Summary
Efficiency: IOU images are extremely lightweight. Unlike VIRL/CML images which require significant RAM and CPU, you can run dozens of these "portable" instances on a standard laptop without lag.
Image Details
i86: This typically refers to Intel 86 architecture, which includes 32-bit systems (like i386) and sometimes 64-bit systems, though for 64-bit, you'd more commonly see x86_64 or amd64.
Technical Overview: Cisco IOU Layer 3 Images in Network Virtualization 1. Introduction i86bilinuxl3adventerprisek9m21573may2018bin portable
Risks & caveats
.bin files labeled with “enterprise” or “adventure” features.: Full support for IPv4 and IPv6 routing protocols including OSPF (v2/v3) MPLS Support i86bi-linux-l3-adventerprisek9-m-21
Advanced Routing: Supports complex configurations like OSPFv3, IS-IS, and Multi-Protocol BGP (MP-BGP).