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IETF-TEAS-WG / ietf-teas-yang-path-computation

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Hop cumulative path metric #77

Closed italobusi closed 3 years ago

italobusi commented 4 years ago

What is a "Hop cumulative path metric"? The description should be enhanced. Is it defined elsewhere? If so, add reference.

Originally posted by @dieterbeller in https://github.com/rvilalta/ietf-te-path-computation/pull/70

italobusi commented 3 years ago

@efralaz, @carloperocchio : where the "Hop cumulative path metric" has been defined?

In RFC5441, we can only find:

  Type 4: Aggregate bandwidth consumption.

  Type 5: Load of the most loaded link.

  Type 6: Cumulative IGP cost.

  Type 7: Cumulative TE cost.
italobusi commented 3 years ago

After some offline discussion with @efralaz , it has been clarified that this metric is not defined in RFC5441.

However, this seems to be the "cumulative" variant of the Hop path metric defined in RFC8776:

     identity path-metric-hop {
       base path-metric-type;
       description
         "Hop path metric.";
     }

@dieterbeller : what about redefining it as "Cumulative hop path metric" and referencing RFC8776?

  identity svec-metric-cumul-hop {
    base svec-metric-type;
    description
      "Cumulative hop path metric.";
    description
      "RFC8776: Common YANG Data Types for Traffic Engineering";
  }

Co-authored-by: sergiobelotti sergio.belotti@nokia.com

dieterbeller commented 3 years ago

The proposed reference to RFC8776 in in the description of identity svec-metric-cumul-hop (see: https://github.com/rvilalta/ietf-te-path-computation/issues/77#issuecomment-764747930 above) looks good to me.