netsim-tools release 1.2.0 adds full-blown MPLS and MPLS/VPN support:
- VRF definitions and layer-3 VRFs
- VRF-aware OSPF, IS-IS and BGP
- Traditional MPLS with LDP (SR-MPLS was already available)
- BGP Labeled Unicast
- MPLS/VPN: VPNv4 and VPNv6 address family support
You might want to start with the VRF tutorial to see how simple it is to define VRFs, and follow the installation guide to set up your lab – if you’re semi-fluent in Linux (and don’t care about data plane quirks), the easiest option would be to run Arista cEOS.