Using this IOL image in is slightly different because GNS3 historically uses Dynamips for routers. However, modern GNS3 supports "IOU" (IOS on Unix) integration:
: IOL/IOU images typically require an authorization key file ( iourc ) to execute on Linux platforms. Third-party downloads rarely include legal license generation keys, leading to environment startup failures. How the Image is Used in Network Emulators i86bi-linuxl2-adventerprisek9-m-152-may-2018.bin download
Specifies the platform and operating system layer. Linux means it runs natively on a Linux system (IOL), and L2 denotes that this is a Layer 2 (Switching) image. Using this IOL image in is slightly different
Historically, IOU/IOL images were created exclusively for Cisco's internal engineering, testing, and Authorized Learning Partners. They were never intended for public distribution or retail sale. How the Image is Used in Network Emulators
Disclaimer: This article is for educational purposes only. Always comply with Cisco’s software licensing agreements. Unauthorized distribution or downloading of copyrighted IOS images is illegal.
! Configure access ports interface GigabitEthernet0/1 switchport mode access switchport access vlan 10 spanning-tree portfast