Re: [netmod] a question about 'when'
Ladislav Lhotka <lhotka@nic.cz> Mon, 05 August 2019 09:49 UTC
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From: Ladislav Lhotka <lhotka@nic.cz>
To: "Fengchong (frank)" <frank.fengchong@huawei.com>, "netmod@ietf.org" <netmod@ietf.org>
Cc: "Zhangxiaoping (C)" <zhang.xiaoping@huawei.com>, liuzhiying <liuzhiying@huawei.com>
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Date: Mon, 05 Aug 2019 11:48:52 +0200
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Subject: Re: [netmod] a question about 'when'
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"Fengchong (frank)" <frank.fengchong@huawei.com> writes: > Hi all, > > I encounter a question about 'when', when I implement yang model associated when condition. > > Yang model: > > leaf password-type { > type enumeration { > enum null; > enum simple; > enum cipher; > } > } > > leaf password-text { > type string; > when "../password-type != null"; > } > > I config these two leafs as below: > <password-type>simple</password-type> > <password-text>123456</password-text> > > And I changed password-type to null, I get the config like below: > <password-type>null</password-type> > > And then, I reconfig the password-type to simple, what data should be returned? > > Is > <password-type>simple</password-type> According to RFC 7950, sec. 8.2, the server deleted "password-text" after you changed "password-type" to null but the original value isn't recovered after you change the type back. This server behaviour means that a typo or similar trivial error may have catastrophic consequences such as auto-deletion of entire configuration subtrees. That's why our RESTCONF implementation (jetconf) does something else: it won't permit you to change "password-type" to null as long as the "password-text" exists. Lada > > Or > > <password-type>simple</password-type> > <password-text>123456</password-type> > _______________________________________________ > netmod mailing list > netmod@ietf.org > https://www.ietf.org/mailman/listinfo/netmod -- Ladislav Lhotka Head, CZ.NIC Labs PGP Key ID: 0xB8F92B08A9F76C67
- [netmod] a question about 'when' Fengchong (frank)
- Re: [netmod] a question about 'when' Ladislav Lhotka
- Re: [netmod] a question about 'when' Andy Bierman
- Re: [netmod] a question about 'when' Ladislav Lhotka
- Re: [netmod] a question about 'when' Rob Wilton (rwilton)
- Re: [netmod] a question about 'when' Juergen Schoenwaelder
- Re: [netmod] a question about 'when' Ladislav Lhotka
- Re: [netmod] a question about 'when' Andy Bierman
- Re: [netmod] a question about 'when' Rob Wilton (rwilton)
- Re: [netmod] a question about 'when' Ladislav Lhotka