Cisco Cisco ONS 15454 M2 Multiservice Transport Platform (MSTP) データシート
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GMPLS UNI also enables routers to request diverse paths based on the Label Switched Path identifier
(LSP-ID). As a result, the resiliency requirements of the network are improved while the network cost is also
reduced, because there is no need to preprovision multiple paths for each router port in the DWDM network.
Control Plane Capabilities
In networks with an ASON and GMPLS control plane, establishing a connection only considers bandwidth and
whether the link is up or down. Optical layer impairments are not considered, and the optical channel is assumed to
work by design. In this case, only preplanned channels are guaranteed to work, as shown in Figure 2. GMPLS
alone is not sufficient to decide whether a proposed path is feasible in the photonic domain.
Figure 2. 40 Gbps Service with ASON and GMPLS Path Computation
The Cisco WSON was introduced to achieve dynamic service provisioning and restoration capabilities in DWDM
networks. This solution provides extensions to GMPLS that supply path computation with optical feasibility
analysis, while providing protocol interoperability with the GMPLS suite. Optical feasibility analysis and verification
require GMPLS
to be aware of physical optical impairments. Cisco’s DWDM-aware GMPLS is aware of optical
network topology, optical component functional models, node models, node configuration, and fiber characteristics,
which are all fundamental in optical channel path verification. The following crucial impairments are considered
while performing feasibility analysis:
●
Linear impairments: Optical signal-to-noise ratio (OSNR), optical power budget, chromatic dispersion (CD),
and polarization mode dispersion (PMD)