Carrier Ethernet Class of Service - Phase 2

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name MEF 23.1.pdf page Reference Documents

MEF 23.1 is a specification developed by the Technical Committee of the MEF that provides an Implementation Agreement for Carrier Ethernet Class of Service.

Abstract:

"In order to provide differentiated levels of service, it is necessary to classify incoming frames to a service level either based on context (e.g., which EVC or OVC) or content (i.e, the contents of a specific field within the frame).

MEF10.3 and MEF26.2 provide attributes for associating each ingress frame with a Class of Service Name (CoS Name) for this purpose. Those specifications also provide attributes for associating each ingress frame with a color.

This Implementation Agreement formalizes the CoS Name and defines three specific CoS Names called Class of Service Labels (CoS Labels).

For frames associated with a CoS Label, this IA provides:

• values for fields containing the CoS identifier
• values for fields containing the frame color
• definition of Performance Tiers. Performance Tiers provide a way to define sets of performance objectives based on inherent characteristics of the service (primarily geographic span).
• specific performance objectives. Required values for performance objectives are specified in this document for service with a Class of Service identified by one of the MEF CoS Labels.
• requirements associated with bandwidth profile applicability to frames associated with the CoS Labels.

This IA also provides guidelines for CoS Names, in general, in terms of how the performance objectives for OVCs are composed into performance objectives for EVCsThis Implementation Agreement (IA) specifies a set of Class of Service Names called CoS Labels that can be used by Operators, Service Providers and their Subscribers to indicate the
performance expectations to be associated with a given set of frames that comprise a CoS Frame Set. This CoS IA includes standards for CoS and Color identification as well as performance
objectives and supporting requirements. The CoS Labels are envisioned as a subset of all of the Class of Service Names an Operator may provide. The MEF CoS IA facilitates: Ethernet service interoperability and consistency between Operators, use of a common CoS Label set for Subscribers to utilize and use of performance objectives that support key applications. The terms CoS Label, CoS Name, CoS Frame Set and others are defined in Section 2 of this IA."

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