Network traffic is exploding. Network operators want to evolve their networks while keeping their services running. Performance SDN lets you augment your existing network edge with SDN capabilities such as per subscriber traffic management or application controlled flow based forwarding at internet scale.
Drivers and challenges
Historically network architectures have focused on aggregating multiple customer connections effectively, and transporting the traffic upstream through the core of the network to content and service providers. The core links have always been very costly, which provided the incentive for the operators to try to keep as much traffic as possible confined to the network point of presence or a network exchange point. But Content Delivery Networks, Cloud Service Providers, and the proliferation of direct peering have shifted the traffic patterns to be more East-West, taking customer traffic directly to peer or content providers within the same location. What used to be 50% of traffic is now 75% that never has to go over the backbone. This is resulting in edge routers being overburdened with traffic that is not destined upstream to the core network.
At the same time, network operators face the challenge of introducing more dynamic on-demand capabilities to their networks in order to enable easier software and application integration. They face the need to evolve their networks to be more dynamic, with capabilities for software integration, DevOps and SDN, while transporting large volumes of data between their customers, peers and content providers. They continually face challenges trying to balance those needs.
Offload the core with SDN Edge router enhancement
Corsa’s Edge Router Offload solution allows network operators to transparently introduce an SDN capable platform without modifying their routing topology or requiring a forklift upgrade. They add the capability of switching customer to peer (East-West) traffic directly without forwarding it up to the Edge Router. This type of offload allows service providers to manage their CAPEX spend more efficiently by augmenting the edge router capacity without further investment in big chassis and software licensing.
Introducing Corsa’s SDN Switching and Routing platform as a router enhancement also adds new capabilities for SDN based forwarding without any changes to the current routing infrastructure. This allows network operators to evolve their networks seamlessly, without having to “fork lift” current infrastructure to replace it with new SDN capable equipment. This seamless evolution allows them to gradually build and introduce new innovative services, such as bandwidth on demand, or application specific routing. This creates additional value for their end customers, and new service revenue streams for their organizations.
These new services are enabled by open programmatic SDN control by the orchestration layer, which can manage them in a fully automated way in concert with existing OSS/BSS systems.
Features of Corsa’s edge router offload solution
Corsa DP2000 Switching and Routing platform can be introduced as a transparent L2 device that terminates access connections for the customers and peers. This can be done in a completely transparent way without any changes to routing topology. The addition of the Router Enhancement SDN controller, would allow learning of routing topology from the existing router, and therefore would allow software control over routing decisions. If it is determined that particular traffic flow should be forwarded directly without it being forwarded upstream to the router, Router Enhancement SDN controller will program appropriate forwarding instructions via an open programmable interface to the forwarding hardware.
These forwarding decisions are no longer limited by routing protocol constraints, but instead can be driven by any policy that the network operator chooses to implement. Also the granularity of these forwarding decisions is no longer limited by the granularity of the routing information, but instead can be done on a per flow basis, enabling application specific routing topologies.
The DP2000 series provides a complete lineup of products that range from the 100Gbps throughput DP2100 device that is ideal for smaller points of presence, to multi-terabit stacked systems that can provide sufficient performance for even the largest network locations. The stacked hardware data planes produce a single logical switch or router. The optics for the stacking port are built into the hardware, so the incremental cost to add more devices to the stack is just the cost of a short multimode ribbon cable. All the functionality is common for all the products, without any limitations or requirements to activate features or performance via a license upgrade. This means that any SDN driven service can be deployed at any location regardless of size or traffic profile. It also ensures that the network can easily scale in the future without requiring any changes to the software that controls it.
Corsa DP2000 line rate forwarding performance at any speed up to 100G coupled with deep memory buffers and advanced traffic management capabilities, such as traffic shaping, ensures that network performance is not compromised with the introduction of the new network node. The DP2000 platform was designed and built with WAN applications in mind and is ideally suited for deployments either at the provider edge or customer edge. Via an open, programmable interface, Corsa’s advanced traffic management and QoS features control and shape the traffic to required rates.
Corsa’s Edge Router offload solution gives network operators a complete range of choices for introducing SDN capabilities into their network. With complete open programmable control of all the features, line rate performance coupled with deep buffers, full scalability from 100G to 2400G on the same platform, and seamless integration into the current network, it is an ideal solution for WAN and metro-edge networks.