SDN can take you to places you haven't been to on your existing network, but you may want to reconsider the forwarding table.
SDN is considered to be the main way for enterprises to fully virtualize their networks, and even the main way to achieve a complete virtual data center.
One of the main benefits of all of these virtualization is scale. Without hardware limitations, the SDN environment will be able to change based on user changes, bringing the era of data connectivity anytime, anywhere.
However, if this is the case, why are there so many problems surrounding the scalability limitations of virtual network platforms?
Forwarding table limit
It turns out that although the separation of the control plane and the forwarding plane can bring many benefits, the virtual network is still limited by the forwarding table capability. The virtual network needs a forwarding table to record the MAC address and other MAC addresses needed to push the packet to its final destination. Network data. In fact, as the commands and requests from the physical layer infrastructure and the rapidly changing virtual infrastructure are flooded with forwarding tables, this challenge will continue to increase. So far, we have developed some techniques to solve this problem, such as shortest path bridging and IP packet flooding, but the question is whether the current virtual network platform can provide scalability for enterprises.
Obviously, the first solution we can think of is to improve the flow meter itself. This is the approach taken by Corsa Technology in its new OpenFlow hardware data planes (DP6420 and DP6440), which are intended for use in data center and carrier environments. The device provides native OpenFlow 1.3 support and is capable of handling multiple traffic tables and millions of traffic, enabling rapid creation of traffic meters and tens of thousands of traffic modifications per second. They also support a variety of network port configurations, including 48x10GbE, 4x40GbE, and 4x100GbE.
If tens of thousands of traffic commands become tens of millions (businesses are likely to deploy very large scale architectures)? How can you accommodate (at a reasonable cost) a lot of TCP connections and UDP traffic? In fact, these problems are beyond your reach. You should use the destination-based forwarding method currently deployed on most Layer 2 and Layer 3 network switches. Through intelligent architecture, SDN devices can be configured correctly through automatic query and API programming. The speed of the forwarding table itself is negligible. In fact, you will see a smaller forwarding table than it is now, because the controller will continuously cut back the dead links instead of overwriting the MAC address to each virtual switch.
Virtual network visibility
However, scale-out networking not only affects forwarding tables, but also visibility issues. TIlera and Procera Networks have teamed up to address DPI in scale-out virtual networks with a new SoC solution that combines the TLEncore-Gx adapter with the Procera web application visibility library. The goal here is to provide wire-speed application intelligence directly on the server's Layer 4 to Layer 7 network for deep threat monitoring, QoS management, and other functions. The system also provides up to 225,000 unique URLs per second and a 7-layer network traffic classification, which can be used to forward specific traffic to optimize the host.
No matter how you extend your virtual network, there are two facts: one is that even the most efficient resource utilization does not ensure that the software-defined architecture can scale indefinitely. At some point, the hardware will play some role, although with proper design, this hardware impact can be controlled to a minimum.
The second is that all network structures must find a way to discover and map other resources, even those outside the company's direct control. And as SDN becomes more pervasive, the need to automate these processes will increase.
In essence, virtual networks are designed to be scalable, which certainly goes far beyond physical networks. But that doesn't mean you can get unlimited resources.
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