Cisco Cisco ONS 15454 M2 Multiservice Transport Platform (MSTP) Hoja De Datos

 

 

© 2011

–2013 Cisco and/or its affiliates. All rights reserved. This document is Cisco Public. 

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the network. The distributed computation model reduces DCN bottlenecks, because the exchange of GMPLS 

information to compute optical impairments is between adjacent network elements supporting the optical path, with 

final decision taking place at the egress node. This approach avoids an accumulation of information on the links 

and nodes and being sent to the central server. The Cisco DWDM control plane provides the following services 

and benefits: 

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Automatic DWDM network topology discovery 

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Automatic wavelength provisioning, including IP over DWDM (IPoDWDM) interoperability with GMPLS-UNI 

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Automatic path computation with awareness and validation of optical impairments and interface properties 

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Optical channel diversity based on LSP-ID and nodes, links, and Shared Risk Link Groups (SRLG)  

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Restoration  

The DWDM-aware control plane becomes crucial when deploying IPoDWDM networks, because it provides unique 

operational advantages and efficiency, making bandwidth-on-demand available to high-end IP networks, along with 

optical restoration as needed and network and resource status. GMPLS UNI enables routers to dynamically 

achieve LSP set-up, LSP tear down, diverse LSP request over UNI, as well as DWDM equipment to achieve 

wavelength change on client DWDM interfaces. 

Standards 

The GMPLS optical control plane has been promoted by the IETF as an extension to the MPLS data control plane 

(RFC 3945-GMPLS). Now the IETF Common Control and Measurement Plane (CCAMP) working group is leading 

the WSON standardization effort, in conjunction with the ITU-T. IETF CCAMP and the ITU-T SG-15 joint liaison are 

taking advantage of existing ITU-T standards work, such as G.680 and G.698.x, to advance the IETF Optical 

Control Plane project. 

The CCAMP working group is taking a two-step approach to the Control Plane for DWDM networks. First, it is 

dealing with the pure routing and wavelength assignment (RWA) problem, which includes wavelength connectivity 

and interface signal compatibility. 

Routing and Wavelength Assignment Standards  

The relevant standards (or ongoing drafts) include: 

● 

RFC 6205 Generalized Labels for Lambda-Switch-Capable (LSC) Label Switching Routers: This 

standard defines an appropriate label format when GMPLS controls WSON networks. 

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Switched Optical Networks (WSONs): This standard defines the context, terminology, and architectural 

options for a GMPLS control plane applied to WSON networks. As a framework, this is an informational 

document and does not define any protocol extensions.  

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These drafts are working group documents, and they are the basis for WSON protocol extensions. 

Currently there are several ongoing discussions about information encoding. The ultimate solution is 

likely to differ from the current draft content. 

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