On Wed, Jun 17, 2015 at 02:34:52PM +0200, Ladislav Lhotka wrote: > > > On 17 Jun 2015, at 13:51, Juergen Schoenwaelder > > <[email protected]> wrote: > > > > On Wed, Jun 17, 2015 at 01:41:56PM +0200, Ladislav Lhotka wrote: > >> > >> > >> Well, but it is exactly what Kent objected against. It is the requirement > >> to support “old clients” that causes the trouble here (and elsewhere). If > >> client A sets “inactive” somewhere, then the datastore semantics will > >> change also for client B that doesn’t understand “inactive” and may be > >> wondering why the server ignores his edits. > >> > >> I understand (although RFC 6241 doesn’t say it explicitly) that, unlike > >> YANG extensions, a NETCONF capability advertised by the server can be > >> mandatory for the client in the sense that it has to understand and honour > >> it. > > > > There is no way for a client to tell whether a certain capability URI > > (it has never seen before) is mandatory to understand or not. In fact, > > So it means that, e.g. the annotations from > > https://tools.ietf.org/html/draft-kwatsen-conditional-enablement-00 > > cannot be safely used by the server even after advertising them via > :conditional-enablement capability.
Yes, advertisement is not sufficient. > > Without further protocol support to negotiate annotations, I think > > annotations must be limited to things that can be safely ignored by a > > client. I have not read the I-D yet but I would expect that it should > > say something like that. ;-) > > But it’s not a specific problem of this draft, it would simply mean that > annotations that cannot be ignored cannot be used at all, no matter what. > However, some annotations that have been proposed (and probably used in the > wild) are of that sort. > They cannot be used safely until there is an annotation negotiation mechanism, or as Martin indicated, a way for a client to explicitely enable the functionality associated with certain annotations. /js -- Juergen Schoenwaelder Jacobs University Bremen gGmbH Phone: +49 421 200 3587 Campus Ring 1 | 28759 Bremen | Germany Fax: +49 421 200 3103 <http://www.jacobs-university.de/> _______________________________________________ netmod mailing list [email protected] https://www.ietf.org/mailman/listinfo/netmod
