Look to merge WSON Tunnel and Flexi-Grid Tunnel I-D(s)

[danielkinguk]

The plan is to merge both I-Ds, we need to investigate the effort required and what can be kept/removed. We will submit the new I-D shortly after IETF 117.

[aguoietf]

The proposal for the merge discussed on today's call - please review and comment.

wdm-tunnel.txt

[aguoietf]

Call Minutes 2023-10-05:

Agenda: discuss Aihua's YANG model proposal here to merge WSON and Flexi-grid tunnel.

Issues/Action Items:

For transceiver constraints, operational-mode should be defined as a list instead of a single value

• Change has been introduced to the model

  |  +--rw operational-modes*     string

It is suggested to add a new parameter, delta-power to the tunnel to indicate the per-channel power deviation at OMS section

• Added "delta-power" to the tunnel constraint

  augment /te:te/te:tunnels/te:tunnel:
  +--rw wdm-constraint
  ....
  +--rw delta-power?                   l0-types:decimal-2-digits --> type should be in dB

It may be useful to know the maximum # of channels on a link to ensure the optical performance. Agreed that it is a system design / planning issue and does not associate to a particular tunnel, therefore no need to define it in the model

• No change to the YANG model is needed

It was suggested to reuse the transmitter tuning range definitions in l0-types as opposed to re-defining the tx-tuning-range in the tunnel model

• Current l0-types-ext does not have a separate grouping definition for the tuning range. Also the existing tuning range definitions has all the parameters in read-only mode. Need to update l0-types grouping with the following changes:
• define a new grouping, "transmitter-tuning-range" and remove the read-only statement.
• add config=false to the container organizational-mode to make sure these parameters remain as read only in other YANG models such as ccamp-optical-impairment that use the same grouping
• use this grouping as read-write mode in the wdm-tunnel model

  +--rw wdm-constraint
  +--rw transceiver-constraint
  |  +--rw operational-modes*     string
  |  +--rw tx-tune-constraints
  |     +--rw min-central-frequency?    frequency-thz
  |     +--rw max-central-frequency?    frequency-thz
  |     +--rw transceiver-tunability?   frequency-ghz

Esther suggested to add two additional parameters, estimated GSNR at end of life, and estimated lowest (worst-case) GSNR for the computed path, in addition to the estimated current GSNR

• Added the two attributes to the YANG model

  augment /te:te/te:tunnels/te:tunnel/te:primary-paths
  /te:primary-path/te:computed-paths-properties
  /te:computed-path-properties/te:path-properties:
  +--ro estimated-gsnr?          snr
  +--ro estimated-eol-gsnr?      snr
  +--ro estimated-lowest-gsnr?   snr

[aguoietf]

Changed the type for delta-power to dB according to the call today (2023-10-19). The change is here

OLD:

       +--rw delta-power?                   l0-types:decimal-2-digits

NEW:

       +--rw delta-power?                  l0-types:gain-in-db-or-null

[aguoietf]

Done.