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

"Reshad Rahman (rrahman)" <rrahman@cisco.com> Sun, 18 February 2018 03:28 UTC

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From: "Reshad Rahman (rrahman)" <rrahman@cisco.com>
To: "Acee Lindem (acee)" <acee@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 03:28:13 +0000
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Subject: Re: [yang-doctors] Yangdoctors last call review of draft-ietf-bfd-yang-09
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Hi Acee,

What I meant is that BFD always augments the control palne protocols in ietf-routing model. And the BFD augmentation can be used as-is or mounted in LNE or in NI.

Regards,
Reshad.

On 2018-02-17, 7:46 PM, "Acee Lindem (acee)" <acee@cisco.com> wrote:

    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/>