FEATURE SOFTWARE-DEFINED NETWORKING
world. Multilayer provisioning uses real-time multilayer path computation and soſtware control to rapidly create cost-effective paths for new Ethernet, Fibre Channel, video, time-division multiplexed and other service connections, without human intervention. Tis increases customer responsiveness and reduces operations expenses. Even more, multilayer provisioning enables
new services and revenue streams, oſten based on variations of bandwidth on demand. One example is a dynamic data centre interconnect (DCI) service. While data centres already have fixed links among themselves, they oſten require immediate short-term, high-bandwidth connection for applications like cloud bursting, unplanned backups, or data and virtual machine migration. Data centres subscribing to a dynamic DCI service would have a basic connection to a service provider network. Using dynamic DCI, these data centres would be able to obtain any-to-any short-term, high- bandwidth connections among themselves, and essentially only pay for the bandwidth that they use and when they use it. Tis would supplement their fixed connections and provide them with redundancy in the event of failures.
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Another service can be termed dynamic
SD-WAN. Soſtware defined WANs provide enterprises with optimised cost-performance WANs by combining non-deterministic but less expensive broadband networking with deterministic but more expensive MPLS VPNs. A limitation of SD-WANs today is these can only optimise existing broadband and MPLS services, and cannot adapt to short term needs or gracefully evolve as traffic conditions change. A dynamic SD-WAN service would be able to modify bandwidth of the underlying services dynamically, to provide an even more effective enterprise WAN experience. Taking this a step further, when SDN-based
multilayer provisioning is combined with another important modernisation initiative, network functions virtualisation, we are on a firm footing to achieve Network-as-a-Service. Tis is the cloud vision and holy grail of extending to end users an ability to dynamically ‘dial up’ all manner of network services, and have them available in minutes.
Summary Te current approach of managing packet and optical transport networks is based on the
@fibresystemsmag |
www.fibre-systems.com
historical parallel evolution of these networks. Now that data traffic is dominant it is time to bring them together into an optimised multilayer framework, enabled through centralised SDN intelligence and control. Multilayer optimisation and multilayer restoration provides significant capital expenditure savings. Multilayer provisioning can create a cloud-like services experience. It speeds up service delivery, saves on operations expense through streamlining and automation, and above all enables new classes of bandwidth services and revenue streams.l
Jonathan Homa is senior director portfolio marketing at ECI Telecom
References
1 Multi-Layer Capacity Planning for IP-Optical Networks, Gerstel et al, IEEE Communications Magazine, January 2014
2 Multi-layer Restoration - The Impact on the Optical Layer, Matthias Gunkel, 2014 Optical Society America
3 Survivable IP/MPLS-Over-WSON Multilayer Network Optimization. M. Ruiz et al, O. Pedrola, L. Aug 2011/J. OPT. COMMUN. NETW.
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