OcNOS 6.6.1 is now generally available. This release delivers the complete AI fabric solution on Broadcom Tomahawk 5-based open hardware — building on the PFC and ETS foundations introduced in OcNOS 6.6 to provide a production-ready lossless RoCEv2 fabric for AI GPU clusters. Service provider deployments benefit from additional Segment Routing enhancements and expanded EVPN coverage.
Complete AI Fabric on Broadcom Tomahawk 5
OcNOS 6.6.1 DC delivers full lossless AI fabric support on Tomahawk 5 platforms including the UfiSpace S9321-64EO (64×800G OSFP, 51.2 Tbps). This includes Priority-Based Flow Control (PFC), Enhanced Transmission Selection (ETS), DCBX auto-negotiation, Explicit Congestion Notification (ECN), and RDMA-aware queue management — all validated for production RoCEv2 GPU workloads.
| 能力 | OcNOS 6.6 | OcNOS 6.6.1 |
|---|---|---|
| PFC (Priority-Based Flow Control) | Initial (select platforms) | ✓ Full TH5 support |
| ETS (bandwidth allocation) | Initial | ✓ Full TH5 support |
| DCBX auto-negotiation | Partial | ✓ IEEE and CEE modes |
| ECN (congestion notification) | No | ✓ Full ECN marking |
| 800G platform (TH5) | No | ✓ UfiSpace S9321-64EO |
| RoCEv2 queue profiles | No | ✓ Pre-validated profiles |
! OcNOS 6.6.1 DC -- AI fabric configuration
!
configure terminal
qos enable
qos statistics
!
! Step 1: DSCP to traffic-class mapping for RoCEv2 and control traffic
qos profile dscp-to-queue AI-FABRIC-MAP
dscp 24 queue 3 ! RoCEv2 (CS3) -> traffic-class 3
dscp 46 queue 5 ! Expedited (EF) -> traffic-class 5
exit
!
! Step 2: bandwidth guarantees per traffic class
policy-map type queuing default AI-SCHEDULER
class type queuing default q5
bandwidth percent 10 ! routing and signaling
exit
class type queuing default q3
bandwidth percent 70 ! RoCEv2 (GPU all-reduce)
exit
class type queuing default q0
bandwidth percent 20 ! best-effort
exit
exit
!
! Step 3: apply to the fabric port and enable lossless PFC
interface ethernet1/1
qos map-profile dscp-to-queue AI-FABRIC-MAP
service-policy type queuing output AI-SCHEDULER
priority-flow-control mode on
priority-flow-control advertise-local-config
priority-flow-control enable priority 3 5
exit
!
commit
exit
!
! Verification:
show priority-flow-control details all
show priority-flow-control statistics all
show dcbx details interface ethernet1/1
show running-config qosSegment Routing Enhancements (SP)
OcNOS 6.6.1 SP expands Segment Routing capabilities with additional Flex-Algo improvements including refined delay advertisement thresholds, improved algorithm convergence during topology changes, and enhanced SR-TE policy path computation. The RSVP Auto-Bypass feature is also introduced in this release — see the RSVP Auto Bypass guide 了解詳情。
EVPN Service Expansion
OcNOS 6.6.1 expands EVPN coverage with improvements to EVPN-ETREE service handling, enhanced multi-homed ESI mass withdrawal timing, and improved EVPN IRB (Integrated Routing and Bridging) gateway performance for data center environments requiring simultaneous L2 and L3 forwarding within the same VNI.
IP Infusion Product Team
深入了解，隨身帶走。
兩份簡明的技術下載資料，內容比本頁更為深入：完整的 OcNOS-SP 規格書與完整的 OcNOS-DC 規格書。