Confirm, then wait for the switch to reboot (~2-3 minutes).
universalk9 contains all features but requires licenses.
This version of Cisco IOS brings mature stability and advanced Layer 3 capabilities to the 3750-E platform: StackWise Plus Technology c3750e-universalk9-mz.150-2.se11.bin
Using TFTP example:
This tells us the file is RAM-resident and compressed (ZIP format). Confirm, then wait for the switch to reboot (~2-3 minutes)
You need a valid Cisco SmartNet contract or access to Cisco’s download portal. Obtain the file: c3750e-universalk9-mz.150-2.se11.bin
As of 2025, the Catalyst 3750-E series is well past its end-of-life (EOL) date. Cisco announced EOL for 3750-E hardware in 2016, with software support ending in 2020. While the c3750e-universalk9-mz.150-2.se11.bin image remains functional, you should consider migration to modern platforms like: You need a valid Cisco SmartNet contract or
| Problem | Likely cause | Fix | | :--- | :--- | :--- | | Boot loop | Bad image or corrupt flash | Boot from ROMmon (Press Mode button during boot), then flash_init , copy xmodem: | | "Not enough memory" | Insufficient DRAM | Upgrade DRAM to 512 MB or use a lighter image (if available) | | License missing | No IP Services license | license right-to-use activate ipservices eval (temp) | | Switch not booting new image | Boot statement missing | Interrupt boot (Ctrl+Break), set BOOT=flash:/image.bin |