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)
!
! Map RoCEv2 traffic (DSCP 24 = CS3) to priority 3
qos map dscp-cos ROCE-DSCP-MAP
  dscp 24 cos 3
!
! Enable PFC on priority 3 (no-drop = lossless)
interface Ethernet1/1
  qos map dscp-cos ROCE-DSCP-MAP
  priority-flow-control mode on
  priority-flow-control priority 3 no-drop
!
! ETS: guarantee 70% bandwidth to RoCEv2 priority
qos scheduler-group AI-FABRIC
  wrr cos 3 weight 70           ! 70% for RoCEv2 (priority 3)
  wrr cos 0 weight 30           ! 30% for best-effort
!
! DCBX: auto-negotiate PFC/ETS with GPU servers
interface Ethernet1/1
  dcbx enable
  dcbx version ieee
!
! Verification:
show priority-flow-control interface Ethernet1/1
show dcbx interface Ethernet1/1
show qos scheduler-group AI-FABRIC

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
!
router bgp 65001
  address-family l2vpn evpn
    ! Restrict which VNIs are advertised to DCI peers
    neighbor 10.200.0.1 route-map TENANT-EXPORT out
  exit-address-family
!
route-map TENANT-EXPORT permit 10
  ! Only export production VNIs (10100-10199) to DCI
  match evpn vni 10100-10199
!
route-map TENANT-EXPORT deny 20
  ! Block dev/test VNIs from DCI
!

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
• Contacter IP Infusion

IP Infusion Product Team