C3750e-universalk9-mz.150-2.se11.bin

Switch# copy tftp: flash: Address or name of remote host []? 192.168.1.50 Source filename []? c3750e-universalk9-mz.150-2.se11.bin Destination filename [c3750e-universalk9-mz.150-2.se11.bin]? Use code with caution.

: Indicates the "Universal" feature set with strong cryptographic support (K9). This single image contains all software features (IP Base, IP Services, Advanced IP Services). The active feature set is determined by Cisco software licenses (Right-To-Use or permanent keys) installed on the switch. c3750e-universalk9-mz.150-2.se11.bin

For a stack of switches in a production environment, this was catastrophic. A stack master rebooting meant a network outage of 3-5 minutes while the stack elected a new master and re-converged spanning tree. Switch# copy tftp: flash: Address or name of remote host []