demo : Likely indicates a trial or demonstration license/mode.

sat bathed in the blue glow of four monitors. He wasn't building a physical bridge; he was architecting a virtual one. On his screen sat a single, cryptic file: iosxrv-k9-demo-6.1.3.qcow2 This file was a "demo" image of Cisco’s IOS XRv

Ensure the host has allocated at least 2 to 4 vCPUs. If top shows one core at 100% and others at 0%, there may be an affinity or configuration issue.

/opt/unetlab/wrappers/unl_wrapper -a fixpermissions

This is not a router simulation; it is a .

Add the .qcow2 as the boot drive.