: Formerly known as VIRL, a CML Personal subscription (approx. $200/year) is the most common way for students and individuals to get legal access to modern virtual images like IOSv (Router) and IOSv-L2 (Switch).
| Issue | Likely Cause | Solution | |-------|--------------|----------| | Switch boots but no interfaces | Wrong QEMU model | Use -machine type=pc | | High CPU usage | No KVM acceleration | Enable Intel VT-x/AMD-V, use -accel kvm | | Image not recognized | Incorrect file format | Ensure .bin , not .tar or extracted files | | Spanning-tree unstable | Emulation limit | Acceptable for learning, not production | cisco switch ios image download for gns3 install
| Problem | Solution | |---------|----------| | Switch stuck at boot: prompt | Wrong image type — use Etherswitch or IOSvL2 | | High CPU usage | Set the correctly in Dynamips | | No console output | Increase RAM to 256MB+ for 3725 Etherswitch | | Missing VLAN commands | You’re using a pure router image without switch module | : Formerly known as VIRL, a CML Personal