Re: [yang-doctors] Yangdoctors last call review of draft-ietf-bfd-yang-09

"Acee Lindem (acee)" <acee@cisco.com> Sun, 18 February 2018 00:46 UTC

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From: "Acee Lindem (acee)" <acee@cisco.com>
To: "Reshad Rahman (rrahman)" <rrahman@cisco.com>, Juergen Schoenwaelder <j.schoenwaelder@jacobs-university.de>
CC: "yang-doctors@ietf.org" <yang-doctors@ietf.org>, "rtg-bfd@ietf.org" <rtg-bfd@ietf.org>, "draft-ietf-bfd-yang.all@ietf.org" <draft-ietf-bfd-yang.all@ietf.org>, "ietf@ietf.org" <ietf@ietf.org>
Thread-Topic: [yang-doctors] Yangdoctors last call review of draft-ietf-bfd-yang-09
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Date: Sun, 18 Feb 2018 00:46:44 +0000
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Subject: Re: [yang-doctors] Yangdoctors last call review of draft-ietf-bfd-yang-09
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Hi Reshad, 
Are you saying that BFD would never augment the list of control place protocols in ietf-routing and always be at the root of the tree (whether it be the device, LNE, or NI)? I guess it doesn't have to be in the list since it will never install routes in the routing table. 

Thanks,
Acee

On 2/17/18, 5:26 PM, "Reshad Rahman (rrahman)" <rrahman@cisco.com> wrote:

    Ietf-bfd augments the ietf-routing model, that's not conditional. How the ietf-bfd model is used may vary:
    1) It may be used "directly" in a device (i.e no schema mount)
    2) It may be schema mounted for use in an LNE
    3) It may be schema mounted for use in a VRF
    
    I thought this was the case for all routing protocols.
    
    Regards,
    Reshad.
    
    On 2018-02-17, 1:31 PM, "Acee Lindem (acee)" <acee@cisco.com> wrote:
    
        I thought about that after I replied. I guess you are saying that it is conceivable for a network device to support ietf-bfd but not support routing (ietf-routing)? 
        
        Thanks,
        Acee 
        
        On 2/17/18, 1:24 PM, "Reshad Rahman (rrahman)" <rrahman@cisco.com> wrote:
        
            Right, schema-mount can be used in some cases (logical device or in a VRF) but doesn’t have to be used in other cases (e.g. network device which doesn't support VRFs). We will clarify the text, at a certain time we incorrectly thought that schema mount had to be used in all cases.
            
            Regards,
            Reshad.
            
            On 2018-02-17, 3:56 AM, "Juergen Schoenwaelder" <j.schoenwaelder@jacobs-university.de> wrote:
            
                On Fri, Feb 16, 2018 at 11:11:28PM +0000, Acee Lindem (acee) wrote:
                
                >     * Design of the Data Model
                >     
                >       - Do I always have to use schema mount to use these YANG models? If
                >         so, one might consider I-D.ietf-netmod-schema-mount a normative
                >         reference. Are you not augmenting the routing model?
                > 
                > This Is definitely not the case. This model will augment RFC8022BIS. The question on how to do is being discussion on the YANG doctors list. 
                >
                
                This is what I thought but the text is kind of misleading:
                
                   BFD can operate in the following contexts:
                
                   [...]
                
                   The approach taken is to do a schema-mount (see Schema Mount
                   [I-D.ietf-netmod-schema-mount]) of the BFD model in the appropriate
                   locations.
                
                /js
                
                -- 
                Juergen Schoenwaelder           Jacobs University Bremen gGmbH
                Phone: +49 421 200 3587         Campus Ring 1 | 28759 Bremen | Germany
                Fax:   +49 421 200 3103         <https://www.jacobs-university.de/>