This lab is a very simple setup with two different ISP ASNs connecting to each other and exchanging VPNv4 routes over an MP-BGP session. To retain the VPNv4 prefixes the no bgp default route-target filter command has been configured on each ASBR. This method of inter-AS operation between MPLS providers is commonly referred to as Option B. A cheat sheet on the different MPLS options can be found here.
> GNS3: 10 x 3725s
> EVE-NG: 10 x IOS-XE 16.6.5s