Subject: [CCAMP] Review comments for ietf-l1csm YANG model

From: Italo Busi <[email-masked]>
Date: Tue, 12 May 2020 15:58:39 +0000

Hi all,

I have reviewed the ietf-l1csm YANG model in draft-ietf-ccamp-l1csm-yang-11 and I have some comments which may have an impact also on layer1-types YANG model (which has already gone through WG LC):

1)      The protocol attribute, as defined in MEF 63, is not the same as the client-signal in layer1-types. The protocol can assume only one of these values: Ethernet, Fibre Channel, SDH or SONET.

2)      The coding-function attribute, as defined in MEF 63, is almost equivalent to the client-signal.

For example, STM-1 can be used either as client-signal or as a coding-function.

However, there are some client-signals, defined by ITU-T G.709, which are not defined by MEF 63 as coding-function.
For example, FICON-4G is defined as a client-signal in ITU-T but not corresponding coding functions are defined in MEF 63.

There are also cases where the client-signal and the coding-function uses different names.
For example, the ETH-1Gb client-signal and the ETH-1000X coding-function are using different names to represent the same client-signal/coding-function.

3)      According to MEF63, the configuration of the protocol, coding-function and optical-interface-functions attributes should be consistent: see Tables 4, 5, 6 and 7 of MEF63

It would be good if we can capture these constraints in the YANG model

4)      According to MEF63, the protocol, coding-function and optical-interface-function attributes are mandatory. Therefore the corresponding leaves could not be optional in YANG

5)      The current YANG model allows requesting L1CSM only when the UNIs support a <protocol, coding-function, optical-interface-function> defined in MEF63

It would still be worthwhile being able to request L1CSM also when the UNIs support a client-signal defined by ITU-T G.709 for which MEF has not yet defined/assigned a <protocol, coding-function, optical-interface-function>

6)      It is the only YANG model using the service-performance-metric identities defined in layer1-types, which are aligned with MEF definitions

To avoid any potential issues with the PM metrics to be defined in other YANG model, it is better to move to this model to the service-performance-metric identities from layer1-types

Comments 2), 3) and 5) would impact also the layer1-types YANG model

These comments are also tracked on github:

https://github.com/haomianzheng/IETF-ACTN-YANG-Model/issues/64

Initial thoughts for resolving this comments are also tracked on github as work-in-progress:

https://github.com/haomianzheng/IETF-ACTN-YANG-Model/pull/65

Thanks, Italo

Italo Busi
Principal Optical Transport Network Research Engineer

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