Alexander Gribenko
VP BD Larch Networks Israel
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Making things happen.
Alexander Gribenko is the VP of Business Development at Larch Networks.
An effective professional with over 20 years of experience in the software, telecom, and broadcast industries,
he has served in key leadership roles including CTO, CPO, COO and Head of Operations.
Alexander brings deep expertise in bridging technical operations with business development to the open networking ecosystem.
Area of Expertise
Hardware Hardware-Assisted BFD - 3ms Deterministic Failure Detection
The SONiC ecosystem is rapidly expanding from the data center to the edge. However, a critical gap remains in achieving deterministic, carrier-grade failure detection required for these deployments. Pure software BFD implementations often suffer from CPU jitter and control-plane contention, making sub-10ms convergence unreliable during high-load incidents.
We have addressed this by implementing true hardware-accelerated BFD on the Marvell platforms. We developed custom firmware running on the CM3 co-processor to manage the full BFD state machine. We also integrated this machine with SONiC and want to share this architecture with the community.
This architecture overcomes the "single-interval" limitations of standard traffic generators, delivering up to 64 concurrent sessions with intervals down to 3ms. Join us to see how offloading "heartbeats" to the CM3 guarantees stability and allows SONiC to meet strict SLAs in L3 networks.
L2+ and Beyond: SONiC Hardened for Mass-Market ToR
Open-source SONiC powers hyperscale clouds, yet turning it into a box you can pull off the shelf is a very different game. Partnering with a well-known brand, we had to make community SONiC into a mass-market ToR that survives enterprise QA.
This talk tells the stories—and shares the results.
We’ll walk through the engineering trenches:
• The L2+/L3 and other gaps we had to close
• Challenges in platform support
• Productizing SONIC - what is missing
• Missing parts - what people expect and what they get.
We will show Live booth demo: real switch, real traffic.
Solving the Klish Gap: Automatic CLI Generation from YANG for SONiC
While the SONiC Management Framework has successfully unified Northbound Interfaces (REST/gNMI) using YANG models, the Industry Standard CLI (IS-CLI) remains a bottleneck. Currently, the Klish-based CLI requires developers to manually author verbose XML definitions and Python "actioners" for every new feature. This manual process is error-prone, slow, and has resulted in the CLI lagging significantly behind SONiC's actual feature set.
Larch Networks introduces a new framework for Automatic CLI Generation. By parsing SONiC OpenConfig and custom YANG models, our toolchain automatically generates the complete Klish XML tree and backend actioner logic required for a fully functional CLI.
Join us to learn how this approach ensures 100% CLI coverage for any supported YANG model, eliminates "syntax drift" between REST and CLI, and drastically reduces the development time required to bring new SONiC features to market. We will demonstrate the auto-generation pipeline and showcase complex OpenConfig models running natively in Klish without manual coding.
SONiC at the Edge: Optimizing Performance on Resource-Constrained ARM Platforms
SONiC has become the de-facto standard for data centers, but its expansion into Campus and Edge networks faces a significant barrier: hardware resources. Standard SONiC distributions are resource-intensive, designed for x86 CPUs with abundant memory. When deployed on cost-effective enterprise platforms like the Marvell AC5X (Dual-Core ARM Cortex-A55, 4GB RAM), the out-of-box experience is often unacceptable. Initial benchmarks on a 30-port AC5X device showed boot times exceeding 4 minutes and simple CLI status commands lagging by 10–15 seconds.
Larch Networks presents a guide, explanation and live demonstration of a set of optimizations to allow SONiC run on the lower end devices.
Visit the booth to see that with right optimizations, SONiC delivers acceptable performance even on low-power, cost-efficient edge silicon, with a hands on experience.
The Missing Piece of Open Networking: Meet OpenLAN Gateway
The OpenLAN community successfully created an open, multi-vendor, cloud-managed WiFi and switching solution at the edge. The remaining gap is the WAN gateway needed to complete an open WiFi+LAN+WAN stack.
OpenLAN has now launched OpenLAN Gateway (OLG): an interoperable, open-source router/firewall initiative managed through the same proven “single pane of glass,” built on open schemas and APIs to preserve innovation while avoiding vendor lock-in.
The community is working on an OLG-NOS, an open-source GNU/Linux-based NOS designed to unify diverse network functions. OLG is being designed to span a broad hardware ecosystem, from x86 platforms to embedded SystemReady ARM appliances.
Join us to learn how OLG standardizes gateway building blocks for campus, branch, and SMB networks, and to view early reference examples emerging in the OCP ecosystem, including a system based on a combination of a Switch running SONiC as the OLS NOS and the OLG NOS.
SONiC continuous integrations and testing on 150 hardware SKUs
Discuss challenges and solutions we utilized in Larch Networks to enable a sustainable continuous integration of SONIC and stable updates rollout across a large number of different hardware models
SONiC Hardening for Mass-Market. Closing the Gaps.
We’ll walk through the engineering trenches:
• The L2+/L3 and other gaps that had to be closed - STP/RSTP/MSTP, Multicast, e.t.c.
• Challenges in platform support
• Productizing SONIC - what is missing
• Missing parts - what people expect and what they get.
We will show Live demo: real switch, real traffic.
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