That's a specific filename!
Have you migrated off the 3750E yet? What are you replacing them with? Let me know in the comments. c3750e-universalk9-mz.150-2.se11.bin
: Specifies the "Universal" image type, which contains all features. Access to specific features (IP Base, IP Services) is typically controlled via Software Activation Licenses That's a specific filename
Do not blindly upgrade to this image if you are still using older 12.2(x) or 15.0(1) code. The 3750E has limited flash memory (32 MB). The universalk9 image is significantly larger (~16–18 MB) compared to older ipbase images. For a stack of switches in a production
Switch# write memory
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.
: Indicates the target hardware platform, the Cisco Catalyst 3750-E series. universalk9