Re: [yang-doctors] How to restrict to have single control-plane-protocol instance
"Acee Lindem (acee)" <acee@cisco.com> Thu, 08 February 2018 11:09 UTC
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From: "Acee Lindem (acee)" <acee@cisco.com>
To: Ladislav Lhotka <lhotka@nic.cz>, Martin Bjorklund <mbj@tail-f.com>, "Reshad Rahman (rrahman)" <rrahman@cisco.com>
CC: "yang-doctors@ietf.org" <yang-doctors@ietf.org>, "zhang.zheng@zte.com.cn" <zhang.zheng@zte.com.cn>, "Xufeng_Liu@jabil.com" <Xufeng_Liu@jabil.com>
Thread-Topic: [yang-doctors] How to restrict to have single control-plane-protocol instance
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Date: Thu, 08 Feb 2018 11:08:53 +0000
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Subject: Re: [yang-doctors] How to restrict to have single control-plane-protocol instance
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Hi Lada, On 2/8/18, 4:42 AM, "yang-doctors on behalf of Ladislav Lhotka" <yang-doctors-bounces@ietf.org on behalf of lhotka@nic.cz> wrote: On Thu, 2018-02-08 at 09:20 +0100, Martin Bjorklund wrote: > Hi, > > "Reshad Rahman (rrahman)" <rrahman@cisco.com> wrote: > > Hi YDs, > > > > MSDP YANG authors want to enforce single-instance of MSDP > > control-plane protocol. The when “rt:type = ‘msdp’“ allows multiple > > control-pane-protocol instances as long as they have different > > rt:name. The only workaround I thought of is to have a when statement > > on the name in the top level container. This would still multiple > > control-plane-protocol instance of type msdp but restricts the name to > > a fixed name (msdp-protocol in this case) for the top level msdp > > container to exist. Any suggestions on how to do this better? > > Hard-coding a name like this is IMO a bad idea. > > Better would be to simply state in text that there MUST only be one > instance of this type. > > But you can also add a must statement that enforces this: > > augment "/rt:routing/rt:control-plane-protocols/" > + "rt:control-plane-protocol" { > when 'derived-from-or-self(rt:type, "msdp:msdp"' { > container msdp { > must 'count(/rt:routing/rt:control-plane-protocols/' > + ' rt:control-plane-protocol[' > + ' derived-from-or-sel(../rt:type, "msdp:msdp")]) <= 1'"; > > > In general, you should be careful with the usage of "count", since it > will loop through *all* instances in the list every time. If the list > is big, this can have a performance impact. Instead of count(), it is possible to use the so-called Muenchian method: container msdp { must "not(../preceding-sibling::rt:control-plane-protocol[" + "derived-from-or-self(rt:type, 'msdp:msdp')])"; .. } It basically states that the control-plane-protocol containing the "msdp" container must not be preceded with a control-plane-protocol entry of the msdp:msdp type (or derived). This looks like an elegant solution. However, since the key for the control-plane-protocol list is "type name", won't it only work if the previous sibling has a "name" that is precedes the one being added? Thanks, Acee Lada > > Also note that I use derived-from-or-self instead of equality for the > identity. > > > /martin > > > > > > Regards, > > Reshad. > > > > augment "/rt:routing/rt:control-plane-protocols/" > > + "rt:control-plane-protocol" { > > when "rt:type = ‘msdp’" { > > description > > "….”; > > } > > description "…."; > > > > container msdp { > > when "../rt:name = ‘msdp-protocol’" { > > description > > "…."; > > } > > description "MSDP top level container."; > > > > > > From: "Reshad Rahman (rrahman)" <rrahman@cisco.com> > > Date: Monday, February 5, 2018 at 6:25 PM > > To: Xufeng Liu <Xufeng_Liu@jabil.com>, "zhang.zheng@zte.com.cn" > > <zhang.zheng@zte.com.cn> > > Cc: "anish.ietf@gmail.com" <anish.ietf@gmail.com>, "Mahesh Sivakumar > > (masivaku)" <masivaku@cisco.com>, "guofeng@huawei.com" > > <guofeng@huawei.com>, "pete.mcallister@metaswitch.com" > > <pete.mcallister@metaswitch.com>, "liuyisong@huawei.com" > > <liuyisong@huawei.com>, "xu.benchong@zte.com.cn" > > <xu.benchong@zte.com.cn>, "tanmoy.kundu@alcatel-lucent.com" > > <tanmoy.kundu@alcatel-lucent.com>, "zzhang_ietf@hotmail.com" > > <zzhang_ietf@hotmail.com>, "Acee Lindem (acee)" <acee@cisco.com> > > Subject: Re: Hi all, about the modification of MSDP YANG > > > > Hi Sandy and Xufeng, > > > > I understand that you want only 1 MSDP instance but I don’t think that > > justifies /rt:routing/rt:control-plane-protocols. If we do that we > > will end up with all single-instance protocols under > > /rt:routing/rt:control-plane-protocols and all the multi-instance ones > > under > > /rt:routing/rt:control-plane-protocols/rt:control-plane-protocol. > > > > I am not sure what’s the best way to enforce single-instance, I can > > check with the other YDs on this topic. One way it can be done is as > > follows (I’ve added the when statement in bold to existing BFD model), > > it enforces that the protocol name is ‘bfdv1’. So multiple instances > > with rt:type=bfd-types:bfdv1 could be created, but only one of these > > instances can have the bfd container. This is probably not the best > > way but the point is that IMO protocols have to go under > > /rt:routing/rt:control-plane-protocols/rt:control-plane-protocol. > > > > Regards, > > Reshad. > > > > augment "/rt:routing/rt:control-plane-protocols/" > > + "rt:control-plane-protocol" { > > when "rt:type = 'bfd-types:bfdv1'" { > > description > > "This augmentation is only valid for a control-plane protocol > > instance of BFD (type 'bfdv1')."; > > } > > description "BFD augmentation."; > > > > container bfd { > > when "../rt:name = 'bfdv1'" { > > description > > "This augmentation is only valid for a control-plane protocol > > instance of BFD (type 'bfdv1')."; > > } > > description "BFD top level container."; > > > > From: Xufeng Liu <Xufeng_Liu@jabil.com> > > Date: Monday, February 5, 2018 at 9:38 AM > > To: "zhang.zheng@zte.com.cn" <zhang.zheng@zte.com.cn> > > Cc: "Reshad Rahman (rrahman)" <rrahman@cisco.com>, > > "anish.ietf@gmail.com" <anish.ietf@gmail.com>, "Mahesh Sivakumar > > (masivaku)" <masivaku@cisco.com>, "guofeng@huawei.com" > > <guofeng@huawei.com>, "pete.mcallister@metaswitch.com" > > <pete.mcallister@metaswitch.com>, "liuyisong@huawei.com" > > <liuyisong@huawei.com>, "xu.benchong@zte.com.cn" > > <xu.benchong@zte.com.cn>, "tanmoy.kundu@alcatel-lucent.com" > > <tanmoy.kundu@alcatel-lucent.com>, "zzhang_ietf@hotmail.com" > > <zzhang_ietf@hotmail.com> > > Subject: RE: Hi all, about the modification of MSDP YANG > > > > Hi Sandy, > > > > Thanks for the updates. > > > > In RFC8022bis, the rt:type is defined under > > /rt:routing/rt:control-plane-protocols/rt:control-plane-protocol. If > > we augment /rt:routing/rt:control-plane-protocols, the “when” > > statement will not be valid, because it cannot find the rt:type. I > > don’t think that we need the “when” statement. The container with > > “presence” will serve the purpose of the identity. We can simply take > > out the “when” statement and the definition of the MSDP identity. > > > > Thanks, > > - Xufeng > > > > From: zhang.zheng@zte.com.cn [mailto:zhang.zheng@zte.com.cn] > > Sent: Monday, February 5, 2018 3:36 AM > > To: Xufeng Liu <Xufeng_Liu@jabil.com> > > Cc: rrahman@cisco.com; anish.ietf@gmail.com; masivaku@cisco.com; > > guofeng@huawei.com; pete.mcallister@metaswitch.com; > > liuyisong@huawei.com; xu.benchong@zte.com.cn; > > tanmoy.kundu@alcatel-lucent.com; zzhang_ietf@hotmail.com > > Subject: RE: Hi all, about the modification of MSDP YANG > > > > > > Hi Xufeng and Reshad, > > > > > > > > I am sorry for forgetting the point. I updated the YANG model. > > > > If no one has comments on it I'd like to submit the new version. :-) > > > > > > > > Thanks, > > > > Sandy > > 原始邮件 > > 发件人: <Xufeng_Liu@jabil.com<mailto:Xufeng_Liu@jabil.com>>; > > 收件人: <rrahman@cisco.com<mailto:rrahman@cisco.com>>;张征00007940; > > <anish.ietf@gmail.com<mailto:anish.ietf@gmail.com>>; > > <masivaku@cisco.com<mailto:masivaku@cisco.com>>; > > <guofeng@huawei.com<mailto:guofeng@huawei.com>>; > > <pete.mcallister@metaswitch.com<mailto:pete.mcallister@metaswitch.com>>; > > <liuyisong@huawei.com<mailto:liuyisong@huawei.com>>;徐本崇10065053; > > <tanmoy.kundu@alcatel-lucent.com<mailto:tanmoy.kundu@alcatel-lucent.com>>; > > <zzhang_ietf@hotmail.com<mailto:zzhang_ietf@hotmail.com>>; > > 日 期 :2018年02月03日 01:21 > > 主 题 :RE: Hi all, about the modification of MSDP YANG > > Hi Sandy and Reshad, > > > > The reason that we used to augment > > /rt:routing/rt:control-plane-protocols, instead of > > /rt:routing/rt:control-plane-protocols/rt:control-plane-protocol, is > > that we do not allow multiple instances of MSDP. > > > > Thanks, > > - Xufeng > > > > From: Reshad Rahman (rrahman) [mailto:rrahman@cisco.com] > > Sent: Friday, February 2, 2018 12:08 PM > > To: zhang.zheng@zte.com.cn<mailto:zhang.zheng@zte.com.cn>; Xufeng Liu > > <Xufeng_Liu@jabil.com<mailto:Xufeng_Liu@jabil.com>>; > > anish.ietf@gmail.com<mailto:anish.ietf@gmail.com>; Mahesh Sivakumar > > (masivaku) <masivaku@cisco.com<mailto:masivaku@cisco.com>>; > > guofeng@huawei.com<mailto:guofeng@huawei.com>; > > pete.mcallister@metaswitch.com<mailto:pete.mcallister@metaswitch.com>; > > liuyisong@huawei.com<mailto:liuyisong@huawei.com>; > > xu.benchong@zte.com.cn<mailto:xu.benchong@zte.com.cn>; > > tanmoy.kundu@alcatel-lucent.com<mailto:tanmoy.kundu@alcatel-lucent.com>; > > zzhang_ietf@hotmail.com<mailto:zzhang_ietf@hotmail.com> > > Subject: Re: Hi all, about the modification of MSDP YANG > > > > Hi Sandy, > > > > I don’t know what warning you are getting now but from a quick look at > > the revision you sent I see couple of issues. > > > > identity msdp { > > base "rt:routing-protocol"; <== should be rt:control-plane-protocol > > description "MSDP"; > > } > > <snip> > > /* > > * Data nodes > > */ > > augment > > "/rt:routing/rt:control-plane-protocols/rt:control-plane-protocol" { > > when "rt:type = 'MSDP'" { <== should be "rt:type = 'msdp:msdp'" > > > > > > HTH, > > Reshad. > > > > From: "zhang.zheng@zte.com.cn<mailto:zhang.zheng@zte.com.cn>" > > <zhang.zheng@zte.com.cn<mailto:zhang.zheng@zte.com.cn>> > > Date: Friday, February 2, 2018 at 4:37 AM > > To: "xufeng_liu@jabil.com<mailto:xufeng_liu@jabil.com>" > > <xufeng_liu@jabil.com<mailto:xufeng_liu@jabil.com>>, > > "anish.ietf@gmail.com<mailto:anish.ietf@gmail.com>" > > <anish.ietf@gmail.com<mailto:anish.ietf@gmail.com>>, "Mahesh Sivakumar > > (masivaku)" <masivaku@cisco.com<mailto:masivaku@cisco.com>>, > > "guofeng@huawei.com<mailto:guofeng@huawei.com>" > > <guofeng@huawei.com<mailto:guofeng@huawei.com>>, > > "pete.mcallister@metaswitch.com<mailto:pete.mcallister@metaswitch.com>" > > <pete.mcallister@metaswitch.com<mailto:pete.mcallister@metaswitch.com>>, > > "liuyisong@huawei.com<mailto:liuyisong@huawei.com>" > > <liuyisong@huawei.com<mailto:liuyisong@huawei.com>>, > > "xu.benchong@zte.com.cn<mailto:xu.benchong@zte.com.cn>" > > <xu.benchong@zte.com.cn<mailto:xu.benchong@zte.com.cn>>, > > "tanmoy.kundu@alcatel-lucent.com<mailto:tanmoy.kundu@alcatel-lucent.com>" > > <tanmoy.kundu@alcatel-lucent.com<mailto:tanmoy.kundu@alcatel-lucent.com>>, > > "zzhang_ietf@hotmail.com<mailto:zzhang_ietf@hotmail.com>" > > <zzhang_ietf@hotmail.com<mailto:zzhang_ietf@hotmail.com>> > > Cc: "Reshad Rahman (rrahman)" > > <rrahman@cisco.com<mailto:rrahman@cisco.com>> > > Subject: FW: Hi all, about the modification of MSDP YANG > > > > > > Hi all, > > > > > > > > I deleted some groupings and make the model more clear. > > > > And I updated the decription of (peer-as, up-time, expire). Please > > review it. > > > > > > > > A warning is still existing about rt:type: > > > > 5, - augment of control-plane-protocols is incorrect. There should be > > an identity msdp with > > > > base "rt:routing-protocol" and then augment > > > > "/rt:routing/rt:control-plane-protocols/rt:control-plane-protocol" > > with a when > > > > statement. Take a look at OSPF YANG for an example. > > > > [Sandy]: Added the identity and modify the augmentation, but it seems > > like there is no MSDP register in rt:type. > > > > How can we register it? > > > > > > > > Thanks, > > > > Sandy > > 原始邮件 > > 发件人:张征00007940 > > 收件人: <xufeng_liu@jabil.com<mailto:xufeng_liu@jabil.com>>; > > <anish.ietf@gmail.com<mailto:anish.ietf@gmail.com>>; > > <masivaku@cisco.com<mailto:masivaku@cisco.com>>; > > <guofeng@huawei.com<mailto:guofeng@huawei.com>>; > > <pete.mcallister@metaswitch.com<mailto:pete.mcallister@metaswitch.com>>; > > <liuyisong@huawei.com<mailto:liuyisong@huawei.com>>;徐本崇10065053; > > <tanmoy.kundu@alcatel-lucent.com<mailto:tanmoy.kundu@alcatel-lucent.com>>; > > <zzhang_ietf@hotmail.com<mailto:zzhang_ietf@hotmail.com>>; > > 抄送人: <rrahman@cisco.com<mailto:rrahman@cisco.com>>; > > 日 期 :2018年01月29日 17:04 > > 主 题 :Hi all, about the modification of MSDP YANG > > > > Hi all, > > > > > > > > YANG doctor Reshad had finished the early review about MSDP YANG. > > > > I finished the preliminary modification version, please review it. > > > > I think some advices from Reshad should be discussed: > > > > > > > > 1, - Not sure why peer-as is needed. Don't see it in RFC3618. > > > > 2, - leaf up-time, what's meant by "up time" in the description? Is it > > time it's > > > > been created? > > > > 3, - description for leaf expire seems wrong. > > > > [Sandy]: These items (peer-as, up-time, expire) doesn't existed in > > RFC3618, are these unnecessary? Please write down your > > > > description if you insist on it. If nobody insist on it, should we > > delete them? > > > > > > > > 4, - Groupings are used for data which is used only once. Is this done > > on purpose or > > > > was the intention to use those groupings more than once? > > > > [Sandy]: These eight groupings are used only once, should we change > > them to container? > > > > authentication-container; > > > > global-config-attributes; > > > > peer-config-attributes; > > > > peer-state-attributes; > > > > sa-cache-state-attributes; > > > > statistics-container > > > > statistics-error > > > > statistics-queue > > > > > > > > 5, - augment of control-plane-protocols is incorrect. There should be > > an identity msdp with > > > > base "rt:routing-protocol" and then augment > > > > "/rt:routing/rt:control-plane-protocols/rt:control-plane-protocol" > > with a when > > > > statement. Take a look at OSPF YANG for an example. > > > > [Sandy]: Added the identity and modify the augmentation, but it seems > > like there is no MSDP register in rt:type. > > > > How can we register it? > > > > > > > > > > > > Most of the suggestion is adopted. The modification detail pls see > > below: > > > > > > > > - Too many features (17)! Every piece of config has an if-feature > > - statement. > > > > Some of the configs (timers?) should be part of most/basic > > implementations, for > > > > other config (e.g. authentication) I can see why a feature would be > > used. > > > > [Sandy]: Modified the three timers (connect-retry, hold, keepalive) to > > fixed format. > > > > > > > > -“import ietf-yang-types” should have a reference to RFC6991 (see > > -section 4.7 of > > > > rfc6087bis-15) > > > > - “import ietf-inet-types” should have a reference to RFC6991 > > > > - “import ietf-routing” should have a reference to RFC8022 > > > > - “import ietf-interfaces” should have a reference to RFC7223 > > > > - "import ietf-ip" should have a reference to RFC7277 > > > > - "import ietf-key-chain" should have a reference to RFC8177 > > > > [Sandy]: Added all the references above. > > > > > > > > - organization s/"...PIM( Protocols for IP Multicast ) Working > > > > Group"/"...PIM (Protocols for IP Multicast) Working Group"? > > > > - Remove WG Chairs from contact information as per Appendix C of > > - rfc6087bis-15 > > > > - No copyright in the module description, see Appendix of 6087bis-15 for > > - a module description > > > > example > > > > - Module description must contain reference to RFC, see Appendix C of > > > > rfc6087bis-15 > > > > [Sandy]: Removed WG chairs and add copyright from Appendix of > > rfc6087bis. Added reference to RFC3618. > > > > > > > > - grouping authentication-container. key-chain and password both > > > > use if-feature peer-key-chain. > > > > [Sandy]: Removed the if-feature peer-key-chain from password. > > > > > > > > - grouping connect-source. The name is not very > > > > descriptive. Should this be something along the lines of > > tcp-connection-source? > > > > [Sandy]: Changed the name "connect-source" to "tcp-connection-source". > > > > > > > > - grouping global-state-attributes has nothing > > > > [Sandy]: Deleted the grouping. > > > > > > > > - Some of the descriptions are > > > > pretty terse. e.g. for rpf-peer it says "RPF peer.". In a case like > > this > > > > consider adding more descriptive text or a reference to the proper > > section in > > > > RFC3618 > > > > [Sandy]: Added more description. > > > > > > > > - peer-as (Autonomous System Number) is defined as type string, should > > > > be of type as-number in ietf-inet-types? > > > > [Sandy]: Modified to inet types. > > > > > > > > - keepalive-interval depends on holdtime-interval. > > > > There should be "if-feature peer-timer-holdtime" under leaf > > keepalive-interval > > > > or change the must statement to (assuming we keep the 2 features): > > > > must "(not ../holdtime-interval) or (. > 1 and . < > > ../holdtime-interval)". > > > > [Sandy]: Modified the features to fixed format. > > > > > > > > - leaf up-time: s/sa cache/SA cache/ > > > > - leaf peer-learned-from, change description from "The address of peer > > - that we learned > > > > this SA from ." to "The address of the peer that we learned this SA > > from." > > > > [Sandy]: Modified. > > > > > > > > - RPC leaf group, I thought we had a type for IP multicast address? If > > - not, it should be done? > > > > [Sandy]: Yes. Added the rt-type reference to RFC8294. > > > > > > > > - s/msdp/MSDP/ > > > > - In rpc msdp-clear-peer, s/Clears the session to the peer./Clears > > > > the TCP connection to the peer./ > > > > - In rpc msdp-clear-sa-cache, why have the enum '*' for > > - source-addr. Can't the same technique as for peer-address be > > > > > > > > used? > > > > - msdp prefix not needed in rpc names > > > > [Sandy]: Done. > > > > > > > > - MSDP peers are configured in a mesh-group, did the authors consider > > - adding state per mesh-group, e.g. all the > > > > peers in a particular mesh-group? > > > > [Sandy]: IMO it is unnecessary because the states of peers is not > > unified in a mesh-group. > > > > > > > > General: > > > > - Per Appendix B of rfc6087bis-15: "that all YANG modules containing > > > > imported items are cited as normative reference". So RFCs 6991, 7223, > > > > 7277, 8022 and 8177 should be included in the normative reference > > > > section. > > > > [Sandy]: Added. > > > > > > > > - Section 3 "the irrelevant information", add a reference/explanation > > - for what > > > > the irrelevant information is. s/the irrelevant information/irrelevant > > > > information/? > > > > [Sandy]: Changed the description. > > > > > > > > - Section 5 should give a brief description of what the RPCs do. > > > > [Sandy]: Added some description. > > > > > > > > - Section 6 any plans for notifications? If not, just say so. > > > > [Sandy]: Done. > > > > > > > > - Need Security > > > > Considerations, see sections 3.7 and 6 of rfc6087bis-15 > > > > [Sandy]: Added security consideration section. > > > > > > > > - Need IANA Considerations, see section 3.8 of rfc6087bis-15 > > > > [Sandy]: Added IANA considerations. > > > > > > > > - Need license in YANG module, > > > > see appendix B of rfc6087bis-15 > > > > [Sandy]: Added the YANG module description. > > > > > > > > Thanks, > > > > Sandy > > > > > > > > > > > > > > _______________________________________________ > yang-doctors mailing list > yang-doctors@ietf.org > https://www.ietf.org/mailman/listinfo/yang-doctors -- Ladislav Lhotka Head, CZ.NIC Labs PGP Key ID: 0xB8F92B08A9F76C67 _______________________________________________ yang-doctors mailing list yang-doctors@ietf.org https://www.ietf.org/mailman/listinfo/yang-doctors
- [yang-doctors] How to restrict to have single con… Reshad Rahman (rrahman)
- Re: [yang-doctors] How to restrict to have single… Martin Bjorklund
- Re: [yang-doctors] How to restrict to have single… Ladislav Lhotka
- Re: [yang-doctors] How to restrict to have single… Acee Lindem (acee)
- Re: [yang-doctors] How to restrict to have single… Ladislav Lhotka
- Re: [yang-doctors] How to restrict to have single… Martin Bjorklund
- Re: [yang-doctors] How to restrict to have single… Ladislav Lhotka
- Re: [yang-doctors] How to restrict to have single… Reshad Rahman (rrahman)
- Re: [yang-doctors] How to restrict to have single… Martin Bjorklund
- Re: [yang-doctors] How to restrict to have single… Xufeng Liu
- Re: [yang-doctors] How to restrict to have single… Reshad Rahman (rrahman)
- Re: [yang-doctors] How to restrict to have single… Acee Lindem (acee)
- Re: [yang-doctors] How to restrict to have single… Martin Bjorklund
- Re: [yang-doctors] How to restrict to have single… Christian Hopps
- Re: [yang-doctors] How to restrict to have single… Xufeng Liu
- Re: [yang-doctors] How to restrict to have single… Acee Lindem (acee)
- Re: [yang-doctors] How to restrict to have single… Acee Lindem (acee)
- Re: [yang-doctors] How to restrict to have single… Reshad Rahman (rrahman)
- Re: [yang-doctors] How to restrict to have single… Martin Bjorklund
- Re: [yang-doctors] How to restrict to have single… Reshad Rahman (rrahman)
- Re: [yang-doctors] How to restrict to have single… Xufeng Liu
- Re: [yang-doctors] How to restrict to have single… Ladislav Lhotka