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RFC 8960, "A YANG Data Model for MPLS Base", December 2020

Source of RFC: mpls (rtg)

Errata ID: 7059
Status: Reported
Type: Technical
Publication Format(s) : TEXT, PDF, HTML

Reported By: Jan Lindblad
Date Reported: 2022-07-29

Section 2.5 says:

        augment "/rt:routing/rt:ribs/rt:rib/rt:routes/rt:route/"
              + "rt:next-hop/rt:next-hop-options/rt:simple-next-hop" {
          description
            "Augments the 'simple-next-hop' case in IP unicast routes.";
          uses nhlfe-single-contents {
            when "/rt:routing/rt:ribs/rt:rib/rt:routes/rt:route"
               + "/mpls:mpls-enabled = 'true'";
          }
        }

It should say:

        augment "/rt:routing/rt:ribs/rt:rib/rt:routes/rt:route/"
              + "rt:next-hop/rt:next-hop-options/rt:simple-next-hop" {
          description
            "Augments the 'simple-next-hop' case in IP unicast routes.";
          uses nhlfe-single-contents {
            when "../../../mpls:mpls-enabled = 'true'";
          }
        }

Notes:

The original YANG statements make the "uses" statement apply to all rt:rib and all rt:route instances as soon as there is at least one instance that has mpls:mpls-enabled set to true. I suspect this is not the author's intent.

The corrected YANG statements make the "uses" statement only apply to the specific route instances that have mpls:mpls-enabled set to true. There are also other ways to fix this issue.

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