IPExpert Lab 4 was a really good lab. Inter-AS + CsC + VPN topology. There was one good part where you don't know the remote AS number and troubleshoot it to bring up a bgp session. I had one problem. There were 2 TE tunnels, running load balancing between 2 routers. And when both the tunnels were up, MPLS forwarding became chaotic. Finally i had to shut one of the tunnels to make the VPN work.
Anyway, i've decided to do IEWB Vol 2 Lab 10 again tomorrow since it has quite a lot of features.