Tenant separation is real at the wire

Your tenants share one fabric and must never see each other on it. Genesis Grid enforces that in the switch and in the NIC: InfiniBand partition keys on the training fabric, per-tenant segmentation on Ethernet, and a policy surface your tenants configure themselves. The performance clause in every tenant contract you sign rests on this layer.

Capabilities

What the fabric has to get right

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RDMA for multi-node jobs: Your tenants run non-blocking, low-latency RDMA so one job spans many nodes and still behaves like a single machine. Without that, a rack is not sellable as a training cluster at all.
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InfiniBand partition keys: You separate tenants on shared InfiniBand with partition keys enforced on the fabric itself, not with a convention in a job script. Each tenant addresses its own partition and nothing else. Which enforcement points hold that line is all three: the subnet manager assigns, adapter and switch port enforce, and the mechanism is set out in full on the multi-tenancy page.
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Per-tenant network segmentation: Every tenant runs in its own addressing and policy domain. East-west traffic between tenants is denied by default rather than filtered afterwards, and your NOC reads every change in the audit log.
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SONiC on white-box switching: You buy switches on price, lead time and supply, and run open network software on Broadcom white-box hardware. What Genesis contributes upstream — platform and SAI fixes for the Broadcom white boxes we run — is the same build your fabric runs, not a private fork.
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VPP in user space: Packet processing runs in user space with VPP instead of the kernel path, so a node carries tenant traffic without spending the cores your accelerators need on overhead. The rate holds only against a stated core budget, frame size and feature set: 100 Gbit/s per node at 1500-byte frames on four cores, with per-tenant ACLs, NAT and policing.
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Tenant-facing policy and connectivity: IPv4 and IPv6, direct peering and customer-owned transit terminate in the tenant's own domain, and per-tenant stateful policy is configured in self-service. Your tenants change their perimeter in the portal instead of raising a ticket with you.
Measured, then committed

What you commit, after we measure it

The envelope depends on the fabric already in your racks, so we benchmark it under simulated multi-tenant contention before anyone signs. What enters your tenants' service level is the measured figure, never the datasheet figure.

400 Gbit/s

RDMA bandwidth per accelerator on the training fabric

100 Gbit/s

per-node tenant traffic carried in user space with VPP

48 hours

to benchmark your fabric under multi-tenant contention

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Questions your network team will ask

How are tenants separated on shared InfiniBand?
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With partition keys enforced on the fabric. Each tenant gets its own partition, and a node outside it cannot address the traffic. That mechanism surprised NVIDIA's own engineers when we showed it to them. On the Ethernet side the equivalent is per-tenant segmentation with default-deny east-west.

Can we promise bandwidth and latency on a shared fabric?
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Yes, inside a cluster, against the figure we measured on your fabric under contention and committed per deployment. Partition keys give you separation, not a bandwidth reservation, so the number comes from the measurement rather than the mechanism. What you cannot promise is one fabric spanning sites: separate sites are separate clusters, each with its own fabric.

Who runs the network day to day?
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You do. You keep the facility, the physical links and the carrier contracts, and you operate the fabric; Genesis carries escalation when the fault is in the stack. What that takes in headcount is set out on the data centres page.

Can traffic leave the jurisdiction we sold?
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Not by accident. There is no cross-site scheduling in the stack, so a workload never migrates across a border to fill a gap in demand. What leaves a site is what your tenant explicitly sends.

Before you put bandwidth in a contract
Have an architect measure your fabric
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