Since actual 2960 images often fail to run, use these alternatives to practice CCNA/CCNP switching:
If you own a physical 2960 switch, you can technically back up the .bin image file from the flash memory to a TFTP server. However, this physical image still likely won't boot in GNS3 due to the hardware emulation limits.
Cisco IOS images are copyrighted, you need a CCO log on to the Cisco website (free) and a contract to download them. Spiceworks Community Working with the Software Images - Cisco Cisco 2960 Switch Ios Image Download For Gns3
Switch# vlan database Switch(vlan)# vlan 100 Switch(vlan)# exit Switch# configure terminal Switch(config)# interface gigabitethernet 0/1 Switch(config-if)# switchport mode access Switch(config-if)# switchport access vlan 100
To successfully run a Cisco 2960 switch in GNS3, you need the following setup: Since actual 2960 images often fail to run,
If you get % Invalid input detected at '^' marker on switchport , you have a router image, not a switch image.
| IOS Filename | Description | GNS3 Requirement | RAM | | :--- | :--- | :--- | :--- | | | The Gold Standard. Supports VLANs, STP, Portfast. | IOL / QEMU | 128 MB | | c2960-lanbase-mz.122-55.SE7.bin | Older (12.2). Less memory, but lacks ip routing options. | QEMU (legacy) | 96 MB | | c2960s-universalk9-mz.150-2.SE.bin | 2960-S series. More features (Private VLANs). | QEMU (needs tuning) | 256 MB | Spiceworks Community Working with the Software Images -
Because GNS3 and Dynamips emulate general hardware, they cannot perfectly emulate the ASIC hardware found inside a physical Cisco 2960 switch. Therefore, you cannot simply take an IOS image from a physical 2960 switch and boot it in a standard router node in GNS3—it will fail because the image looks for hardware ASICs that do not exist in the emulator.
Where to get Cisco IOS files for GNS3. - Spiceworks Community