OcNOS 6.6 for Data Centers: AI Fabric PFC/ETS, EVPN Policy Enhancements, and 400G Upgrade

OcNOS 6.6 for Data Centers is now generally available. This release initiates the AI fabric journey — PFC and ETS arrive in OcNOS 6.6, providing the lossless RoCEv2 transport foundations that GPU clusters require. Full Tomahawk 5-based 800G AI fabric support completes in OcNOS 6.6.1 and 7.0. For existing EVPN-VXLAN deployments, OcNOS 6.6 delivers meaningful policy and visibility improvements.

AI Fabric: PFC and ETS for RoCEv2

OcNOS 6.6 DC introduces PFC (Priority-Based Flow Control) and ETS (Enhanced Transmission Selection) on supported Broadcom platforms. These are the two essential building blocks for lossless Ethernet required by RoCEv2 GPU-to-GPU communication in AI training fabrics.

! OcNOS 6.6 DC -- PFC and ETS for RoCEv2 (AI fabric)
!
configure terminal
qos enable
qos statistics
!
! Map RoCEv2 traffic (DSCP 24 = CS3) to traffic-class 3
qos profile dscp-to-queue ROCE-DSCP-MAP
  dscp 24 queue 3
  exit
!
! Bandwidth guarantee: 70% to the RoCEv2 queue, 30% to best-effort
policy-map type queuing default AI-FABRIC
  class type queuing default q3
    bandwidth percent 70
    exit
  class type queuing default q0
    bandwidth percent 30
    exit
  exit
!
! Apply the map and the scheduler, and enable PFC on the port
interface ethernet1/1
  qos map-profile dscp-to-queue ROCE-DSCP-MAP
  service-policy type queuing output AI-FABRIC
  priority-flow-control mode on
  priority-flow-control advertise-local-config
  priority-flow-control enable priority 3
  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 qos

EVPN Policy Enhancements

OcNOS 6.6 DC expands EVPN policy capabilities with enhanced route-map enforcement for EVPN route advertisement. Operators gain fine-grained control over which routes are imported, exported, and shared across VNIs — improving security boundaries and control-plane efficiency in large multi-tenant VXLAN fabrics.

! OcNOS 6.6 DC -- EVPN route-map for tenant isolation
!
configure terminal
!
router bgp 65001
  address-family l2vpn evpn
    ! Restrict what is advertised to DCI peers
    neighbor 10.200.0.1 route-map TENANT-EXPORT out
    exit-address-family
  exit
!
ip extcommunity-list PROD-RT permit rt 65001:10100
!
route-map TENANT-EXPORT permit 10
  match extcommunity PROD-RT
  exit
!
route-map TENANT-EXPORT deny 20
  exit
!
commit
exit
!
show bgp l2vpn evpn summary

Edgecore AS5916-54XL (QMX) Platform

OcNOS 6.6 DC introduces the Edgecore AS5916-54XL on Broadcom QMX silicon — a 48×10G + 6×100G carrier-grade aggregation switch that bridges SP and DC use cases. This platform is designed for operators who need a single device to handle both aggregation routing and data center top-of-rack roles.

• OcNOS 6.6 for Service Providers
• OcNOS 6.6 Release Overview
• OcNOS 6.6.1: Full AI Fabric on Tomahawk 5
• OcNOS-DC Product Page
• IP Infusion kontaktieren

IP Infusion Product Team