Chassis based systems have line cards that support particular interface types. What happens to the output when a line card is plugged in or out of the system? In other words, is this a static or a dynamic list?
> On Apr 6, 2018, at 9:03 AM, Andy Bierman <a...@yumaworks.com> wrote: > > Hi, > > All of these suggested solutions seem OK if one were looking for the most > disruptive > way to solve the problem. Tossing iana-if-types and starting over would > achieve that result. > > First, this is a server capabilities problem, so it is related to the > implementation, not the schema. > > Second, the if-types that are allowed at any given moment can be specific to > the implementation > and the interface name. > > I think this is the 3rd time I have suggested an RPC to solve the actual > probem: > > rpc get-allowed-if-types { > description > "Retrieve the interface types allowed by the server."; > input { > leaf name { > type if:interface-ref; > description > "If present, the server will return allowed interface types for > this interface name only. > If not present, then the server will return all supported > interface types."; > } > } > output { > leaf-list type { > type identityref { > base interface-type; > } > description > "Specifies a supported interface type"; > } > } > } > > > Andy > > > On Fri, Apr 6, 2018 at 6:55 AM, Robert Wilton <rwil...@cisco.com > <mailto:rwil...@cisco.com>> wrote: > At the moment, I would say that the vast majority of the definitions in > IANA.yang are just noise because they refer to definitions that are obsolete. > Our OS seems to use only 10% of the 287+ defined IANA types, and that 10% > includes technologies such as frame relay, serial, atm, that very much seem > to be on their way out. > > Using hierarchical identities and interface properties seems like a > reasonable solution to me (e.g. as described in > draft-wilton-netmod-interface-properties-00). E.g. so rather than having > configuration with a direct when statement on a specific list of interface > types, instead the when statement can depend on the appropriate interface > properties. > > I also like Lada's suggestion of trying to spread out the IANA definitions to > the modules that are defining the technology. So, if a device implements > support for PPP configuration/operational state then it would also naturally > define any PPP related interface identities at the same time. > > If a vendor wants to define their own flavour of Ethernet interface then they > can do so in their vendor specific module without requiring all tooling to > become aware of it, and allowing the existing Ethernet configuration to work > as normal. > > > > On 06/04/2018 13:01, Ladislav Lhotka wrote: > On Fri, 2018-04-06 at 13:36 +0200, Juergen Schoenwaelder wrote: > On Fri, Apr 06, 2018 at 10:51:48AM +0200, Ladislav Lhotka wrote: > Juergen Schoenwaelder <j.schoenwael...@jacobs-university.de > <mailto:j.schoenwael...@jacobs-university.de>> writes: > > If we would have a mechanism to deviate an identityref to a subset of > identity values supported by an implementation, we would have solved a > more generic problem. Yes, the IANA list could be 'nicer' but it will > never be 'nice'. > Three mechanisms can be used for this: > > - splitting the identities into separate modules > Whatever module organization you come up with, it won't work for all > implementations. > Yes, getting the root of this structure right is perhaps somewhat tricky, but > I don't think that it needs to be all encompassing, or perfect. > > - using features > Making every identity a feature will turn the feature system upside > down. This is similar to making every leaf a feature. > > - using deviations (even though vendors frown on them) > If my implementation only supports A and B and C, then a deviation may > state exactly that and the problem is solved. Hoping that my specific > In fact, deviations cannot delete identity values because they aren't schema > nodes, so they are of no use. > > combination of A and B and C matches a set of modules or some set of > features is in my view an illusion. > An implementation that supports, say, a given type of tunnel interface will > implement the module that covers this tunnel type. If the identity for this > tunnel interface type is defined in the same module, then all is good. I don't > get why this should be an illusion. On the contrary, I think it is the > cleanest > available solution to this conformance specification problem. > > Vendors not shipping proper deviations are essentially telling their > customers that they have not yet understood model driven management. > We need to change the mindset here instead of polluting our data > models with hundreds or thousands of fine grained 'features'. > I agree that zillions of features aren't nice but it seems to be the only > solution that we currently have for modules of the iana-if-type style. > > Having an bulky set of identity values, most of which are of no interest, is > IMO > much worse and could also be a security issue if implementors aren't careful > enough. > I'm not sure there is a security concern here, but a long list where most of > the values are cruft doesn't really seem to help anyone. It also makes it > harder to know which is the right type to use. E.g. will everyone know that > they should use "ethernetCsmacd" rather than "gigabitEthernet" for an optical > GE interface that doesn't actually use CSMA/CD ... > > Thanks, > Rob > > > > Lada > > /js > > > _______________________________________________ > netmod mailing list > netmod@ietf.org <mailto:netmod@ietf.org> > https://www.ietf.org/mailman/listinfo/netmod > <https://www.ietf.org/mailman/listinfo/netmod> > > _______________________________________________ > netmod mailing list > netmod@ietf.org > https://www.ietf.org/mailman/listinfo/netmod Mahesh Jethanandani mjethanand...@gmail.com
_______________________________________________ netmod mailing list netmod@ietf.org https://www.ietf.org/mailman/listinfo/netmod