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IETF TE Tunnels YANG models
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Clarify why path-computation-error-reason has not been defined in an IANA-maintained model #281

Closed italobusi closed 1 month ago

italobusi commented 4 months ago

Offload path-computation-error-reason to an IANA-maintained model. The current design is suboptimal. Please refer to the 84047bis on these matters.

italobusi commented 4 months ago

The document is defining additional identities which are applicable to other contexts than PCE and in some cases they are in hierarchical relationship with the identities which applies to PCE:

path-computation-error-reason (base identity)
   path-computation-error-no-topology (TEAS-specific)
   path-computation-error-no-dependent-server (TEAS-specific)
      path-computation-error-child-pce-unresponsive (IANA)
      base path-computation-error-no-dependent-server (IANA)
   path-computation-error-pce-unavailable (IANA)

The IANA registry is flat so it is not possible to record in the registry the need for deriving the path-computation-error-child-pce-unresponsive and the path-computation-error-no-dependent-server from the path-computation-error-no-dependent-server instead of from the path-computation-error-reason like other identities (e.g., path-computation-error-pce-unavailable)