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

"Reshad Rahman (rrahman)" <rrahman@cisco.com> Fri, 21 August 2020 11:32 UTC

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From: "Reshad Rahman (rrahman)" <rrahman@cisco.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>
Subject: Re: I-D Action: draft-ietf-bfd-yang-17.txt
Thread-Topic: I-D Action: draft-ietf-bfd-yang-17.txt
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Date: Fri, 21 Aug 2020 11:31:56 +0000
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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>
    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        this would seem to be no longer valid.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