From: Tarek Saad <[email protected]>
Sent: 14 August 2020 17:24
Hi Acee and Tom,
The authors of ID: draft-ietf-mpls-base-yang met and we discussed the points
below.
We understand that RFC8349 defines an AF-agnostic model for RIBs. RFC8349
defined only two types of RIBs (IPv4 and IPv6 RIBs), but we envision other
types of RIBs too (e.g. L2 RIB, MCAST RIB, etc.), in addition to MPLS RIB --
and we hope all such RIBs indeed leverage the generic RIB model introduced in
RFC8349.
We revisited Acee's suggestion and made a small modification (on top of it)
that makes IP routes, MPLS routes (and possibly L2 or MCAST routes in future) -
all have similar MPLS augmentation (in terms of local-label) while still
adhering with RFC8349 to augment with leaf destination-prefix.
augment "/rt:routing/rt:ribs/rt:rib/rt:routes/rt:route" {
when "derived-from-or-self(../../rt:address-family, "
+ "'mpls:mpls')" {
description
"This augment is valid only for native MPLS routes.";
}
description
"This leaf augments a native MPLS route.";
leaf destination-prefix {
type leafref {
path "../local-label";
}
description
"MPLS destination prefix.";
}
}
We follow same approach for the active route RPC and continue to use a leaf
"destination-address" as input (that points to a local-label leaf).
If this is acceptable, we believe the errata 6251 can be rejected and we'll
proceed with the change in the MPLS RIB model.
<tp>
Tarek
Looks good but what about the other augments? In RFC8349, the AF constraint is
applied to augments to route, simple next hop and next hop list. You say that
you will add the constraint to the route in so doing creating an MPLS RIB but
what about next hop?
Tom Petch
Regards,
Tarek (for authors)
On 8/11/20, 9:08 AM, "Acee Lindem (acee)" <[email protected]> wrote:
[External Email. Be cautious of content]
Hi Tom, Draft Authors,
The draft could easily be fixed. You just need to:
1. Expand on the single sentence in section 2.1 on the need for non-IP
MPLS routes. Given that the draft wasn't modeled correctly, this wasn't
apparent to most of the reviewers.
2. Add an MPLS AF only augmentation (enforced via a when statement) to
each route for the MPLS AF specific destination-prefix or destination-address.
3. Limit the current local-label augmentation to non-MPLS AFs.
4. Limit the active-route augmentation to AF MPLS and change the input to
destination-address.
Thanks,
Acee
On 8/11/20, 6:10 AM, "tom petch" <[email protected]> wrote:
From: Acee Lindem (acee) <[email protected]>
Sent: 11 August 2020 10:47
Hi Tom,
I fully understood your original comment. There are other problems with
this model. See inline.
On 8/11/20, 4:59 AM, "tom petch" <[email protected]> wrote:
Tarek
Picking up on an earlier point,
________________________________________
From: Tarek Saad <[email protected]>
Sent: 10 August 2020 21:23
Hi Acee,
The existing RPC is used to query (defined AFIs=IPv4/IPv6) RIB to
return the matching active route identified by a "destination address".
The MPLS module is trying to reuse this RPC so to query the MPLS
RIB to return the matching active route identified by a "local label".
The RPC defined in RFC 8349 readily accepts MPLS AFI in it
(/rt:routing/rt:ribs/rt:rib/rt:active-route) - unless we augment and suppress
it with a "when check".
IMO, it is reusable as-is but the text below is limiting the leaf
name that identifies an entry in RIB to "destination-address" only - in MPLS
RIB the entry leaf name that identifies an entry is "local-label".
It is not reusable as is since the augmentation RPC augmentation must
have a when statement restricting it to AF MPLS. Also, local-label is a leaf
which is applicable to all address families. It cannot be the AF MPLS
destination-prefix. This augmentation is missing.
<tp>
I am probably getting out of my depth here, On 1may20 I raised the
issue of why the 'MUST' in the description in RFC8349 was not enforced in the
YANG and 5may20 Martin explained that there is a rule in the YANG ABNF of
input-stmt that makes the obvious impossible:-( You are raising more profound
issues about the RIB that I had not perceived when I reviewed mpls-base-yang
for which I, and I hope everyone else, will be grateful.
If this mpls I-D is to proceed in the immediate future, it looks like
the action may have to be deferred for future study.
More generally, I think that the interaction of forward by address and
forward by label is challenging. When first I looked at the MPLS I-D I was
surprised at the way RFC8349 was augmented. I had not seen MPLS as an
alternative to IPv4 or IPv6 or ... in the way in which the RFC is used although
the RFC does state that it can be; rather, to me, labels are a different
animal, but I assumed that everyone knew what they were doing.
Tom Petch
Thanks,
Acee
<tp>
There should be a 'when' check to enforce the 'MUST' but the rules
of YANG do not allow it in this structure. I raised this on the NETMOD list at
the time of WGLC and Martin pointed me to a rule in the ABNF which prohibits
such a check. He also said that the rule was not needed and would be a
candidate to remove when YANG is revised.
Hence I have always thought of this MUST in the documentation as a
constraint that must be enforced in the YANG
Tom Petch
> action active-route {
> description
> "Return the active RIB route that is used
for the
> destination address.
>
> Address-family-specific modules MUST
augment input
> parameters with a leaf named
'destination-address'.";
Regards,
Tarek
On 8/10/20, 3:27 PM, "Acee Lindem (acee)" <[email protected]> wrote:
[External Email. Be cautious of content]
All (Speaking as an author of RFC 8349),
I just looked at this in more detail and I don't think the
ietf-mpls.yang model should be augmenting the
/rt:routing/rt:ribs/rt:rib/rt:active-route RPC. The intent of the RPC is to
return the address-family specific active-route corresponding to the
destination-address. This model attempts to overload this RPC with a different
action all together - returning a route that has the local-label as an optional
attribute. I'd reject the Errata and believe the augmentation should be removed
from ietf-mpl.yang. Whether it is replaced with a different one is up to the
co-authors of ietf-mpls.yang.
Thanks,
Acee
On 8/10/20, 2:29 PM, "Rob Wilton (rwilton)" <[email protected]>
wrote:
[Resend to hopefully pass recipient limit filter]
Hi Tom,
I would be interested to hear from the original authors.
My impression is that this is a technically reasonable
change, but I don't think that an erratum can create a new revision of a YANG
module.
If this erratum was processed as "Hold for document update"
then would that be sufficient to do the right thing in the MPLS YANG module?
Regards,
Rob
> -----Original Message-----
> From: tom petch <[email protected]>
> Sent: 10 August 2020 17:32
> To: RFC Errata System <[email protected]>;
[email protected]; Acee
> Lindem (acee) <[email protected]>; [email protected];
[email protected];
> Rob Wilton (rwilton) <[email protected]>;
[email protected];
> [email protected]; [email protected]
> Cc: [email protected]; [email protected]
> Subject: Re: [netmod] [Technical Errata Reported] RFC8349
(6251)
>
> From: netmod <[email protected]> on behalf of RFC
Errata System
> <[email protected]>
> Sent: 07 August 2020 16:45
>
> <tp>
> This is the erratum of whose arrival I speculated on this
list on June
> 16th.
>
> There is a degree of urgency about it. The I-D in
question is mpls-base-
> yang, currently in IETF Last Call, which is a Normative
dependency of bfd-
> yang which is a Normative dependency for a small mountain
of I-D which
> have been waiting a year or so (e.g. ospf-yang).
>
> I suspect that the technically perfect solution would
involve a YANG
> union, choice or some such structure but as I said in my
Last Call comment
> I can live with a label that contains such as 'address'
encompassing such
> as 'label' in the context of forwarding. I take labels
to mean what
> labels mean rather than what I might find in a work of
reference.
>
> Tom Petch
>
> The following errata report has been submitted for
RFC8349,
> "A YANG Data Model for Routing Management (NMDA Version)".
>
> --------------------------------------
> You may review the report below and at:
>
https://urldefense.com/v3/__https://www.rfc-editor.org/errata/eid6251__;!!NEt6yMaO-gk!URK5WVsqD5g7WpzCU1VuzKJA0AUiawXBFLB_gENlsYMrpiMqDtyFoxw8DnSr2A$
>
> --------------------------------------
> Type: Technical
> Reported by: Tarek Saad <[email protected]>
>
> Section: 7
>
> Original Text
> -------------
> The RPC "active-route" is used to retrieve the active
route in a RIB.
> RFC8349 defined two AFIs (v4/v6).
>
> draft-ietf-mpls-base-yang is defining a new RIB AFI for
MPLS as per
> section 3 in RFC8349.
>
> The RPC has a "MUST" statement that all RIBs must augment
input
> parameters with a leaf named 'destination-address'.
>
> For MPLS RIB, it makes sense to augment with leaf named
'local-label'
> since MPLS routes are identified by MPLS label.
>
> We ask to make the following change:
>
> OLD:
> action active-route {
> description
> "Return the active RIB route that is used
for the
> destination address.
>
> Address-family-specific modules MUST
augment input
> parameters with a leaf named
'destination-address'.";
>
>
> Corrected Text
> --------------
> NEW:
> action active-route {
> description
> "Return the active RIB route that is used
for the
> destination address.
>
> Address-family-specific modules MUST
augment input
> parameters with a suitable leaf that
identifies the
> route.";
>
>
> Notes
> -----
>
>
> Instructions:
> -------------
> This erratum is currently posted as "Reported". If
necessary, please
> use "Reply All" to discuss whether it should be verified
or
> rejected. When a decision is reached, the verifying party
> can log in to change the status and edit the report, if
necessary.
>
> --------------------------------------
> RFC8349 (draft-ietf-netmod-rfc8022bis-11)
> --------------------------------------
> Title : A YANG Data Model for Routing
Management (NMDA
> Version)
> Publication Date : March 2018
> Author(s) : L. Lhotka, A. Lindem, Y. Qu
> Category : PROPOSED STANDARD
> Source : Network Modeling
> Area : Operations and Management
> Stream : IETF
> Verifying Party : IESG
>
> _______________________________________________
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