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Abstracting away complexity while we scale, is key there. For the last few years, the industry is moving away from complicated configurations in individual network devices, to simpler configurations in centrally managed controllers. Software vendors must offer 60-day money-back guarantees on the products. To me, this evolution is the next step in the networking layer.- Different vendors would likely require a different software implementation - Off-path SmartNICs are more programmable or flexible - Typically the same dataplane drivers (kernel, DPDK, etc) are used on host and SmartNIC - Hardware vendor or 3rd parties can provide an OS to give users control over their own destinyWhere necessary, we used a similar brand of NIC or controller that the. Development originally started with AWS as an internal project for their cloud, simplifying their network operations and making the physical network devices simpler, dumber, and easier to manage. There has been more and more talk about something called SmartNICs.
The compute layer can control the programmable ASIC that serves the network traffic and can perform specific network functions.The ASIC also provides an extra security layer between the physical network cable and the regular server OS, because there’s a programmable network device built into the NIC (instead of having that in the ToR switch).To the server OS, the SmartNIC presents virtual interfaces based on the configuration you put in. Essentially, the NIC has a compute layer on it, making it possible to run custom software on the NIC itself. SmartNIC ArchitectureBut first, let’s have a look at the architecture that makes up a SmartNIC. Most of the architecture and specifications that follow below, are from Pensando – but all SmartNICs are similar in design. SmartNICs would be able to connect to the network using regular static routing, or dynamic routing using BGP or MPLS.VMware recently announced Project Monterey, where they’re working with NVIDIA, Pensando, and Intel to bring a complete solution to the market.
By essentially punting traffic towards the SmartNIC CPU, it can redirect that traffic to a service that’s running on the NIC. If the programmable ASIC does not have a specific network function, there’s the ability to extend that layer. Virtualized Device FunctionsIn the architecture, there is a parallel layer that runs Virtualized Device Functions. The NIC will make sure the network traffic is separated going from and to servers, either using traditional VLANs or an overlay like VXLAN or Geneve. They present either vNICs or vHBAs to the OS, only SmartNIC takes it a step further with the Virtualized Device Functions in the NIC directly (and without the need for special uplink devices).When the NIC can perform the network isolation and functions, all we need in the physical network topology is reachability.
The only compatibility would be with the SmartNIC, meaning that the OS compatibility matrix should be limitless. Not in the ESXi kernel anymore, or using the bare metal agent. Instead of taking CPU cycles of the main CPU, making use of the security boundary between the SmartNIC and the OS, and have the ability to inject network services into the NIC directly, would open up a lot of use cases.NSX would run in the NIC and no longer the server OS. Still, running those services on the SmartNIC CPU, instead of forwarding the traffic to the server OS, should still be quicker (time will tell).Imagine VMware NSX Data Center running on these SmartNICs.
Here’s a small glance of what they can do: For example, Pensando has two cards: the DSC-25 and DSC-100. SmartNICs are no exception. PerformanceWe’re going fast everywhere these days. The network traffic vSAN generates can be wildly different from environment to environment, but it can definitely be chatty.1) It’s a distributed storage system, so everything gets replicated at least once to another server, 2) with HCI Mesh, remote clusters can use each other’s storage.There should be no doubt that skipping the OS for these remote storage actions, will improve performance.Built-in features around remote storage (like NVMe over TCP) also allows you to present a vHBA to the server OS, just like Cisco UCS. So, not only would VMware NSX be able to run on the SmartNIC, but also VMware vSAN.
😉 ObservabilityGood visibility and monitoring are key for a decentralized network it’s harder to know exactly what’s going on when you can’t just log into a single device and do a packet capture. While drawing a max of 36W of power.These numbers are ridiculous, and I can’t wait to get my hands on some of these to test these theories. DSC-100 has 2x 100Gbit interfaces, can forward 100Gb/s L4 stateful traffic, do 40M PPS unidirectional, and hold 2M routes. All while only drawing 20W of power.
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