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BACK-TO-BACK (B2B) PROTECTION AND DYNAMIC PROVISIONING OF PROTECTION IN OPTICAL NETWORKS

IP.com Disclosure Number: IPCOM000241791D
Publication Date: 2015-Jun-01
Document File: 16 page(s) / 1M

Publishing Venue

The IP.com Prior Art Database

Abstract

Back-to-Back (B2B) protection and dynamic provisioning of protection in optical networks are described. The dynamic provisioning proactively takes into account the dynamic needs of each area/zone in a path and provides protection to the service(s) going through that area/zone. For the dynamic provisioning, each node and link pair is assigned a danger index or risk category. The danger index or risk category is flooded in the network, via the control plane, and/or relayed to a Software Defined Networking (SDN) Path Computation Engine (PCE) Engine. The control plane or PCE uses this information for both existing and new connections. The dynamic provisioning provides automatic provisioning/de-provisioning of protection across an area/zone based on prior knowledge or analytics, leading to better network operation and utilization. B2B Protection runs over unprotected links, and thus network operators can offer both sub-50ms protected services equivalent in behavior to 1+1 Linear Protection, and also offer unprotected services with or without mesh restoration over the same types of links (unprotected links). Specifically, B2B Protection offers a 1+1 path protected service across the network where protection is closed/pinched at multiple points along an end-to-end route of the service (in addition to the mandatory closing/pinching at the endpoints). There is no need to deploy some links as 1+1 Linear Protected for premium quality services and some links as unprotected for lesser quality services.

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BACK-TO-BACK (B2B) PROTECTION AND DYNAMIC PROVISIONING OF PROTECTION IN OPTICAL NETWORKS

ABSTRACT


[0001]Back-to-Back (B2B) protection and dynamic provisioning of protection in optical networks are described. The dynamic provisioning proactively takes into account the dynamic needs of each area/zone in a path and provides protection to the service(s) going through that area/zone. For the dynamic provisioning, each node and link pair is assigned a danger index or risk category. The danger index or risk category is flooded in the network, via the control plane, and/or relayed to a Software Defined Networking (SDN) Path Computation Engine (PCE) Engine. The control plane or PCE uses this information for both existing and new connections. The dynamic provisioning provides automatic provisioning/de-provisioning of protection across an area/zone based on prior knowledge or analytics, leading to better network operation and utilization. B2B Protection runs over unprotected links, and thus network operators can offer both sub-50ms protected services equivalent in behavior to 1+1 Linear Protection, and also offer unprotected services with or without mesh restoration over the same types of links (unprotected links). Specifically, B2B Protection offers a 1+1 path protected service across the network where protection is closed/pinched at multiple points along an end-to-end route of the service (in addition to the mandatory closing/pinching at the endpoints). There is no need to deploy some links as 1+1 Linear Protected for premium quality services and some links as unprotected for lesser quality services.

BACKGROUND


[0002]Optical networks are deployed with various forms or schemes of protection such as, without limitation, ring (e.g., Bidirectional Line Switched Ring (BLSR), Unidirectional Line Switched Ring (UPSR), Virtual Line Switched Ring (VLSR), Multiplex Section-Shared Protection Ring (MS-SPRING), etc.), mesh, linear (e.g., Automatic Protection Switching (APS), linear 1+1, linear 1:1, linear 1:N, Subnetwork Connection Protection (SNCP), etc.), and the like. A network service may require different levels of protection in a spatiotemporal domain, i.e., different schemes of protection may be available in different areas or zones and at different points in time such as due to natural disasters or management activities. There can be a set of nodes (zone) which do not require any protection; some may require APS protection, or VLSR protection or path protection at different times. If a user configures a service, the user would want the service to be routed and configured taking into account the protection requirement of the respective zone/area. Conventionally, the form or scheme of protection is static in optical networks. However, static protection may not be required at all times and or points throughout the path, leading to wasted bandwidth (BW) in the network. Also, some areas may not have been provisioned with protection, and a higher...