Re: [Netconf] Advertisement of imported features
Martin Bjorklund <mbj@tail-f.com> Tue, 08 January 2019 20:17 UTC
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Date: Tue, 08 Jan 2019 21:17:44 +0100
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To: muly_i@rad.com
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From: Martin Bjorklund <mbj@tail-f.com>
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Subject: Re: [Netconf] Advertisement of imported features
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Hi, Muly Ilan <muly_i@rad.com> wrote: > Hi, > > Not sure whether import of features from one module to the other is > fully supported by YANG and NETCONF. > > For example, with these modules: > > module alpha { > namespace "http://example.com/alpha"; > prefix "a"; > > feature a-feature; > > leaf aoo { > if-feature a-feature; > type string; > } > > leaf a2 { > type string; > } > > } > > > module beta { > namespace "http://example.com/beta"; > prefix "b"; > > import alpha { > prefix a; > } > > leaf boo { > if-feature a:a-feature; > type string; > } > > leaf b2 { > type string; > } > > } > > The intension is re-use of the feature "a-feature" in the importing > module "beta". The statement if-feature a:a-feature; means that the boo leaf if valid if the "a-feature" in module "a" is supported in the server. > Now, how should a server advertise the support of "a-feature" in > module "beta"? It doesnt; it should advertise module "alpha" with "a-feature", and "beta" w/o any features. > > 1. YANG 1.0 > According to section 5.6.4 of RFC6020 the NETCONF <hello> message is > used. > So, I assume the <hello> should contain the following: > <capability> > http://example.com/beta?module=beta&features=a:a-feature > </capability> > > Is the above a valid capability? No. It should be: <capability> http://example.com/alhpa?module=alpha&features=a:a-feature </capability> <capability> http://example.com/beta?module=beta </capability> > 2. YANG 1.1 > According to section 5.6.4 of RFC7950 the "ietf-yang-library" defined > in RFC7895 must be implemented. > > The relevant node definition from RFC7895: > > leaf-list feature { > type yang:yang-identifier; > description > "List of all YANG feature names from this module that are > supported by the server, regardless whether they are defined > in the module or any included submodule."; > } > > But the pattern of the typedef "yang:yang-identifier" does not permit > a prefix. > > Can this be fixed in draft-ietf-netconf-rfc7895bis ? As per above, this is not needed. /martin > > > Regards, > > Muly > > > [RAD.jpg] > > Muly Ilan > Senior System Architect > M: +972-54-470-1004 | muly_i@rad.com<mailto:muly_i@rad.com> > T: +972-3-765-7035 | F: +972-3-644-0898 > > www.rad.com<http://www.rad.com> | Follow RAD on > LinkedIn<http://www.linkedin.com/company/7369/> | > Facebook<http://www.facebook.com/pages/RAD-Data-Communications/72479223117> > | Twitter<http://twitter.com/raddatacomms> | > YouTube<http://www.youtube.com/user/radwebmaster#g/u> > > > > > > >
- [Netconf] Advertisement of imported features Muly Ilan
- Re: [Netconf] Advertisement of imported features Martin Bjorklund
- Re: [Netconf] Advertisement of imported features Muly Ilan