Cisco Iou L3 - Gns3 -
Breathing New Life into Old Labs: A Deep Dive into Cisco IOU L3 on GNS3
If you have been in the networking simulation space for more than a few years, you remember the "dark ages" of slow QEMU images and the constant fight for RAM. Then came , and it changed everything. Cisco IOU L3 - GNS3
In GNS3, go to Edit > Preferences > QEMU & IOU > IOU Devices . Click New . Breathing New Life into Old Labs: A Deep
Even in 2026, with EVE-NG and CML dominating the conversation, the classic combination remains one of the most efficient ways to build large-scale Layer 3 topologies on a laptop. Click New
If you are studying for the and focusing on advanced routing (OSPF, EIGRP, BGP) or MPLS , IOU L3 on GNS3 is still the gold standard for performance.
Use it as a learning tool, respect software licensing, and upgrade to CML images when you need 100% feature parity with modern hardware. Do you still use IOU in your labs? Or have you switched entirely to EVE-NG? Let me know in the comments below!