netlab release 1.5.0 includes features that will help you start very large lab topologies (someone managed to run over 90 Mikrotik routers on a 24-core server):

• You can start libvirt virtual machines in batches to reduce the CPU overload that causes startup failures on large topologies.
• You can combine virtual machines and containers in the same lab, further reducing the memory footprint for devices available as true containers (Linux hosts, Cumulus/FRR routers, Arista cEOS)
• Use custom management network IP subnet if you’re running out of management IP addresses

To get more details and learn about additional features included in release 1.5.0, read the release notes. To upgrade, execute pip3 install --upgrade networklab.

New to netlab? Start with the Getting Started document and the installation guide.