P45691-B21 HPE Managed Switch

High-Density Rackmount InfiniBand Fabric Switch for AI/HPC Spine-Leaf Networks with the P45691-B21

The P45691-B21 is an HPE rackmount, standalone managed InfiniBand switch engineered for building low-latency, high-bandwidth fabrics in GPU and CPU clusters. With 64 front-facing 800Gb/s OSFP ports, the platform is designed to consolidate leaf or spine tiers while sustaining predictable east-west throughput for distributed training and tightly coupled HPC workloads.

Architecturally, P45691-B21 aligns with modern scale-out compute where the interconnect becomes the system backplane. Layer 2 and Layer 3 capabilities enable structured fabric segmentation, multi-tenant isolation models, and deterministic routing across pod-based topologies. The high port density supports fewer switching stages, reducing oversubscription pressure and simplifying cable management in 19-inch rack deployments. Redundant power supplies improve availability for 24/7 cluster operation, helping protect fabric stability during maintenance windows or component replacement.

Why Choose the P45691-B21?

The P45691-B21 delivers a strong density-to-performance ratio for enterprise AI/ML and HPC fabrics by combining 64 x 800Gb/s interfaces with managed L2/L3 fabric control. For architects standardising on spine/leaf designs, P45691-B21 helps scale bandwidth per rack while keeping latency-sensitive collective operations consistent, supporting growth from a single GPU pod to multi-rack clusters without redesigning the interconnect layer.

HPE designs InfiniBand platforms around serviceability, predictable operations, and data centre integration, with an engineering focus on resilient power design, controlled firmware lifecycle management, and interoperability across standard rack infrastructure. P45691-B21 fits established facility practices for power redundancy and structured cabling while targeting long-running production environments.

Key Applications:

• AI/ML scale-out training fabrics
• HPC low-latency interconnect backbones
• GPU pod spine/leaf topologies
• High-throughput east-west cluster networking
• Storage and compute cluster fabrics

At Happyware - Server Hardware you benefit from non-binding offers tailored precisely to your fabric design and rollout schedule, helping you validate P45691-B21 port planning and rack integration before procurement. For large deployments, bulk order discounts support cost-efficient standardisation on P45691-B21 across pods, spines, or leaf tiers.