| 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 |
Before proceeding, it is vital to understand the legalities. cisco switch ios image download for gns3 install
Because Cisco IOS software is proprietary, GNS3 does not include any images by default. Users must provide their own through the following legitimate channels: | Issue | Likely Cause | Solution |