: A direct directory listing for version 15.1a is hosted on the Internet Archive GitHub Repositories
: Indicates it is an IOU (IOS on Unix/Linux) image designed for Intel x86 architecture. linux : The operating system environment it runs on.
: IOU/IOL images require an iourc license file containing a specific "hostname" and "hostid" key to boot.
i86bi-linux-l2-adventerprisek9-15.1a.bin is a Cisco IOS on Unix (IOU) image commonly used in network simulators like GNS3 and EVE-NG to emulate Layer 2 (switching) features. Common Download Locations Internet Archive
