Hi, Mahesh Jethanandani <mjethanand...@gmail.com> wrote: > The network-instances YANG model [RFC8529] gives an example in > Appendix A.1 <https://tools.ietf.org/html/rfc8529#appendix-A.1> of how > to use schema mount to mount the routing protocol. An example modeled > along those lines for the BGP YANG model, and enclosed herewith fails > validation using yanglint with the following error. What am I doing > wrong? > > Validating yang/example-bgp-configuration-a.1.3.xml > err : Unknown element > "routing". > (/ietf-network-instance:network-instances/network-instance[name='vrf-red']/vrf-root) > failed (error code: 0) > > With confdc it fails as follows: > > Loading Data for example a.1.3 > confd_load: 666: maapi_load_config(sock, tid, flags, abspath(argv[0])) > failed: external error (19): Error on line 9: unknown element: routing > in > /ni:network-instances/ni:network-instance[ni:name='vrf-red']/ni:vrf-root/rt:routing > > If what I have is not an error, it raises two questions. Is schema > mount supported? Supported from a validation perspective. I can > imagine that not everyone (or anyone) may have actually implemented > schema mount.
Schema mount is (i) a generic mechanism for composing models at specific mount points and (ii) a way for a server to report to clients how this composition is done in the specific server (this may vary dynamically over time). The network-instance model is generic; it just defines a mount point in the data model. A specific server might be implemented to mount the "ietf-routing" model under the mount point, and in that case it will be able to validate the instance document you provided. However, a generic YANG validator tool does not know (*) which models are supposed to be mounted under any given mount point, and thus it will probably raise an error (as you saw). (*) unless you also pass it additional information about this in some way (this could e.g. in the form of an instance document that contains the /schema-mounts subtree and the ietf-yang-library contents for the mount point) As for implmentation support, we have implemented YANG schema mount in NSO. > And the second and more important question is how are routing > protocols supposed to support VRF if the two models, network instance > and routing protocol, do not work together? What needs to change to > get them to work? I think they do work together! /martin _______________________________________________ netmod mailing list netmod@ietf.org https://www.ietf.org/mailman/listinfo/netmod
