Re: [Lsr] Yangdoctors last call review of draft-ietf-isis-yang-is-is-cfg-29

tom petch <ietfc@btconnect.com> Wed, 02 January 2019 11:16 UTC

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From: tom petch <ietfc@btconnect.com>
To: "stephane.litkowski@orange.com" <stephane.litkowski@orange.com>, Ebben Aries <exa@juniper.net>, "yang-doctors@ietf.org" <yang-doctors@ietf.org>
CC: "draft-ietf-isis-yang-isis-cfg.all@ietf.org" <draft-ietf-isis-yang-isis-cfg.all@ietf.org>, "lsr@ietf.org" <lsr@ietf.org>
Thread-Topic: [Lsr] Yangdoctors last call review of draft-ietf-isis-yang-is-is-cfg-29
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Archived-At: <https://mailarchive.ietf.org/arch/msg/lsr/lYL7aIn1yY-iGNRq3485KUAN5Vc>
Subject: Re: [Lsr] Yangdoctors last call review of draft-ietf-isis-yang-is-is-cfg-29
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Here are the rest of my comments on -29 with a slight tweak to the
subject line.  I would regard most of these (but not the first two) as
non-discussable, ie I won't complain if you disagree:-)

RFC1195 is in the YANG module but not the references of the I-D

RFC5029 is in the YANG module but not the references of the I-D

PSNPs, CSNPs
expand on first use - LSP I think ok

        leaf best {           type boolean;
what is true and what false?  I can guess from the English semantics of
the name but would rather not guess.

        leaf non-best-reason {          type string;
suggest a maximum length, perhaps 127 or 255 ( unless you expect
screenshots or packet traces to be attached).  As it stands, you could
validly receive
a length of 18446744073709551615.

You have a mixture of
System-id system-id System id System ID System Id system id system ID
suggest consistency; system-id wfm

You have a mixture of
lsp-id LSPID LSP ID
here, perhaps lsp-id for the names and LSP ID in the text

      case password {        leaf key {           type string;
perhaps better with a minimum length

        leaf i-e {          type boolean;
what is true and what false?  here I am reluctant even to guess

/"Authentication keyto/  "Authentication key to/

"     the authentication key MUST NOT be presented in"
RFC2119 language means that RFC2119 boilerplate should be in the YANG
module (but without the [..] ie the reference must be plain text not an
anchor).


 It is recommended to use an MD5
           hash to present the authentication-key.";
Mmm I think that this may be a red flag to security AD or directorate as
being too vague as well as MD5 too weak; and I think this should be
explicitly called out in Security Considerations.

      list level-db {        key level;        leaf level {
A common convention is for a list of leaf thing to be named things i.e.
      list levels {         key level;        leaf level {

  rpc clear-adjacency {
          "Name of the IS-IS protocol instance whose IS-IS
           information is being queried.
queried or cleared?

Tom Petch


----- Original Message -----
From: "tom petch" <ietfc@btconnect.com>
Sent: Monday, December 31, 2018 6:21 PM
Subject: Re: [Lsr] Yangdoctors last call review of
draft-ietf-isis-yang-isis-cfg-24


> Stephane
>
> A new and different comment.
>
>   grouping neighbor-gmpls-extensions {
>
> has a text reference to RFC5307 which does not appear in the
references
> for the I-D.  However, before adding it, I would like to know why it
is
> a good reference for switching capabilities (which is part of this
> grouping).  I think that the reference for switching capabilities
should
> be RFC7074 (which this I-D does not currently reference and should
IMO).
>
> And that begs the  question, why is switching-capability an
unrestricted
> uint8 when only 12 values are valid and three are deprecated?
>
> So why not use
>
> draft-ietf-teas-yang-te-types?
>
> I have a number of additional comments on cfg-29 but this is the one
> that may take some discussion.
>
> Tom Petch
>
>
> ----- Original Message -----
> From: <stephane.litkowski@orange.com>
>
> Hi Tom,
>
> Thanks for your comments. I will fix them asap.
> Regarding:
> " Line length is within the RFC limit but the effect is to spread many
> of the description clauses over multiple lines with indentation of 56
> characters, not user friendly e.g.
>                                         description
>                                                 "List of max LSP
> bandwidths for different
>                                                  priorities.";
> "
> What's your suggestion on this one ?
>
> Brgds,
>
> -----Original Message-----
> From: tom petch [mailto:ietfc@btconnect.com]
> Sent: Tuesday, November 27, 2018 12:11
> To: Ebben Aries; yang-doctors@ietf.org
> Cc: draft-ietf-isis-yang-isis-cfg.all@ietf.org; lsr@ietf.org; Tarek
Saad
> (tsaad)
> Subject: Re: [Lsr] Yangdoctors last call review of
> draft-ietf-isis-yang-isis-cfg-24
>
> Some quirks in-25
>
> I see lots of YANG reference statements - good - but no mention of
them
> in the I-D references - not so good.  My list is
>
> 5130
> 5305
> 5306
> 5880
> 5881
> 6119
> 6232
> 7794
> 7810
> 7917
> 8405
>
> Also perhaps
> OLD
>     reference "RFC XXXX - YANG Data Model for Bidirectional
>                Forwarding Detection (BFD).Please replace YYYY with
>                                                          published RFC
> number for draft-ietf-bfd-yang.";
>
> NEW
>     reference "RFC YYYY - YANG Data Model for Bidirectional
>                Forwarding Detection (BFD).
>
> -- Note to RFC Editor Please replace YYYY with published RFC
> number for draft-ietf-bfd-yang.";
>
> OLD
>       reference "draft-ietf-bfd-yang-xx.txt:
>                  YANG Data Model for Bidirectional Forwarding
>                  Detection (BFD)";
> NEW
>     reference "RFC YYYY - YANG Data Model for Bidirectional
>                Forwarding Detection (BFD).
>
> -- Note to RFC Editor Please replace YYYY with published RFC
> number for draft-ietf-bfd-yang.";
>
>
> Line length is within the RFC limit but the effect is to spread many
of
> the description clauses over multiple lines with indentation of 56
> characters, not user friendly
> e.g.
>                                         description
>                                                 "List of max LSP
> bandwidths for different
>                                                  priorities.";
>
>
> Acknowledgements is TBD. I note that the editor list of the YANG
module
> is somewhat longer than the editor list of the I-D.
>
> I note that the augmentation of interfaces seems to have no
conditional
> and so will augment all interfaces. I think that this is a generic
issue
> but do not see it being addressed anywhere.
>
> In a similar vein, you are defining MPLS objects and I am unclear
> whether or not those should be conditional, or part of the MPLS YANG
> modules or both (copying Tarek for this)
>
> Tom Petch
>
> ----- Original Message -----
> From: "Ebben Aries" <exa@juniper.net>
> Sent: Tuesday, October 23, 2018 12:45 AM
>
> > Reviewer: Ebben Aries
> > Review result: On the Right Track
> >
> > 1 module in this draft:
> > - ietf-isis@2018-08-09.yang
> >
> > No YANG compiler errors or warnings (from pyang 1.7.5 and yanglint
> 0.16.54)
> >
> > "ietf-isis@2018-08-09" module is compatible with the NMDA
> architecture.
> >
> > Module ietf-isis@2018-08-09.yang:
> > - Both the description and the draft name reference that this module
> is
> >   specific to configuration but contains operational state nodes in
> addition
> >   to RPCs and notifications.  Any wording suggesting this is only
> >   configuration should be changed
> > - Module description must contain most recent copyright notice per
> >
>
https://tools.ietf.org/html/draft-ietf-netmod-rfc6087bis-20#section-3.1
> > - Module description reads "common across all of the vendor
> implementations".
> >   I don't think this needs to be called out as such as that is the
> overall
> >   intention of *all* IETF models
> > - This module contains '22' features (and the respective OSPF module
> currently
> >   contains '26').  While it is understood the purpose of these
> features in the
> >   module, take precaution as to complexity for clients if they need
to
> >   understand >= quantity of features per module in use on a
> >   network-element.  We are going to end up w/ feature explosion to
> convey
> >   *all* possible features of each network-element leading to
> divergence back
> >   towards native models at the end of the day.  A large amount of
> these
> >   feature names could be defined within a more global namespace
(e.g.
> nsr) but
> >   this gives us a granular yet cumbersome approach (e.g. feature
> isis:nsr,
> >   ospf:nsr, etc..)
> > - RPC 'clear-adjacency' does not have any input leaf that covers
> clearing a
> >   specific neighbor/adjacency (See comments below as well regarding
> RPC
> >   alignment w/ the OSPF model)
> > - RPC 'clear-adjacency' has an input node of 'interface' however
this
> is just
> >   a string type.  Is there any reason this is not a
> leafref/if:interface-ref
> >   (much like in the OSPF model)
> > - Child nodes within a container or list SHOULD NOT replicate the
> parent
> >   identifier per
> >
>
https://tools.ietf.org/html/draft-ietf-netmod-rfc6087bis-20#section-4.3.
> 1.
> >
> >   A case in point is the list /afs/af that has a leaf of 'af'
> >       <afs>
> >         <af>
> >           <af>ipv4</af>
> >           <enable>true</enable>
> >         </af>
> >       </afs>
> >
> >   Not only is this replication, but we should likely not abbreviate
> 'afs' if
> >   we are using the expanded 'address-family' in other IETF models
such
> as
> >   ietf-i2rs-rib
> >
> >
> > General comments on the draft + nits:
> > - Since YANG tree diagrams are used, please include an informative
> reference
> >   per
>
https://tools.ietf.org/html/draft-ietf-netmod-rfc6087bis-20#section-3.4
> > - Section 1.1 does not need to exist since this would be covered by
> the
> >   reference mentioned above
> > - Reference to NMDA compliance should be contained within Section 1
> (vs.
> >   Section 2) per
> >
>
https://tools.ietf.org/html/draft-ietf-netmod-rfc6087bis-20#section-3.5
> > - Section 2: It seems reference should be given to the location of
> where the
> >   ietf-routing module is defined (As well as reference to NMDA RFC
in
> the
> >   above reference)
> > - Section 2.1: "Additional modules may be created this to
support..."
> needs
> >   slight rewording adjustment
> > - Section 3: The RPC operations are named 'clear-adjacency' and
> >   'clear-database' rather w/ reliance off namespacing for
uniqueness.
> This
> >   section refers to 'clear-isis-database' and 'clear-isis-adjacency'
> > - Section 4: Notification name mismatch in this section from actual
> naming
> >   within the module (e.g. 'adjacency-change' should rather be
> >   'adjacency-state-change')
> > - Section 7: Security Considerations will need updating to be
> patterned after
> >   the latest version of the template at
> >   https://trac.ietf.org/trac/ops/wiki/yang-security-guidelines per
> >
>
https://tools.ietf.org/html/draft-ietf-netmod-rfc6087bis-20#section-3.7
> > - Section 12: All modules imported within this module MUST be
> referenced
> >   within this section per
> >
>
https://tools.ietf.org/html/draft-ietf-netmod-rfc6087bis-20#section-3.9.
> >   There are quite a few missing from this section right now
> > - Appendix A: Some of the XML elements are off in alignment
> > - Appendix A: Examples must be validated.  The example given has the
> following
> >   issues:
> >   - /routing[name='SLI'] and /routing/description are invalid data
> nodes and
> >     do not exist.  I'm not sure why they are in the XML example here
> >   - The example is meant to reference configuration however
> >     /routing/interfaces is a r/o container
> >   - The control-plane-protocol 'type' needs to be qualified - e.g.
> >     <type
> xmlns:isis="urn:ietf:params:xml:ns:yang:ietf-isis">isis:isis</type>
> >   - The area-address does not validate against the pattern regex and
> must end
> >     with a '.'  e.g.
> >     <area-address>49.0001.0000.</area-address>
> >   - metric-type/value is set to 'wide' which is invalid.  This
should
> rather
> >     be 'wide-only'
> >   - isis/afs/af/af is set to 'ipv4-unicast' which is invalid.  This
> should
> >     rather be 'ipv4' per iana-routing-types
> >   - /interfaces/interface/type must be populated and is invalid.
This
> should
> >     rather be qualified as such:
> >     <type
>
xmlns:ianaift="urn:ietf:params:xml:ns:yang:iana-if-type">ianaift:softwar
> eLoopback</type>
> >     <type
>
xmlns:ianaift="urn:ietf:params:xml:ns:yang:iana-if-type">ianaift:etherne
> tCsmacd</type>
> >   - /interfaces/interface/link-up-down-trap-enable must have a value
> >     associated as such:
> >     <link-up-down-trap-enable>enabled</link-up-down-trap-enable>
> >   - NP container 'priority' has a must statement checking if an
> interface-type
> >     is set to 'broadcast' however if you take the XML example from
> this
> >     section, it will fail to validate even if <priority> is not
> defined
> >     underneath an interface-type of 'point-to-point'.  It seems to
me
> that
> >     this logic may need to be readjusted or not exist at all
(priority
> can
> >     still be set on implementations on loopback interfaces - which
> would
> >     default to 'broadcast' in the example here).  Could you not
solve
> this
> >     with use of 'when' vs. 'must' as such:
> >
> >           when '../interface-type = "broadcast"' {
> >               description "Priority can only be set for broadcast
> interfaces.";
> >           }
> >
> >
>
https://tools.ietf.org/html/draft-ietf-netmod-rfc6087bis-20#section-4.18
> ..2.
> >
> >   - /interfaces/interface/ipv4/mtu must contain a valid value (and
> likely not
> >     need to be defined for Loopback0)
> >   - 'isis/mpls-te/ipv4-router-id' is invalid and should rather be
> >     'isis/mpls/te-rid/ipv4-router-id'
> >   - 'isis/afs/af/enabled' is invalid and should rather be
> 'isis/afs/af/enable'
> >   - Examples should use IPv6 addresses where appropriate per
> >
>
https://tools.ietf.org/html/draft-ietf-netmod-rfc6087bis-20#section-3.12
>
>
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