any path as long it reaches the destination but since h= orizontal is considered equivalent to northbound forwarding and metric can be disregarded (RIFT is not bound by shortest pa= th) the traffic may just end up looping in the ring. This is hard to descri= be and would to lots figures hence the spec simply says "don't do = it" and if one is tempted to one will find out why it's a bad idea when one implemented this. And then the said i= mplementer will probably try to fix it by the "shortest path" com= putation=C2=A0@ ToF level which is next layer of the onion the document men= tions and then explains again that this may work but he stop going out there with this spec.

=C2=A0

The "ring" between planes necessary is vis= ualized in figure 13 and described in section

=C2=A0

4.2.5.2.1.=C2=
=A0 Cabling of Multiple Top-of-Fabric Planes

=C2=A0

again in an example. I don't think that needs fu= rther clarification.

=C2=A0

[JEH] Understood. I would suggest moving =E2=80=9CAn= implementation could=E2=80=A6=E2=80=9D to a footnote =E2=80=93 if only one= could have footnotes in an RFC.


yeah, I won't try footnote adventures ;-)= I'm trying to migrate to v3 to include SVG already and feeling like a = serious guinea pig right now ;-)
=C2=A0

=C2=A0

=C2=A0

=C2=A0

How can we guarantee that a sam= e-level node does not have a next hop to a given prefix that is unknown to = the node doing the computation?=C2=A0 If X reaches P via N1 and N2, Y (at the same level as X) can reach P via N3 but X does not kn= ow this and assumes Y cannot reach P because Y is not adjacent to N1 and N2= , then X unnecessarily disaggregates P positively.=C2=A0 For instance if X&= #39;s link to N3 has failed and Y's links to N1 and N2 have failed.

=C2=A0

that cannot be guaranteed. If X can reach prefix via= N1 which Y doesn't have and Y via N3 that X doesn't have but they = only see via a nexthops N0 (though which the prefix cannot be reached) then= both will disaggregate since anything else would be assuming necessity of "harmonica routing" which RIFT do= esn't do since harmonica is opposite to valley free routing which RIFT = does to guarantee loop free behavior.=C2=A0 That is actually a good example= why RIFT positive disaggregation guarantees sufficient disaggregation to prevent blackholes, loops and bow-ties but possibly more= than necessary (which is never claimed in the document). =C2=A0

=C2=A0

[JEH] Understood. So there may be redundant disaggre= gation but it keeps the forwarding plane valley free.=C2=A0 I think that=E2= =80=99s OK.


yes, I was thinking ages ago through implications of making RIFT &= quot;sufficient _and_ necessary only" and you end up with global vs. l= ocal optimality problem which forces you pretty much to have all the info e= verywhere to find a global optimum (well, topology info, you could skip pre= fixes I think). Or harmonica routing which leads straight back to tradition= al link-state with all its problems in the fabric. And all that would lead = to very complex flooding scopes (the ones we have are complex enough and th= at's why they are so precisely described in the table & flooding ru= les) and so on, IMO it's 80-20 rule here, "sufficient" must b= e guaranteed (otherwise you loop or if lucky, bowtie), "necessary only= " is a luxury we should not chase ;-)
=C2=A0

=C2=A0

This constant is provided in appendix D.1 =

=C2=A0

I'm working on the other directorate reviews and= will try to cut a new version with all those changes before deadline

=C2=A0

[JEH] Thanks again for considering all my comments.<= u>

=C2=A0


well, thanks for your time. I know the dr= aft takes time to comprehend given how far it sometimes stretches IP routin= g envelope compared to traditional stuff. Glad you saw it as a puzzle ;-)

And now, for those lego blocks ;-)

--- tony
=C2=A0
--000000000000384761059686ec9d-- From nobody Mon Nov 4 13:07:52 2019 Return-Path: X-Original-To: rift@ietf.org Delivered-To: rift@ietfa.amsl.com Received: from ietfa.amsl.com (localhost [IPv6:::1]) by ietfa.amsl.com (Postfix) with ESMTP id 1D84312022D; Mon, 4 Nov 2019 13:07:44 -0800 (PST) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit From: internet-drafts@ietf.org To: Cc: rift@ietf.org X-Test-IDTracker: no X-IETF-IDTracker: 6.108.0 Auto-Submitted: auto-generated Precedence: bulk Reply-To: rift@ietf.org Message-ID: <157290166404.13972.15566452810164919612@ietfa.amsl.com> Date: Mon, 04 Nov 2019 13:07:44 -0800 Archived-At: Subject: [Rift] I-D Action: draft-ietf-rift-rift-09.txt X-BeenThere: rift@ietf.org X-Mailman-Version: 2.1.29 List-Id: Discussion of Routing in Fat Trees List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 04 Nov 2019 21:07:44 -0000 A New Internet-Draft is available from the on-line Internet-Drafts directories. This draft is a work item of the Routing In Fat Trees WG of the IETF. Title : RIFT: Routing in Fat Trees Authors : Tony Przygienda Alankar Sharma Pascal Thubert Bruno Rijsman Dmitry Afanasiev Filename : draft-ietf-rift-rift-09.txt Pages : 154 Date : 2019-11-04 Abstract: This document defines a specialized, dynamic routing protocol for Clos and fat-tree network topologies optimized towards minimization of configuration and operational complexity. The protocol deals with no configuration, fully automated construction of fat- tree topologies based on detection of links, minimizes the amount of routing state held at each level, automatically prunes and load balances topology flooding exchanges over a sufficient subset of links, supports automatic disaggregation of prefixes on link and node failures to prevent black-holing and suboptimal routing, allows traffic steering and re-routing policies, allows loop-free non-ECMP forwarding, automatically re-balances traffic towards the spines based on bandwidth available and finally provides mechanisms to synchronize a limited key-value data-store that can be used after protocol convergence to e.g. bootstrap higher levels of functionality on nodes. The IETF datatracker status page for this draft is: https://datatracker.ietf.org/doc/draft-ietf-rift-rift/ There are also htmlized versions available at: https://tools.ietf.org/html/draft-ietf-rift-rift-09 https://datatracker.ietf.org/doc/html/draft-ietf-rift-rift-09 A diff from the previous version is available at: https://www.ietf.org/rfcdiff?url2=draft-ietf-rift-rift-09 Please note that it may take a couple of minutes from the time of submission until the htmlized version and diff are available at tools.ietf.org. Internet-Drafts are also available by anonymous FTP at: ftp://ftp.ietf.org/internet-drafts/ From nobody Mon Nov 4 13:12:18 2019 Return-Path: X-Original-To: rift@ietfa.amsl.com Delivered-To: rift@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id C5FD4120096 for ; Mon, 4 Nov 2019 13:12:16 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.997 X-Spam-Level: X-Spam-Status: No, score=-1.997 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id xyXl294qURC4 for ; Mon, 4 Nov 2019 13:12:14 -0800 (PST) Received: from mail-io1-xd33.google.com (mail-io1-xd33.google.com [IPv6:2607:f8b0:4864:20::d33]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 4055812007C for ; Mon, 4 Nov 2019 13:12:14 -0800 (PST) Received: by mail-io1-xd33.google.com with SMTP id p6so20142903iod.7 for ; Mon, 04 Nov 2019 13:12:14 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to; bh=zkrNcvL1Dyjr5nKfAQ6dBziKtdJ4XXLtWlOpFfzNckA=; b=aoEdoJLvGM6I9lwjSWTB6GU69vPm1kBKOSqaq4D6TVwFUMnUhSm24oepsXwZSgMJBZ Jf5l8E09RM4kUuHpq98AhS1Ig/14b4kuo4Tps0Jqqe/mjKaHHPkPnHQGtuYBUyJ3oJ8m 0z2+y+llPqUv1B70xAAU8Ziit7y17iKwvXdEP5J2Ly8+2VZFaFqwrhliomwg6um6pnrq zkR+A1NpVE8PonIQnqy0CGg0FVE1WsP3vyNUCBqcdBJS5vNNmOMQHTL47xZdh3mGRgzM 8fh0cixz06FujG50Dtr6xFJhgXlNgtdSZsSIGzoNQvnGOZsJHbAWpDGk6oYSS2E/WeO5 S7tQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to; bh=zkrNcvL1Dyjr5nKfAQ6dBziKtdJ4XXLtWlOpFfzNckA=; b=tDMJWiiYYUmUEZkneWu70xCtBIOQQ4yG6p13iGlqtBTw8XfUJ99ho1ldgB4yBvf4o1 y0dNHifJikHqzxnjDBCP/3fleH3wdEa3zqhgT2KBfvLRhi0oohKYgnmYl8dTVDTgN9l5 DURbsJ31j+6EdIE1tXSRjgRHNWMn+V/8var2jT8iR871Wj9eFghYvDDkFYtQ3Tjo8mic dyS6gfnBYwnTlEUyR2BZ4csVhYOtlng9Kp6guh+yKcThN0kq7gROv46kr4+nPSc/7rFc LP1d5DLOthPMHVs7ewaBnACaz2hEy890iHQBTk0MNy0WVIYbKZpHqSE4VxcIRgg0CV2j auuw== X-Gm-Message-State: APjAAAX3/vfPajYsYrWYw0V/yknAwJCjSV4donhIwF0Mkmslx8vHIjwt oWZeR5xSS/CtdvMQ3bHHxl+F+MA3640mLLTST1fIADnj X-Google-Smtp-Source: APXvYqzVp4r1FPrZVn0eadHYS4ZnvkrvJMcL5PDze2VaAsw0GRZoQnLglY8PCkz3HNAWDfZ9ODQAogBDCg1rzgtBzOI= X-Received: by 2002:a05:6638:626:: with SMTP id h6mr2376845jar.113.1572901933328; Mon, 04 Nov 2019 13:12:13 -0800 (PST) MIME-Version: 1.0 References: <157290166404.13972.15566452810164919612@ietfa.amsl.com> In-Reply-To: <157290166404.13972.15566452810164919612@ietfa.amsl.com> From: Tony Przygienda Date: Mon, 4 Nov 2019 13:11:19 -0800 Message-ID: To: rift@ietf.org Content-Type: multipart/alternative; boundary="00000000000000ad2b05968bc544" Archived-At: Subject: Re: [Rift] I-D Action: draft-ietf-rift-rift-09.txt X-BeenThere: rift@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Discussion of Routing in Fat Trees List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 04 Nov 2019 21:12:17 -0000 --00000000000000ad2b05968bc544 Content-Type: text/plain; charset="UTF-8" Editorial version snapshot before IETF. Contains lots of input from 3 early DIR reviews. Mostly restructuring (appendices pulled in) and lots of clarifications in the document added as requested by reviewers. Outstanding moving to XML2RFC V3 to include SVG pictures of FSMs, normative language fine-comb and general brush to simplify language and correct for grammar/articles, such stuff ... Will come after IETF --- tony On Mon, Nov 4, 2019 at 1:08 PM wrote: > > A New Internet-Draft is available from the on-line Internet-Drafts > directories. > This draft is a work item of the Routing In Fat Trees WG of the IETF. > > Title : RIFT: Routing in Fat Trees > Authors : Tony Przygienda > Alankar Sharma > Pascal Thubert > Bruno Rijsman > Dmitry Afanasiev > Filename : draft-ietf-rift-rift-09.txt > Pages : 154 > Date : 2019-11-04 > > Abstract: > This document defines a specialized, dynamic routing protocol for > Clos and fat-tree network topologies optimized towards minimization > of configuration and operational complexity. The protocol > > deals with no configuration, fully automated construction of fat- > tree topologies based on detection of links, > > minimizes the amount of routing state held at each level, > > automatically prunes and load balances topology flooding exchanges > over a sufficient subset of links, > > supports automatic disaggregation of prefixes on link and node > failures to prevent black-holing and suboptimal routing, > > allows traffic steering and re-routing policies, > > allows loop-free non-ECMP forwarding, > > automatically re-balances traffic towards the spines based on > bandwidth available and finally > > provides mechanisms to synchronize a limited key-value data-store > that can be used after protocol convergence to e.g. bootstrap > higher levels of functionality on nodes. > > > The IETF datatracker status page for this draft is: > https://datatracker.ietf.org/doc/draft-ietf-rift-rift/ > > There are also htmlized versions available at: > https://tools.ietf.org/html/draft-ietf-rift-rift-09 > https://datatracker.ietf.org/doc/html/draft-ietf-rift-rift-09 > > A diff from the previous version is available at: > https://www.ietf.org/rfcdiff?url2=draft-ietf-rift-rift-09 > > > Please note that it may take a couple of minutes from the time of > submission > until the htmlized version and diff are available at tools.ietf.org. > > Internet-Drafts are also available by anonymous FTP at: > ftp://ftp.ietf.org/internet-drafts/ > > _______________________________________________ > RIFT mailing list > RIFT@ietf.org > https://www.ietf.org/mailman/listinfo/rift > --00000000000000ad2b05968bc544 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Editorial version snapshot before IETF. Contains lots= of input from 3 early DIR reviews. Mostly restructuring (appendices pulled= in) and lots of clarifications in the document added as requested by revie= wers.

Outstanding moving to XML2RFC V3 to include = SVG pictures of FSMs, normative language fine-comb and general brush to sim= plify language and correct for grammar/articles, such stuff ... Will come a= fter IETF

--- tony

On Mon, Nov 4, 2= 019 at 1:08 PM <internet-dra= fts@ietf.org> wrote:

A New Internet-Draft is available from the on-line Internet-Drafts director= ies.
This draft is a work item of the Routing In Fat Trees WG of the IETF.

=C2=A0 =C2=A0 =C2=A0 =C2=A0 Title=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0:= RIFT: Routing in Fat Trees
=C2=A0 =C2=A0 =C2=A0 =C2=A0 Authors=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0: Tony= Przygienda
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 =C2=A0 Alankar Sharma
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 =C2=A0 Pascal Thubert
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 =C2=A0 Bruno Rijsman
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 =C2=A0 Dmitry Afanasiev
=C2=A0 =C2=A0 =C2=A0 =C2=A0 Filename=C2=A0 =C2=A0 =C2=A0 =C2=A0 : draft-iet= f-rift-rift-09.txt
=C2=A0 =C2=A0 =C2=A0 =C2=A0 Pages=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0:= 154
=C2=A0 =C2=A0 =C2=A0 =C2=A0 Date=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 := 2019-11-04

Abstract:
=C2=A0 =C2=A0This document defines a specialized, dynamic routing protocol = for
=C2=A0 =C2=A0Clos and fat-tree network topologies optimized towards minimiz= ation
=C2=A0 =C2=A0of configuration and operational complexity.=C2=A0 The protoco= l

=C2=A0 =C2=A0 =C2=A0 deals with no configuration, fully automated construct= ion of fat-
=C2=A0 =C2=A0 =C2=A0 tree topologies based on detection of links,

=C2=A0 =C2=A0 =C2=A0 minimizes the amount of routing state held at each lev= el,

=C2=A0 =C2=A0 =C2=A0 automatically prunes and load balances topology floodi= ng exchanges
=C2=A0 =C2=A0 =C2=A0 over a sufficient subset of links,

=C2=A0 =C2=A0 =C2=A0 supports automatic disaggregation of prefixes on link = and node
=C2=A0 =C2=A0 =C2=A0 failures to prevent black-holing and suboptimal routin= g,

=C2=A0 =C2=A0 =C2=A0 allows traffic steering and re-routing policies,

=C2=A0 =C2=A0 =C2=A0 allows loop-free non-ECMP forwarding,

=C2=A0 =C2=A0 =C2=A0 automatically re-balances traffic towards the spines b= ased on
=C2=A0 =C2=A0 =C2=A0 bandwidth available and finally

=C2=A0 =C2=A0 =C2=A0 provides mechanisms to synchronize a limited key-value= data-store
=C2=A0 =C2=A0 =C2=A0 that can be used after protocol convergence to e.g.=C2= =A0 bootstrap
=C2=A0 =C2=A0 =C2=A0 higher levels of functionality on nodes.


The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-ri= ft-rift/

There are also htmlized versions available at:
https://tools.ietf.org/html/draft-ietf-rift-rift-= 09
https://datatracker.ietf.org/doc/html/d= raft-ietf-rift-rift-09

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=3Ddraft= -ietf-rift-rift-09


Please note that it may take a couple of minutes from the time of submissio= n
until the htmlized version and diff are available at tools.ietf.org.

Internet-Drafts are also available by anonymous FTP at:
ftp://ftp.ietf.org/internet-drafts/

_______________________________________________
RIFT mailing list
RIFT@ietf.org
https://www.ietf.org/mailman/listinfo/rift
--00000000000000ad2b05968bc544--