[Teas] IETF TE Topology YANG Model Design Meeting Notes - 2016-09-12

[Xufeng Liu <[e-mail]>]

Participants:
Igor, Xufeng, Anurag, Dieter, Sergio

- Discussed attributes that are potentially technology specific.
  > Dieter has sent an email describing a list of such attributes.
  > Participants discussed the list.
  > The following section is not applicable to non-packet networks
   such as OCH and OTN, because the delay and bandwidth variations do
    not exist.
    We will move the section to packet augmentation:
      |     +-rw performance-metric-throttle {te-performance-metric}?
      |     |  +-rw unidirectional-delay-offset?           uint32
      |     |  +-rw measure-interval?                      uint32
      |     |  +-rw advertisement-interval?                uint32
      |     |  +-rw suppression-interval?                  uint32
      |     |  +-rw threshold-out
      |     |  |  +-rw unidirectional-delay?                 uint32
      |     |  |  +-rw unidirectional-min-delay?             uint32
      |     |  |  +-rw unidirectional-max-delay?             uint32
      |     |  |  +-rw unidirectional-delay-variation?       uint32
      |     |  |  +-rw unidirectional-packet-loss?           decimal64
      |     |  |  +-rw unidirectional-residual-bandwidth?    decimal64
      |     |  |  +-rw unidirectional-available-bandwidth?   decimal64
      |     |  |  +-rw unidirectional-utilized-bandwidth?    decimal64
      |     |  +-rw threshold-in
      |     |  |  +-rw unidirectional-delay?                 uint32
      |     |  |  +-rw unidirectional-min-delay?             uint32
      |     |  |  +-rw unidirectional-max-delay?             uint32
      |     |  |  +-rw unidirectional-delay-variation?       uint32
      |     |  |  +-rw unidirectional-packet-loss?           decimal64
      |     |  |  +-rw unidirectional-residual-bandwidth?    decimal64
      |     |  |  +-rw unidirectional-available-bandwidth?   decimal64
      |     |  |  +-rw unidirectional-utilized-bandwidth?    decimal64
      |     |  +-rw threshold-accelerated-advertisement
      |     |     +-rw unidirectional-delay?                 uint32
      |     |     +-rw unidirectional-min-delay?             uint32
      |     |     +-rw unidirectional-max-delay?             uint32
      |     |     +-rw unidirectional-delay-variation?       uint32
      |     |     +-rw unidirectional-packet-loss?           decimal64
      |     |     +-rw unidirectional-residual-bandwidth?    decimal64
      |     |     +-rw unidirectional-available-bandwidth?   decimal64
      |     |     +-rw unidirectional-utilized-bandwidth?    decimal64

      To retain the delay information, add the following:
      delay-metric?                 uint32

  > The data type "decimal64" is not convenient for OTN because the
    bandwidth is desired to be expressed as the number of channels,
    like 2 ODU1's.
    Participants agreed to suggest an augmentation in the OTN model,
    and not to change this model.

      |     +-rw interface-switching-capability* [switching-capability]
      |     |  +-rw switching-capability               identityref
      |     |  +-rw encoding?                          identityref
      |     |  +-rw max-lsp-bandwidth* [priority]
      |     |  |  +-rw priority     uint8
      |     |  |  +-rw bandwidth?   decimal64
      |     +-rw max-link-bandwidth?               decimal64
      |     +-rw max-resv-link-bandwidth?          decimal64
      |     +-rw unreserved-bandwidth* [priority]
      |     |  +-rw priority     uint8
      |     |  +-rw bandwidth?   decimal64

  > Discussed the deficiency of the above data type "decimal64", because it cannot represent very large number.
    Agreed to change the data type to a type representing IEEE 32 bit floating point number.

- Discussed the operator requirement to have the geo-location on node and
  link-tp (3 GPS values)
  > Following is the proposal.
  > Add the section on node, link-tp, and tunnel-tp.
  > Discussed whether to use rw or ro?
    Most agreed to use ro since user requested update does not make sense.
    If the attribute needs to be updated by provider operator, some
    other mechanism is needed.
  > precision:
    8th decimal place will have the precision 1.1mm.
    Oscar to check with the operator use cases.

augment /nw:networks/nw:network/nw:node:
   +--rw te-node-id?   te-types:te-node-id
   +--rw te!
      +--rw config
      +--ro state
      |  +--ro te-node-attributes
      |  |  +--ro schedules
      |  |  +--ro admin-status?          te-types:te-admin-status
      |  |  +--ro connectivity-matrix* [id]
      |  |  +--ro domain-id?             uint32
+      |  |  +--ro geolocation
+      |  |  |  +--ro altitude?    int64
+      |  |  |  +--ro latitude?    geographic-coordinate-degree
+      |  |  |  +--ro longitude?   geographic-coordinate-degree

  typedef geographic-coordinate-degree {
      type decimal64 {
        fraction-digits 8;
      }
      description
        "Decimal degree (DD) used to express latitude and longitude
         geographic coordinates.";
  }

Thanks,

- Xufeng

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