| Feature Area | Enhancement |
|--------------|--------------|
| Base OS | Complete transition to Linux kernel (4.x) – no longer Titanium-based. Enables faster boot times (under 2 minutes) and better resource efficiency. |
| VXLAN | Full BGP EVPN control plane support; multicast-free VXLAN; integrated routing & bridging (IRB). |
| Day-0 Automation | Built-in support for POAP (PowerOn Auto Provisioning) and Pydantic-based Python automation scripts. |
| Telemetry | gRPC Dial-out telemetry (protobuf encoding) for model-driven streaming to Kafka/Splunk. |
| Security | MACsec emulation (control-plane only in v9.3.9, data-plane simulation) + CoPP (Control Plane Policing) enhancements. |
| Troubleshooting | vsh_lc shell for debugging, enhanced ethanalyzer (local tcpdump), and SPAN to file. |
✅ CI/CD for Data Center Automation
Test Ansible/Nornir/NAPALM playbooks against a virtual fabric before physical deployment.
✅ VXLAN EVPN Lab
Build multi-tenant overlay networks across 3+ virtual switches without physical hardware. nexus9300v939qcow2 new
✅ Cisco CML / EVE-NG Topologies
Replace older Nexus 9000v images (7.x, 9.2.x) for modern NX-OS features like segment routing (SR-MPLS) emulation.
✅ Network Security Training
Simulate CoPP, ACLs, and role-based CLI access without risking production gear. Critical flag : Use bus=ide for the disk
The default VDC logs excessively to vdc_2 even when unused.
Workaround: Enter global config and run no logging logfile to suppress noise.
| Physical Nexus 9300 | Nexus 9300v 9.3.9 |
|---------------------|--------------------|
| Wire-rate forwarding | ~1–2 Gbps max throughput (CPU-limited) |
| 32 MB TCAM | Simulated – limited entries (use hardware access-list tcam region carefully) |
| MACsec hardware | Control-plane only (no real encryption) |
| PTP (1588) | Not supported |
| 100G/400G ports | Emulated as 10G interfaces | enhanced ethanalyzer (local tcpdump)
virt-install \
--name nexus9k-new \
--ram 12288 \
--vcpus 4 \
--disk path=/var/lib/libvirt/images/nexus9300v939qcow2_new.img,device=disk,bus=ide \
--import \
--network bridge=br-mgmt,model=e1000 \
--network bridge=br-spine,model=virtio \
--network bridge=br-leaf,model=virtio \
--graphics none \
--console pty,target_type=serial
Critical flag: Use bus=ide for the disk (some new images fail with virtio-blk). Use e1000 for mgmt0 and virtio for data plane ports for better throughput.
Before dissecting the filename, let’s establish the basics. The Cisco Nexus 9300v is a virtualized version of the hardware Nexus 9300 series switch. Unlike physical switches that cost tens of thousands of dollars, the 9300v runs as a virtual machine (VM) inside a hypervisor.
Key characteristics include: