Re: I-D Action: draft-ietf-bfd-yang-17.txt

Reshad Rahman <reshad@yahoo.com> Sat, 19 December 2020 15:08 UTC

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Date: Sat, 19 Dec 2020 10:08:30 -0500
Subject: Re: I-D Action: draft-ietf-bfd-yang-17.txt
From: Reshad Rahman <reshad@yahoo.com>
To: tom petch <ietfa@btconnect.com>, Jeffrey Haas <jhaas@pfrc.org>
CC: "rtg-bfd@ietf.org" <rtg-bfd@ietf.org>, "draft-ietf-bfd-yang@ietf.org" <draft-ietf-bfd-yang@ietf.org>, Lynne Bartholomew <lbartholomew@amsl.com>
Message-ID: <189F7452-D997-42D9-A22F-E93A4716E8F3@yahoo.com>
Thread-Topic: I-D Action: draft-ietf-bfd-yang-17.txt
References: <C71CC69E-DAE4-49E0-983A-9B2EE9B4CD46@gmail.com> <D5A12762.2D4DB5%rrahman@cisco.com> <E4E310A2-A79C-403E-B68E-A39B76E2C5E0@gmail.com> <773E4FFC-D66A-49E5-A03A-58B7DBA82D90@gmail.com> <20170731170550.GO24942@pfrc.org> <BAF4C9E6-ED02-4E25-89DD-2FA181AF3B72@gmail.com> <3637B198-8F82-4A85-A4A1-4383AF98088D@pfrc.org> <D26CB257-E4B2-42FA-940E-BF77C8BC1751@gmail.com> <20170801144129.GC24942@pfrc.org> <F319C69C-3A4E-4C5C-ADA4-37BDFD97E91A@gmail.com> <20170801163340.GD24942@pfrc.org> <5F3EA5A8.1050202@btconnect.com> <6D3A9C62-D1FA-4382-B253-9CBC7BEAFD69@cisco.com> <DB7PR07MB534039E99915BC162D4B6CA1A25B0@DB7PR07MB5340.eurprd07.prod.outlook.com> <DC0A86C4-D9F0-4725-A2A8-7FA481A9DE27@cisco.com> <AM6PR07MB5784521D81DBF9D60A5BCF12A2ED0@AM6PR07MB5784.eurprd07.prod.outlook.com> <AM6PR07MB57840A9782624674211C044CA2C20@AM6PR07MB5784.eurprd07.prod.outlook.com>
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Hi,

We have had discussions recently with the RFC Editor wrt changes needed in draft-ietf-bfd-yang. Unfortunately I don't have access to those emails anymore. I don't know whether we can access the latest text in the draft.

Regards,
Reshad.

´╗┐On 2020-12-19, 8:04 AM, "Rtg-bfd on behalf of tom petch" <rtg-bfd-bounces@ietf.org on behalf of ietfa@btconnect.com> wrote:

    From: Rtg-bfd <rtg-bfd-bounces@ietf.org> on behalf of tom petch <ietfa@btconnect.com>
    Sent: 06 November 2020 12:58

    From: Reshad Rahman (rrahman) <rrahman@cisco.com>
    Sent: 21 August 2020 12:31

    On 2020-08-21, 5:57 AM, "tom petch" <ietfa@btconnect.com> wrote:

        From: Reshad Rahman (rrahman) <rrahman@cisco.com>
        Sent: 20 August 2020 18:42

        I had noticed the lsps vs lsps-state, mentioned it at last BFD WG meeting and have been in touch with the teas-yang authors.

        I hadn't noticed that mpls:enabled had been removed. I'll have to go through all MPLS-related items in the BFD yang.

    <tp>
    mpls-base has been approved by the IESG and is wending its way through the system and that is a Normative dependency for bfd-yang so the there might be progress on bfd-yang.  I had a look at the tools pages and MISSREF but do not understand what it is telling me:-(

    <tp2>

    mpls-base is now RFC8960.  As yet I do not see any consequential changes in the I-D in the RFC Editor Q but I am not sure what I should be looking for so I shall keep looking :-)

    Tom Petch


        <tp>
        Yes please; enabled is still there but in a different place; I have not gone back to mpls-base-yang-03 to see if the semantics are the same.

        Note my third rather indecisive comment that mpls-base-yang now models mpls in a different way, splitting IP routes with some MPLS, from MPLS only routes, with no IP, as described in mpls-base-yang-15; I have not got my head around this and do not know how it fits with bfd but suspect that it needs some thinking about.
    <RR> I don't think it has an impact because BFD uses an IP-prefix as MPLS-FEC. But I will take a look.

        I read the meeting minutes but your significant (for me) contribution appears to have passed the minute taker by:-)
    <RR>  It was mentioned in the chairs slides though.

    Regards,
    Reshad.

        Tom Petch



        Regards,
        Reshad.

        On 2020-08-20, 12:33 PM, "t petch" <ietfa@btconnect.com> wrote:

            Yes bfd-yang.  Sometimes I would like to be wrong.

            When I look at this I-D, I see that it references
                 /rt:routing/mpls:mpls/mpls:interface/mpls:config/mpls:enabled
            In 2018, the MPLS WG removed that /config from the mpls-base-yang so
            this would seem to be no longer valid. What needs changing to rectify
            this I have not explored.

            The I-D has
                  augment "/te:te/te:lsps-state/te:lsp"
            which I no longer see in  draft-ietf-teas-yang-te - the -state has gone.
            Again, I have not explored the ramifications of this.

            MPLS WG has a new base-yang out this week which differentiates between
            an IP route with a MPLS next hop and a MPLS route with no IP, the latter
            forming a new, mpls Address Family.  I would think that the latter is
            not catered for by BFD but it would be nice to be wrong

            Tom Petch