The simplest strategy may be to disable protection at the higher layers.
Perhaps most important of all, the EoWDM approach provides definitive service control,
OAM visibility, and protection features, as there is an actual optical networking layer
per say. Here, the adoption of intelligent control plane standards (see ???Optical Network
Control???) in advanced third-generation DWDM networks will notably accelerate EPL
delivery and automation. Meanwhile the availability of carrier-grade DWDM OAM capabilities
(proprietary or OTN-based) will ensure mission-critical EPL support. Carefully
note, however, that emerging Ethernet OAM standards will inevitably have functional
overlaps with DWDM OAM (see ???Network & Services Management???), and this will
complicate carrier OSS integration. In many cases, large carriers may prefer to use
service-agnostic OTN OAM capabilities for the DWDM layer and run Ethernet service
OAM via higher level OSS tools, as shown previously in Figure 8.7. Hence, an EPL
lightpath will appear as a virtual link between two EDD entities. Either way, EoWDM
is well-suited for implementing highly stringent large granularity EPL services across
MAN/WAN domains (???Section 8.
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