Network engineers, Cisco Certified Internetwork Expert (CCIE) candidates, and simulation enthusiasts frequently encounter specific filenames when building virtual labs. One of the most famous and widely utilized filenames in the virtualization community is (often formatted with slight variations like i86bi_linuxl3-adventerprisek9-m2.157.3.may2018.bin or similar release dates).
Could not start IOU: [Errno 2] No such file or directory: 'i86bi_LinuxL3-AdvEnterpriseK9-M2_157_3_May_2018.bin' 32-bit binary support is probably not installed. Use code with caution. Deploying the Dependencies
MPLS, RSVP, Quality of Service (QoS), and Multicast. i86bi linuxl3-adventerprisek9-m2 157 3 may 2018.bin
Traditional and modern wide-metric deployments.
Specifies the Cisco IOS version—in this case, IOS 15.7(3)M . The "M" train represents a Mainline release, prioritizing long-term stability and a mature feature set. Use code with caution
This image is copyright Cisco Systems. It cannot be legally redistributed without permission. Common sources include:
Compared to heavy virtual machines like Cisco CSR1000v or Catalyst 8000v (which require 3GB to 4GB of RAM per instance ), this IOL image runs comfortably on as little as 256MB to 512MB of RAM per node. You can boot dozens of routers simultaneously on a modest laptop or standard desktop PC. Specifies the Cisco IOS version—in this case, IOS 15
To use this image, you typically need to follow specific setup steps for your chosen platform:
| Component | Meaning | | :--- | :--- | | | Architecture: Intel x86 (32-bit) Binary. This runs on standard x86 CPUs, not Cisco’s proprietary hardware. | | linuxl3 | Host OS & Function: Runs on Linux and provides Layer 3 routing features. (Contrast with linuxl2 for switching). | | adventerprisek9 | Feature Set: Advanced Enterprise with K9 (Cryptographic support for VPNs, SSH, IPSec). | | m2 | Platform/Driver Set: Typically indicates a modular image or specific virtual driver interface for IOL. | | 157-3.may.2018 | Version: IOS version 15.7(3), compiled in May 2018. | | .bin | Binary executable – the raw machine code image. |
As a dedicated Layer 3 image, it does not reliably support switching functions (like Spanning Tree Protocol, EtherChannels, or VLAN trunking). For Layer 2 scenarios, network engineers pair this image with a corresponding Layer 2 IOL image (such as an i86bi-linuxl2-... binary).
It typically runs with 256–512 MB RAM assigned in the hypervisor.