The "i86" in the filename indicates it is built for x86-based Linux systems. Technical Breakdown of the Image Name
You must obtain a legal license from Cisco (usually via VIRL/CML subscription). i86bi-linux-l2-adventerprisek9-15.2d.bin
Unlike standard IOS images built for specialized hardware (MIPS or PowerPC processors), IOL/IOU images run as standard user-space programs on Linux. This allows them to utilize the host CPU directly, resulting in highly efficient memory and processing consumption. Technical Features and Capabilities The "i86" in the filename indicates it is
This is not a router image. If you try to configure ip routing or router ospf , the CLI will reject those commands. the CLI will reject those commands.