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Recommendations Summary

Follow best practice recommendations:

  • A minimum of 4 spines in each fabric is suggested.
  • Follow a rail-optimized fabric and maintain a 1:1 relation with bandwidth subscription and Leaf to GPU symmetry.
  • Implement Dynamic Load Balancing (DLB) instead of traditional ECMP for optimal load distribution.
  • Implement DCQCN (PFC and ECN) to ensure a lossless fabric in the GPU Backend Fabric, and possibly in the Storage Backend Fabric as required per vendor recommendation.
  • Use BGP unnumbered auto-discovery between the leaf and spines nodes.
  • Use SLAAC to configure the servers IPv6 addresses.
  • Implement BGP Deterministic Path Forwarding (DPF) and RDMA-aware Load Balancing (RLB).
  • The recommended Junos OS releases for this JVD is: Junos OS Release 23.4X100-D41.2-EVO for the Juniper QFX5240-64CD.

The Juniper hardware listed in the Juniper Hardware and Software Components section are the most suitable switch platforms for the features, performance, and the roles specified in this JVD.