The <get> operation has limitations. Data elements with the same key can be different in <running> and <operational> and merging them together simply does not work. The workaround is to duplicate data models or to move to NMDA. NMDA may seem initially costly but is getting cheaper the larger your collection of data models grows.
/js On Fri, Jun 28, 2019 at 09:07:12AM +0000, Fengchong (frank) wrote: > Should we change the definition of get operation? Like this, get operation > can retrieve all running operational data including running configuration, > system configuration. > Otherwise, we have no way to get the information of system-controlled data > according a NMDA-style YANG module(because has no config false copy ) unless > we implement NMDA. > -----邮件原件----- > 发件人: Juergen Schoenwaelder [mailto:j.schoenwael...@jacobs-university.de] > 发送时间: 2019年6月28日 16:50 > 收件人: Rob Wilton (rwilton) <rwil...@cisco.com> > 抄送: Fengchong (frank) <frank.fengch...@huawei.com>; netc...@ietf.org; > netmod@ietf.org; Zhangwei (SS) <zhangwe...@huawei.com> > 主题: Re: [netmod] pls clarify get operation > > Yes, both the NETCONF <get> operation and the RESTCONF GET on the unified > view of the underlying datastores have limitations and a solution in > situations where these limitations hurt is to move towards NMDA. > > /js > > On Fri, Jun 28, 2019 at 08:38:38AM +0000, Rob Wilton (rwilton) wrote: > > Hi Frank, > > > > Pre NMDA: > > > > * You have a the <running> datastore, along with some others like > > <candidate> and <startup> that you can ignore for the purposes of this > > discussion. > > * The <running> datastore can only contains data for schema nodes that > > are marked as “config true” in YANG (i.e. “rw” in your tree output below). > > * The system may also have some operational state data that is marked > > as “config false” in YANG (i.e. “ro” in your tree output below). > > > > The NETCONF <get-config> operation returns the contents of the <running> > > datastore. > > The NETCONF <get> operation returns the contents of the <running> datastore > > combined with all the operational state as well. Filters can be applied to > > return a subset of the data. > > > > Regarding your question about user created configuration vs system created > > configuration, it depends on whether the devices instantiates the > > configuration in <running> or not. If it does, then it would be returned > > in <get> and <get-config> operations. If it doesn’t then it would not. > > Different vendors/devices will likely implement this in different ways. > > > > Generally, I think that <running> should only contain the configuration > > explicitly configured by the operator’s systems. But this means that there > > isn’t a clean way to represent system created configuration or applied > > configuration, unless you make a config false copy of every config true > > node in YANG. This is approach that was taken by the original IETF YANG > > models (e.g. RFC 7223) before they were superseded by NMDA, and also the > > OpenConfig YANG models (but using a different structure – which also > > struggles to cleanly represent system created configuration data). > > > > The NMDA architecture was written to solve this problem in a clean way > > without requiring duplication in the YANG data models. > > > > Hopefully this helps clarify. > > > > Thanks, > > Rob > > > > > > From: netmod <netmod-boun...@ietf.org> On Behalf Of Fengchong (frank) > > Sent: 28 June 2019 04:29 > > To: netc...@ietf.org; netmod@ietf.org > > Cc: Zhangwei (SS) <zhangwe...@huawei.com> > > Subject: [netmod] 答复: pls clarify get operation > > > > Hi all, > > > > Pls clarify this question. I have been confused for a long time. > > > > ________________________________ > > 华为技术有限公司 Huawei Technologies Co., Ltd. > > [Company_logo] > > 个人签名：冯冲 > > 手 机：13776612983 > > 电子邮件：frank.fengch...@huawei.com<mailto:frank.fengch...@huawei.com> > > 公司网址：www.huawei.com<http://www.huawei.com> > > ________________________________ > > 本邮件及其附件含有华为公司的保密信息，仅限于发送给上面地址中列出的个人或群组。禁 > > 止任何其他人以任何形式使用（包括但不限于全部或部分地泄露、复制、或散发）本邮件中 > > 的信息。如果您错收了本邮件，请您立即电话或邮件通知发件人并删除本邮件！ > > This e-mail and its attachments contain confidential information from > > HUAWEI, which is intended only for the person or entity whose address > > is listed above. Any use of the information contained herein in any > > way (including, but not limited to, total or partial disclosure, > > reproduction, or dissemination) by persons other than the intended > > recipient(s) is prohibited. If you receive this e-mail in error, > > please notify the sender by phone or email immediately and delete it! > > > > 发件人: Fengchong (frank) > > 发送时间: 2019年6月27日 9:59 > > 收件人: 'netc...@ietf.org' <netc...@ietf.org<mailto:netc...@ietf.org>>; > > netmod@ietf.org<mailto:netmod@ietf.org> > > 抄送: Yangshouchuan > > <yangshouch...@huawei.com<mailto:yangshouch...@huawei.com>>; Zhangwei > > (SS) <zhangwe...@huawei.com<mailto:zhangwe...@huawei.com>> > > 主题: pls clarify get operation > > > > Hi all, > > In RFC6241, get operation is defined as: > > 7.7<https://tools.ietf.org/html/rfc6241#section-7.7>. <get> > > > > Description: Retrieve running configuration and device state > > > > information. > > This description is too simply, so I think it should be clarified. > > > > The case is: a data node modelled by one yang can be configured by user, > > but also can be created/modified by system or other protocols. If client > > issues get operation to retrieve this node, > > The data is created/modified by system or other protocols SHOULD > > be returned? > > For example: > > Rib can be configured by user and also can be created by routing > > protocols. In RFC 8349, the rib list is defined as: > > > > > > > > +--rw ribs > > > > +--rw rib* [name] > > > > +--rw name string > > > > +--rw address-family? identityref > > > > +--ro default-rib? boolean {multiple-ribs}? > > > > +--ro routes > > > > | +--ro route* > > > > | ... > > > > +---x active-route > > > > | +---w input > > > > | | +---w v4ur:destination-address? inet:ipv4-address > > > > | | +---w v6ur:destination-address? inet:ipv6-address > > > > | +--ro output > > > > | ... > > > > +--rw description? string > > > > > > > > If client issued get operation to retrieve ribs from non-NMDA > > device, rib instance created by routing protocols should be returned? > > > > Another associated question: If client issued get-config operation > > from non-NMDA device, only user-controlled rib instance should be returned? > > > > > > > _______________________________________________ > > netmod mailing list > > netmod@ietf.org > > https://www.ietf.org/mailman/listinfo/netmod > > > -- > Juergen Schoenwaelder Jacobs University Bremen gGmbH > Phone: +49 421 200 3587 Campus Ring 1 | 28759 Bremen | Germany > Fax: +49 421 200 3103 <https://www.jacobs-university.de/> -- Juergen Schoenwaelder Jacobs University Bremen gGmbH Phone: +49 421 200 3587 Campus Ring 1 | 28759 Bremen | Germany Fax: +49 421 200 3103 <https://www.jacobs-university.de/> _______________________________________________ netmod mailing list netmod@ietf.org https://www.ietf.org/mailman/listinfo/netmod
