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Standards Efforts Enabling Standardized Management Major Developments De ned a framework to monitor and manage ows across a connectionless network (at the Ethernet layer) Carrier-class link level management and end-to-end service-level management de ned De ned local management interface to enable rapid provisioning and management Reference MEF 7, MEF 15, ITU G809 MEF 7, IEEE 8023ah, IEEE 8021ag, Y1731 MEF 16
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Key Components Uni ed management Carrier-class OAM
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Rapid services provisioning
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Sectionalized Management Service Layer Transport/Link Layer Connectivity Layer
First Mile (IEEE 8023ah)
Ethernet OAM a layered perspective
managed by the use of (less than efficient) Layer 3 protocols such as Simple Network Management Protocol (SNMP)20 As Carrier Ethernet is accelerating as a Carrier-class service delivered over multiple large and complex Service Provider networks, its OAM capabilities have to offer sophisticated tools to provision individual Ethernet services, monitor their performance, and identify and manage any issues quickly across such network topologies Ultimately, this will lead to reducing the total cost of ownership, which is a prerequisite before Carrier Ethernet can meaningfully attempt to become a mass market service In attempting to define a comprehensive OAM capability for Carrier Ethernet, a layered approach is conceptually employed21 to align with the layered nature of Service Provider networks used to deliver Carrier Ethernet Each of the OAM layers delineate the different focus and functionality of the respective layer in the context of delivering Carrier Ethernet This is shown in Figure 220 The three-layered OAM approach focuses on the service layer, the network/connectivity layer, and the transport/data-link layer The OAM at each of the layers is independent of the other layers; however, they all employ standard Ethernet frames as the means of OAM-related communication
Ironically, these management protocols would not be usable without the Ethernet (layer 2) being operational This scenario is somewhat ridiculous when there is an issue in Layer 2, then the higher layer based (ie, Layer 3) management protocol is useless, defeating the very purpose of having a management capability 21 There is not yet a formally defined OAM-layered model available, but the ones employed are generally close
2
Service Layer OAM at the service layer provides the capability to manage the entire Carrier Ethernet service being offered, ie, a service instance represented as a uniquely identified Ethernet Virtual Circuit (EVC) offered between two or more customer UNIs This end-to-end domain of the service basically the customer domain is ultimately what matters to the end-user experience, so here the OAM is focused on ensuring the service being offered is compliant with any agreed upon SLAs The OAM, therefore, provides the ability to monitor the performance of a service continually, independent of the underlying network infrastructure In addition, it also provides the capability to provision customer devices for services with specific performance and operational profiles Both the IEEE 8021ag and Y1731 focus on service layer fault management, while Y1731 augments with performance monitoring The MEF specification 16 standardizes around the capability to provision the customer premise equipment by a service provider Connectivity Layer An Ethernet service is usually provided by a Service Provider over a physical network infrastructure; this infrastructure could belong to and be managed by one or more providers (or operators), each employing different network technologies to deliver Carrier Ethernet services (eg, SONET, WDM, native Ethernet, MPLS, etc) The OAM in this layer is concerned with the connectivity between the network elements that underpin the service delivery In Figure 220, this encompasses the elements that exist between the boundaries of the Service Provider network (which, of course, could be comprised of networks belonging to multiple independent operators) and typically notated as being between the Provider Edge (PE) devices Providing the capability to detect, troubleshoot, and proactively manage any issues emerging at this layer essentially means providing the ability to sectionalize any segment in the network quickly; thus an issue can be narrowed to a specific point in the infrastructure and quickly homed in on Any issues at this layer will invariably have an impact on the higher service layer, and the specific impact (ie, which service instances have been affected) on the management infrastructure needs to be identified The IEEE 8021ag and Y1731 standards focus on this layer Transport/Data-Link Layer At the Data-Link layer, the OAM is focused on providing the capability to manage a single physical data link between two Ethernet interfaces; such links, of course, make up the network infrastructure, but the OAM capabilities on this layer are restricted to only individual physical links and include the ability to troubleshoot any issues employing loopbacks and monitor performance effectively Any impact on this layer manifests in possible issues at the higher (connectivity and service) layers, and robust capabilities to monitor, troubleshoot, and identify any issues are vital The key standard in this area, the IEEE 8023ah, focuses on the access link (first/last mile) of native Ethernet access networks Multiple transport solutions for Ethernet can be employed, such as SONET, WDM, etc, and there are well-established OAM standards for these respective solutions
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