Re: [netconf] Capability-fetching mechanisms
Qin Wu <bill.wu@huawei.com> Wed, 12 May 2021 01:51 UTC
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From: Qin Wu <bill.wu@huawei.com>
To: Kent Watsen <kent+ietf@watsen.net>, "netconf@ietf.org" <netconf@ietf.org>
Thread-Topic: [netconf] Capability-fetching mechanisms
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Date: Wed, 12 May 2021 01:51:33 +0000
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Subject: Re: [netconf] Capability-fetching mechanisms
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Hi, Kent: Sorry for late follow up. On Apr 19, 2021, at 5:39 PM, Kent Watsen <kent@watsen.net<mailto:kent@watsen.net>> wrote: Dear WG, One of the outcomes from “https-notif” presentation during the NETCONF 110 session was to what extent all the notif (e.g., https, udp, etc.) drafts should define their own capability-fetching mechanism, or use the mechanism defined by the "data-export-capabilities” draft. As authors, Mahesh and I discussed some of the PROs and CONs of the approaches as follows: [Qin]:I am under impression that shared-mechanism has a lot of benefit.:-) * PROs (for having a shared-mechanism): * Enables a common mechanism spanning multiple notif transports to exist * CONs (against having a shared mechanism): * Entails each receiver also needing to be a NETCONF and/or RESTCONF server [Qin]:Is receiver in this context NETCONF/RESTCONF server or client? I think we mix two things, a. one is the server advertise its capability to the client , (i.e., server capability advertisement) b. the other is server send the capability query request the client and get capability response from the client. (client capability fetching) I think data-export-capabilities right now focuses on (a), the question you ask here is whether (b) can be defined as shared mechanism which can be part of the "data-export-capabilities” draft. If my understanding is correct, I think it will be nice to have (b) such shared mechanism, i.e., Defining (a) and (b) in a single place. * Whereas a notif-specific solution can be optimized on a per-protocol basis. * FWIW, if RC, the receiver COULD minimally support *just* the single GET request (i.e., not a complete RC server) * Still, networking/firewall would have to support the outbound NC/RC flow, in addition to the base notification flow [Qin]: "data-export-capabilities " draft uses draft-ietf-netconf-notification-capabilities-16 as basis or foundation. If my understanding is correct, draft-ietf-netconf- notification-capabilities-16 doesn’t require receiver to support NETCONF or RESTCONF. * Potentially extends the number of capabilities to be more than minimally necessary * e.g., the current "data-export-capabilities” modules define dozens of capabilities supporting RFC 8639 and RFC 8641 that are not needed for https-notif, [Qin] Dozens of capabilities defined by the current "data-export-capabilities” modules are all optional capability. It doesn’t require all the capabilities to be supported. when RFC 8639 is not in use. * HTTPS-Notif seems to need only three capabilities: * What encodings are supported (json, xml, binary) * If the RFC 8639 state machine is supported. * If bundled messages is supported. [Qin]: So HTTPs-notif can pick those three capabilities and ignore other capabilities. I believe HTTP has mechanism to deal with these unhandled capabilities advertised by the network device. One of such example is unhandled Namespace defined in (https://datatracker.ietf.org/doc/html/draft-ietf-regext-unhandled-namespaces-07) * Presumably, UDP-Notif would similarly have a small set of capacities. * In fact, it may be less, as UDP may be unable to support RFC 8639 [Qin]: See clarification above. For UDP notif, it doesn’t require all the capability to be supported. Thoughts? Kent and Mahesh // as authors _______________________________________________ netconf mailing list netconf@ietf.org<mailto:netconf@ietf.org> https://www.ietf.org/mailman/listinfo/netconf
- [netconf] Capability-fetching mechanisms Kent Watsen
- Re: [netconf] Capability-fetching mechanisms Kent Watsen
- Re: [netconf] Capability-fetching mechanisms Qin Wu
- Re: [netconf] Capability-fetching mechanisms Wei Wang
- Re: [netconf] Capability-fetching mechanisms maqiufang (A)
- Re: [netconf] Capability-fetching mechanisms Mahesh Jethanandani
- Re: [netconf] Capability-fetching mechanisms Qin Wu
- Re: [netconf] Capability-fetching mechanisms Mahesh Jethanandani
- Re: [netconf] Capability-fetching mechanisms Kent Watsen
- Re: [netconf] Capability-fetching mechanisms Qin Wu
- Re: [netconf] Capability-fetching mechanisms maqiufang (A)
- Re: [netconf] Capability-fetching mechanisms Mahesh Jethanandani
- Re: [netconf] Capability-fetching mechanisms Kent Watsen
- [netconf] 答复: Capability-fetching mechanisms Qin Wu
- Re: [netconf] Capability-fetching mechanisms Zmail
- Re: [netconf] Capability-fetching mechanisms Qin Wu
- Re: [netconf] Capability-fetching mechanisms maqiufang (A)
- Re: [netconf] Capability-fetching mechanisms Kent Watsen
- Re: [netconf] Capability-fetching mechanisms Qin Wu
- Re: [netconf] Capability-fetching mechanisms Mahesh Jethanandani
- Re: [netconf] Capability-fetching mechanisms maqiufang (A)
- Re: [netconf] Capability-fetching mechanisms Rob Wilton (rwilton)
- Re: [netconf] Capability-fetching mechanisms maqiufang (A)
- Re: [netconf] Capability-fetching mechanisms Kent Watsen
- Re: [netconf] Capability-fetching mechanisms Pierre Francois
- Re: [netconf] Capability-fetching mechanisms Mahesh Jethanandani
- Re: [netconf] Capability-fetching mechanisms Pierre Francois
- Re: [netconf] Capability-fetching mechanisms Mahesh Jethanandani
- Re: [netconf] Capability-fetching mechanisms Pierre Francois
- Re: [netconf] Capability-fetching mechanisms Rob Wilton (rwilton)