Re: [mpls] mldp was Re: Yangdoctors last call review of draft-ietf-mpls-ldp-yang-06
"Kamran Raza (skraza)" <skraza@cisco.com> Mon, 23 December 2019 18:06 UTC
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From: "Kamran Raza (skraza)" <skraza@cisco.com>
To: tom petch <ietfc@btconnect.com>, Jan Lindblad <janl@tail-f.com>
CC: "mpls@ietf.org" <mpls@ietf.org>, "draft-ietf-mpls-ldp-yang.all@ietf.org" <draft-ietf-mpls-ldp-yang.all@ietf.org>, "draft-ietf-mpls-ldp-yang@ietf.org" <draft-ietf-mpls-ldp-yang@ietf.org>
Thread-Topic: mldp was Re: [mpls] Yangdoctors last call review of draft-ietf-mpls-ldp-yang-06
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Date: Mon, 23 Dec 2019 18:06:24 +0000
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Subject: Re: [mpls] mldp was Re: Yangdoctors last call review of draft-ietf-mpls-ldp-yang-06
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Hi Tom, Thanks for your review. We've just replied to Jan's review. Please see further below inline [skraza]: On 2019-10-15, 12:38 PM, "tom petch" <ietfc@btconnect.com> wrote: Jan It would likely help if you could also look at draft-ietf-mpls-mldp-yang-06 which augments draft-ietf-mpls-ldp-yang-06 with such as [widescreen needed] module: ietf-mpls-mldp augment /rt:routing/rt:control-plane-protocols/ldp:mpls-ldp/ldp:global/ldp:capab ility: and augment "/rt:routing/rt:control-plane-protocols/" + "ldp:mpls-ldp/ldp:peers/ldp:peer/ldp:received-peer-state/" + "ldp:capability/mldp:mldp" { i.e. there are another 20 or so augment which are affected by the changes you propose. Note that the prefixes are ldp: and mldp: so the identities for the control plane protocols are probably better as those and not mpls-ldp or mpls-mldp. But is mldp a separate protocol in RFC8349 terms or just part of ldp? I do not know. [skraza]: We had discussed this day-1 of LDP/mLDP YANG design mtgs and had x-vendor consensus to make mLDP a child/dependent of LDP. So we do not need a separate identity for this. The mldp draft has just completed WGLC. I looked at it but gave up on it because the line lengths were too long to display on my screen. [skraza]: We will also fix the draft .txt format at next publication of mldp draft. Tom Petch ----- Original Message ----- From: "Jan Lindblad via Datatracker" <noreply@ietf.org> To: <yang-doctors@ietf.org> Cc: <mpls@ietf.org>; <draft-ietf-mpls-ldp-yang.all@ietf.org>; <ietf@ietf.org> Sent: Tuesday, October 15, 2019 1:07 PM Subject: [mpls] Yangdoctors last call review of draft-ietf-mpls-ldp-yang-06 > Reviewer: Jan Lindblad > Review result: Ready with Issues > > Modules: ietf-mpls-ldp.yang, ietf-mpls-ldp-extended.yang > Review result: Ready with Issues > Reviewer: Jan Lindblad > > This is my YANG doctor LC review of draft-ietf-mpls-ldp-yang-06. I find the > module ready with issues, even if there are a couple rather fundamental things > to work out. It is evident that the authors have spent considerable time to > make the module clean and tidy, which is why I can say it's more or less ready > even when there are fundamentals to work out. In my judgement it may be > possible to work out all remaining issues rather quickly. > > #1) Fitting mpls-ldp into the ietf-routing framework > > The modules at hand, ietf-mpls-ldp.yang and ietf-mpls-ldp-extended.yang, are > augmenting into the ietf-routing module (RFC 8022). I find this highly > appropriate. RFC 8022 has a section on how control plane protocols are meant to > fit into the ietf-routing framework: > > 5.3.2. Defining New Control-Plane Protocols > > It is expected that future YANG modules will create data models for > additional control-plane protocol types. Such a new module has to > define the protocol-specific configuration and state data, and it has > to integrate it into the core routing framework in the following way: > > o A new identity MUST be defined for the control-plane protocol, and > its base identity MUST be set to "rt:control-plane-protocol" or to > an identity derived from "rt:control-plane-protocol". > .... > o Configuration parameters and/or state data for the new protocol > can be defined by augmenting the "control-plane-protocol" data > node under both "/routing" and "/routing-state". > > The current draft is doing neither of the above two points. IMHO, it should do > both. Or if there is strong reason not to do that, incorporate a statement from > the ietf-routing authors and a clear explanation of why the mpls-ldp related > modules would be exempted. At present, this deviation from the RFC 8022 > architecture is never mentioned in the draft. > > Even if this issue falls under fundamental issues, the way I look at it, it > would be quite easy to fix. Adjusting the two draft modules to comply with the > points above requires changes to two dozen augment statement paths and a > handful of leafref paths. Adding the identity and corresponding when derived > from statement are a couple of lines. > > In principle, this change opens up for multiple instances of mpls-ldp. This > might be useful if a system is used with two entirely separate networks (such > as two separate customers), where each one might be running an mpls-ldp > instance. If this is not desired, a must statement could be introduced to limit > the number of instances to one. > > #2) Global level vs. local (e.g. interface or peer) level > > The module has several configurations that have a global and local level, such > as configurations per peer or per interface. Presumably, these local level > configurations are meant to override the global default when set and let the > global default prevail when nothing specific is specified at the local level. > > The way this is being currently implemented in the modules, however, makes it > impossible not to set a value at the local level, so the local setting will > always prevail. The global configuration would have no effect at all (except in > those cases where a local level configuration is marked with an if-feature and > the server would not announce that feature). > > For example: > > On the global level, there is a graceful-restart/enable leaf: > > container global { > .... > container graceful-restart { > leaf enable { > type boolean; > default false; > } > > Further down, we have another graceful-restart/enable leaf, used per peer: > > grouping graceful-restart-attributes-per-peer { > .... > container graceful-restart { > leaf enable { > type boolean; > default false; > } > > I would assume this latter enable leaf should take precedence over the global > graceful-restart when set on the peer. But if not set on the peer, the global > graceful-restart value should be used. Since the peer graceful-restart/enable > leaf has a default value, however, it will never happen that it is not set, and > will thus render the global value completely irrelevant for all peers. > > The fix is simple: Do not have a default statement on the local leafs. Explain > in the description statement what happens when the element has no value (the > globally configured value will be used). Make sure the global leaf has a > default (they all do already). > > The same applies to a rather long list of leafs in the module. I don't dare > listing them here, because I would surely miss a few. My point is that the > global/local relationships needs to be identified, local defaults removed. It > would also make sense to mention how this is supposed to work in the > descriptions. > > #3) Unlinked multikey leafrefs > > The grouping ldp-peer-ref has two leafrefs, one for each key in the list of ldp > peers. Two leafrefs are exactly what you need to reference an entry in a list > with two keys, so that's good. It is not enough to simply have two unlinked > leafrefs, however. That would still allow them to have values that are valid > separately, but not point to any entry in the list combined. If you have a copy > of "Network Programmability with YANG", this is explained in detail on pp. > 451-454. > > To link the leafrefs, you'd need to update the path expression in the > label-space-id leaf as follows: > > grouping ldp-peer-ref { > description > "An absolute reference to an LDP peer, by the LDP ID, which > consists of the LSR ID and the Label Space ID."; > > leaf lsr-id { > type leafref { > path "/rt:routing/rt:control-plane-protocols/ldp:mpls-ldp/" > + "ldp:peers/ldp:peer/ldp:lsr-id"; > } > description > "The LSR ID of the peer, as a portion of the peer LDP ID."; > } > leaf label-space-id { > type leafref { > path "/rt:routing/rt:control-plane-protocols/ldp:mpls-ldp/" > + "ldp:peers/ldp:peer[lsr-id = > current()/../lsr-id]/ldp:label-space-id"; > } > > The paths above would also have to be adjusted as part of fixing issue #1 > above. If this fixing results in allowing multiple mpls-ldp instances, the > grouping above needs to be extended with one additional, linked leafref that > points out which mpls-ldp instance is being targeted. Or if that is always the > same instance as the reference is coming from, a reformulation of the paths > above could ensure no mpls-ldp instance name would be required. In that case, > the paths should be relative and never venture outside the mpls-ldp container. > I would be happy to explain this further. > > #4) Weakly defined types for neighbor-list-ref, prefix-list-ref, peer-list-ref > > These types are not leafrefs, but strings without any YANG substatements to > define the format. The only thing the description does is to claim that the > entities they refer to are outside the scope of this document. For an > operator/programmer encountering this type, that isn't very helpful, and is not > going to be interoperable. > > typedef neighbor-list-ref { > type string; > description > "A type for a reference to a neighbor address list. > The string value is the name identifier for uniquely > identifying the referenced address list, which contains a list > of addresses that a routing policy can applied. The definition > of such an address list is outside the scope of this > document."; > } > > I'm not sure if this is fixable by sharpening the YANG module, but maybe more > could be done to guide a confused reader. What would the user do to find out > the format of this type and valid values? Add to the description. > > #5) Interfaces or mpls, who's on top? > > In the mpls-ldp modules, there are two interface lists and two leafrefs > pointing to interfaces. This makes me wonder if some of the YANG structure > would belong more naturally as an augment to ietf-interfaces instead? I mean, > it doesn't sound fun to define the same interfaces in a lot of different > places, just because a protocol needs some additional information. This is just > a casual observation from an mpls-innocent guy, so you can disregard if you > feel it's irrelevant. > > #6) MD5 key > > There is a leaf md5-key of type string. Is this leaf sensitive from a security > point of view? A plaintext string would not be ideal if that is the case. > Choose a crypto type instead. Also, the format of this string is not defined. > Hex without spaces? Explain the format in the description. > > >< > > _______________________________________________ > mpls mailing list > mpls@ietf.org > https://www.ietf.org/mailman/listinfo/mpls
- [mpls] Yangdoctors last call review of draft-ietf… Jan Lindblad via Datatracker
- Re: [mpls] [yang-doctors] Yangdoctors last call r… Martin Bjorklund
- [mpls] mldp was Re: Yangdoctors last call review … tom petch
- Re: [mpls] mldp was Re: Yangdoctors last call rev… Jan Lindblad
- Re: [mpls] Yangdoctors last call review of draft-… Kamran Raza (skraza)
- Re: [mpls] [yang-doctors] Yangdoctors last call r… Kamran Raza (skraza)
- Re: [mpls] mldp was Re: Yangdoctors last call rev… Kamran Raza (skraza)