Internet-Draft | Performance Monitoring YANG | October 2022 |
Yu | Expires 27 April 2023 | [Page] |
This document defines a YANG data model for performance Monitoring in optical networks which provides the functionalities of performance monitoring task management, TCA (Threshold Crossing Alert) configuration and performance data retrieval.¶
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Performance monitoring is a basic function of optical networks management. With it, operators can proactively detect the running state of devices, identify major risks in advanced and avoid users' complaints.¶
As before, TMF has defined interfaces for performance management through traditional protocols, such as CORBA and MTOSI. With the development of SDN technologies and the using of RESTCONF interfaces, it becomes a widespread requirement to use RESTCONF protocol to support performance monitoring.¶
Using RESTCONF does not mean changing existing performance monitoring requirements or scenarios. On the contrary, since O&M is very important, many operators' O&M departments tend to be conservative. They are fear of introducing issues into their network due to the protocol changes and O&M habits changes. Therefore, our document prefers to use the new protocol to support legacy functionality.¶
Traditional performance management involves control of performance monitoring, setting collectors on monitored objects, and obtaining performance data in different periods. The data can be real-time data on devices, quasi-real-time data processed by domain controllers, and historical performance data. TCA can be also configured by performance monitoring tasks.¶
The explanation of performance monitoring indicator would also be an important part of this document, especially the missing optical-specific indicators of TMF.¶
Currently, there are some existing documents related to performance monitoring in IETF, but there is no overlap with our current work. For example:¶
[I-D.ietf-teas-actn-pm-telemetry-autonomics] provides a YANG data model that describes performance monitoring and scaling intent mechanisms for TE-Tunnels and Virtual Networks(VNs). VN is determinate to be used in CMI (CNC-MDSC Interface) level and TE tunnel is more service or connection related. Our data model is proposed to be used in MPI (MDSC-PNC Interface) level and performance monitoring is performed on physical network resources, such as network element, board, fiber, port or ODUk channels, which are not included in [I-D.ietf-teas-actn-pm-telemetry-autonomics].¶
[I-D.ietf-opsawg-yang-vpn-service-pm] defines a YANG data model for performance monitoring of both network topology layer and overlay VPN service topology layer. VPN service is more IP-specific and not adopted in Optical domain. And the data model in this document is augmenting network model. If the client wants to retrieve performance data of a link by RESTCONF, the URL would be probably same with the URL of topology retrieval. This may need some special mechanisms to make the client and server differentiate the using scenarios. This is not quite compliance with the O&M habits of Optical technology.¶
[I-D.zheng-ccamp-client-pm-yang] provides a performance monitoring YANG data model on client signal level. It is also not operated on resource level which is not compliance with the existing O&M habits. This performance monitoring solution is more user-oriented and can be used for more automatic O&M scenarios in the future. However, although there is no complete closed-loop O&M solution at the service layer and is not accepted by all operators' O&M departments, resource-based performance monitoring is still required.¶
The YANG data model defined in this document conforms to the Network Management Datastore Architecture (NMDA).¶
Refer to [RFC7446] and [RFC7581] for the key terms used in this document. The following terms are defined in [RFC7950] and are not redefined here:¶
The following terms are defined in [RFC6241] and are not redefined here:¶
The following terms are defined in [RFC8454] and are not redefined here:¶
//To Be Added: some explanation of performance indicator¶
A simplified graphical representation of the data model is used in Section 3 of this document. The meaning of the symbols in these diagrams are defined in [RFC8340].¶
In this document, names of data nodes and other data model objects are prefixed using the standard prefix associated with the corresponding YANG imported modules, as shown in the following table.¶
Prefix | Yang Module | Reference |
---|---|---|
pm | ietf-performance-monitoring | RFCXXXX |
pm-types | ietf-performance-monitoring-types | RFCXXXX |
yang | ietf-yang-types | [RFC6991] |
RFC Editor Note: Please replace XXXX with the RFC number assigned to this document.¶
According to the business requirements stated in [TMF-518], resource performance management requirements include:¶
For these requirements of PM, there are three group of interfaces are defined in TMF, including PerformanceManagementControl, PerformanceManagementRetrieval and ThresholdCrossingAlertControlm.¶
The functionalities of this group of interfaces are:¶
The functionalities of this group of interfaces are:¶
The functionalities of this group of interfaces are:¶
//To Be Added¶
<Add any manageability considerations>¶
<Add any security considerations>¶
<Add any IANA considerations>¶
This document was prepared using kramdown.¶