I86bi-linux-l3-adventerprisek9-ms.155-2.t.bin — Ultra HD

"i86bi-linux-l3-adventerprisek9-ms.155-2.t.bin"

The text is the filename for a Cisco IOU (IOS on Unix) or IOL (IOS on Linux) Layer 3 image . These images are specifically compiled to run Cisco's network operating system natively as a process on a Linux-based host, making them highly efficient for network simulation in environments like GNS3 and EVE-NG . Breakdown of the Filename GNS3 VM on VMware Fusion tech preview for M1 #3261 - GitHub

Advanced Enterprise

Because this is an image, it contains nearly every feature a student could need. Unlike stripped-down "IP Base" images often found on physical hardware, this image supports: I86bi-linux-l3-adventerprisek9-ms.155-2.t.bin

Indicates this is an x86-compatible binary specifically for Linux environments. Feature Set (l3-adventerprisek9): Layer 3 (Router) "i86bi-linux-l3-adventerprisek9-ms

  1. Not for production – This image is intended for lab and learning only.
  2. Not a traditional IOS .bin – Cannot be loaded onto physical Cisco routers (ISR/ASR).
  3. L2 limitations – As an L3 image, switching features are minimal. For switch emulation, use an L2 IOL image (e.g., L2-adventerprisek9).
  4. Version 15.5(2)T – A standard release from the 15.5 Technology train, includes newer routing and security features.
  1. Download from Cisco.com under IOS Software → IOS 15.5(2)T for IOU.
  2. Upload to server (e.g., EVE-NG /opt/unetlab/addons/iol/bin/)
  3. Set permissions (EVE-NG): 
    chmod +x I86bi-linux-l3-adventerprisek9-ms.155-2.t.bin
/opt/unetlab/wrappers/unl_wrapper -a fixpermissions
  4. Generate license (Cisco IOL requires a license file iourc): 
    # Using Cisco IOL license generator (Python script)
python3 CiscoIOUKeygen.py
  5. Run in EVE-NG node type "IOL L3 Switch" or "IOL Router".

Layer 3 routing emulator

This image is a powerful, lightweight for Cisco’s 15.5T IOS release, intended for virtual lab environments. It provides enterprise-grade routing features without requiring physical hardware, making it a staple for network engineers and students. Not for production – This image is intended

I86bi - Platform: Linux x86 binary (for IOU/Dynamips) linux - Underlying OS personality l3 - L3 routing image (not switch image) adventerprisek9 - Feature set (Enterprise + crypto) ms - Modular + Secure (includes crypto support) 155-2.t - Version 15.5(2)T (T = Technology train) .bin - Binary executable

conf t hostname SW1 ip routing vlan 10,20 int vlan 10 ip address 192.168.10.1 255.255.255.0 no shut int vlan 20 ip address 192.168.20.1 255.255.255.0 no shut router ospf 1 network 192.168.10.0 0.0.0.255 area 0 network 192.168.20.0 0.0.0.255 area 0

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