| Missing Feature | Why it matters | | :--- | :--- | | | Cannot run router ospf , ip route , bgp , or ip routing . This is a pure switch, not a router. | | No NAT | Cannot translate IP addresses. | | No VRF | No virtual routing/forwarding instances. | | No MPLS | Cannot do MPLS switching or L3VPN. | | Limited ACLs | Only MAC ACLs or VLAN maps. No advanced L3 ACLs (requires L3 image). | | No hardware forwarding | All switching is done in software (Linux CPU). Performance is ~50-100 Mbps per interface in GNS3. |
The file is a Cisco IOU (IOS on Unix) image used primarily for network simulation and lab environments. It provides a Layer 2 (L2) switching environment that runs as a Linux process, making it highly efficient for large-scale network topologies in software like GNS3 and EVE-NG. Key Specifications Platform: IOU (IOS on Unix) for i86 (x86) Linux. i86bi_linuxl2-adventerprisek9-m_152_may_2018.bin
Because it is an IOU image (not a full VM), it consumes significantly less RAM and CPU than standard IOSv or VIRL images, allowing for dozens of switches to run simultaneously on a single laptop. Common Technical Issues | Missing Feature | Why it matters |