Re: [Gen-art] Gen-ART Last Call review of draft-ietf-ospf-two-part-metric-05
"Jeffrey (Zhaohui) Zhang" <zzhang@juniper.net> Mon, 08 August 2016 21:27 UTC
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From: "Jeffrey (Zhaohui) Zhang" <zzhang@juniper.net>
To: "Acee Lindem (acee)" <acee@cisco.com>, Brian E Carpenter <brian.e.carpenter@gmail.com>, "draft-ietf-ospf-two-part-metric.all@ietf.org" <draft-ietf-ospf-two-part-metric.all@ietf.org>, General Area Review Team <gen-art@ietf.org>
Thread-Topic: Gen-ART Last Call review of draft-ietf-ospf-two-part-metric-05
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Date: Mon, 08 Aug 2016 21:27:20 +0000
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Archived-At: <https://mailarchive.ietf.org/arch/msg/gen-art/Ob_F6d3_iXa8zGdyFcc-_BEp4aE>
Subject: Re: [Gen-art] Gen-ART Last Call review of draft-ietf-ospf-two-part-metric-05
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Please see -07 version that should address the issues raised by Brian (except that "update" part). https://tools.ietf.org/html/draft-ietf-ospf-two-part-metric-07 Thanks. Jeffrey > -----Original Message----- > From: Acee Lindem (acee) [mailto:acee@cisco.com] > Sent: Monday, August 08, 2016 5:02 PM > To: Brian E Carpenter <brian.e.carpenter@gmail.com>; draft-ietf-ospf-two- > part-metric.all@ietf.org; General Area Review Team <gen-art@ietf.org> > Subject: Re: Gen-ART Last Call review of draft-ietf-ospf-two-part-metric- > 05 > > Hi Brian, > > See one inline. > > On 8/8/16, 4:18 PM, "Brian E Carpenter" <brian.e.carpenter@gmail.com> > wrote: > > >Hi Acee, > > > >Thanks, just a few points in line: > > > >On 09/08/2016 05:47, Acee Lindem (acee) wrote: > >> Hi Brian, > >> > >> Thanks much for the thorough review. Jeffrey and I discussed your > >>comments > >> this morning. See responses to your major/minor comments below. We will > >> incorporate all the nits. > >> > >> On 8/6/16, 9:38 PM, "Brian E Carpenter" <brian.e.carpenter@gmail.com> > >> wrote: > >> > >>> I am the assigned Gen-ART reviewer for this draft. The General Area > >>> Review Team (Gen-ART) reviews all IETF documents being processed > >>> by the IESG for the IETF Chair. Please treat these comments just > >>> like any other last call comments. > >>> > >>> For more information, please see the FAQ at > >>> <http://wiki.tools.ietf.org/area/gen/trac/wiki/GenArtfaq>. > >>> > >>> Document: draft-ietf-ospf-two-part-metric-05.txt > >>> Reviewer: Brian Carpenter > >>> Review Date: 2016-08-07 > >>> IETF LC End Date: 2016-08-15 > >>> IESG Telechat date: > >>> > >>> Summary: Almost ready > >>> -------- > >>> > >>> Major issues: > >>> ------------- > >>> > >>>> Updates: 2328, 5340 (if approved) > >>> > >>> If that is so, the text needs to explain what is changed in those two > >>> RFCs. Since > >>> this draft describes an "optional extension" to OSPF, it does not > >>> obviously update > >>> them. Is any text in those two RFCs made invalid by this draft? > >> > >> This has been an ongoing debate as to whether an RFC the augments an > >> existing draft updates it or whether it must actually change the > >>existing > >> behavior. In this case, the SPF calculation is modified as specified in > >> section 3.6 but only when the new Network-to-Router metric is > >>advertised. > >> In RFC 2328 and RFC 5340, this cost is always zero (i.e., cost to reach > >> all routers connected to the network is solely the outgoing metric > >>metric > >> or Router-to-Network metric). > > > >OK, fair comment. > > > >> > >> I, for one, would be very happy to have consensus of precisely what > >> constitutes update to an existing RFC. > > > >So would many people, and since it affects all RFC streams, not just the > >IETF stream, I happen to know that the RFC Editor is working on > >definitions > >for both "updates" and "obsoletes". > > > >> If we don’t update the existing > >> RFCs, we would avoid the pre-2008 IPR language. > > > >That doesn't seem right. You only need that language if you are updating > >whole chunks of older text. If you take a paragraph from a pre-2008 > >document, > >change a few words, and patch it into the new document, you need either > >the agreement of the original authors or the pre-2008 disclaimer. But I > >don't think you're doing that in this case, are you? > > No. We are simply using the context of the existing SPF calculation to > describe the additional function. > > Thanks, > Acee > > > > > > > >>>> 3.6. SPF Calculation > >>>> > >>>> During the first stage of shortest-path tree calculation for an > >>>>area, > >>>> when a vertex V corresponding to a Network-LSA is added to the > >>>> shortest-path tree and its adjacent vertex W (joined by a link in > >>>>V's > >>>> corresponding Network LSA), the cost from V to W, which is W's > >>>> network-to-router cost, is determined as follows: > >>> > >>> I can't parse that sentence. If we delete the subordinate clauses, we > >>>get > >>> > >>> When a vertex V is added to the shortest-path tree and its adjacent > >>> vertex W, > >>> the cost from V to W is determined as follows: > >>> > >>> What does that mean? What does "its" refer to? Is W adjacent to V, or > >>>is > >>> W adjacent > >>> to the existing tree? Is W added to the tree before V, or is V added > >>> before W? > >>> If I was coding this, I'd have no idea what to do. > >> > >> You really do have to look at RFC 2328 to understand it. > > > >Yes, I did that in some detail when I was teaching routing a few years > >ago ;-) > > > >> Does this > >> modified text parse better? > >> > >> The first stage of the shortest-path tree calculation is described > >> in section 16.1 of [RFC 2328] and modified for OSPFv3 as described > >>in > >> section 4.8.1 of [RFC 5340]. When a vertex V corresponding to a > >> Network-LSA > >> has just been added to the Shortest Path Tree (SPT) and an adjacent > >> vertex W > >> (joined by a link in V’s corresponding Network-LSA) is being added > >>to > >> the SPT, the cost from V to W (W’s network-to-router cost) is > >> determined > >> as follows: > > > >MUCH better. It also clarifies the "Updates:" aspect. > > > >Thanks > > Brian > > > >> > >>> > >>>> 3.7. Backward Compatibility > >>> > >>> This calls for a Router Functional Capability Bit assignment under RFC > >>> 7770. > >>> The bit number should be given as (say) TBD1 not as 0. > >>> > >>>> 4. IANA Considerations > >>> > >>> The IANA considerations ask for four assignments. These should be > >>> specified as TBD1, > >>> TBD2, TBD3, TBD4 and the TBDs elsewhere in the text should be updated > >>> correspondingly. > >>> Also, please reference the relevant RFCs (7770 and whatever defines > the > >>> Sub-TLV registries.) > >> > >> 3.7 and 4 are both fixed in -06 based on comments from Alia. > >> > >>> > >>> Finally, to put this on the standards track, I would really expect to > >>>see > >>> an Implementation Status section (RFC 7942). Has this been tested? > >> > >> The implementation of this stalled. However, it is viewed by the WG as > >> straight-forward enough to advance. > >> > >> > >>> > >>> Minor issues: > >>> ------------- > >>> > >>> Please check the three occurrences of lower-case "must" in Section 3. > >>> Should they be "MUST"? > >>> > >>>> 5. Security Considerations > >>>> > >>>> This document does not introduce new security risks. > >>> > >>> That's easy to say but hard to prove. Shouldn't you at least refer to > >>>the > >>> security > >>> considerations of OSPFv2 and OSPFv3? > >> > >> We will add the reference. > >> > >>> > >>> Also, does section 3.7 introduce a new risk whereby a rogue router > >>>could > >>> flap its > >>> Two-Part Metric bit on and off, causing all its OSPF peers to > >>>continually > >>> recalculate > >>> their routes? > >> > >> This is no more of a risk than other intra-area metric change. > >> > >> Thanks, > >> Jeffrey and Acee > >> > >> > >> > >> > >>> > >>> Nits: > >>> ----- > >>> > >>>> Requirements Language > >>> > >>> It's unusual to put this at the front. The normal place is after the > >>> Introduction. > >>> > >>>> This document may contain material from IETF Documents or IETF > >>>> Contributions published or made publicly available before November > >>>> 10, 2008. ... > >>> > >>> Why is this needed? What did you copy from an old document? > >>> > >>>> 0 OSPF Two-part Metric [TPM] > >>> > >>> The abbreviation TPM is defined but not used, so why bother? Also, > >>> s/[TPM]/(TPM)/ to > >>> avoid confusion with a reference. > >>> > >>>> routes w/o considering any network-to-router costs. > >>> > >>> Just say "without". > >> > >
- Re: [Gen-art] Gen-ART Last Call review of draft-i… Brian E Carpenter
- Re: [Gen-art] Gen-ART Last Call review of draft-i… Acee Lindem (acee)
- Re: [Gen-art] Gen-ART Last Call review of draft-i… Brian E Carpenter
- Re: [Gen-art] Gen-ART Last Call review of draft-i… Jeffrey (Zhaohui) Zhang
- Re: [Gen-art] Gen-ART Last Call review of draft-i… Acee Lindem (acee)
- Re: [Gen-art] Gen-ART Last Call review of draft-i… Brian E Carpenter
- Re: [Gen-art] Gen-ART Last Call review of draft-i… Acee Lindem (acee)
- [Gen-art] Gen-ART Last Call review of draft-ietf-… Brian E Carpenter