3750 Qemu emulation lacks switching ASIC. Fix: Use IOU L2 image or add a GNS3 Ethernet switch between 3750 and other devices.
| Requirement | Action | |-------------|--------| | | Cisco.com or legal backup | | GNS3 version | 2.2.x or newer | | Emulation type | Qemu + e1000 (GigabitEthernet) or IOU (FastEthernet) | | RAM | 512 MB – 1 GB | | Boot command | console=ttyS0,9600n1 bigphysarea=60000 | | Flash disk | Create qcow2 file if boot fails | Cisco 3750 Switch Ios Image Download For Gns3 UPD
If it hangs at Loading “flash:...” — you need to for Qemu. 3750 Qemu emulation lacks switching ASIC