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

Source of RFC: mpls (rtg)

Errata ID: 7060
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:next-hop-list/"
        + "rt:next-hop-list/rt:next-hop" {
    description
      "This leaf augments the 'next-hop-list' case of IP unicast
       routes.";
    uses nhlfe-multiple-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:next-hop-list/"
        + "rt:next-hop-list/rt:next-hop" {
    description
      "This leaf augments the 'next-hop-list' case of IP unicast
       routes.";
    uses nhlfe-multiple-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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