To determine the path from Router CE2 to Router CE1, use the traceroute command:
user@vpn5> traceroute 10.255.10.4 source
10.255.10.5
traceroute to 10.255.10.4 (10.255.10.4) from 10.255.10.5, 30 hops max, 40 byte packets
1 vpn-08-t3-003.isp-core.net (192.168.193.2) 0.686 ms 0.519 ms 0.548 ms
2 vpn1-so-100.isp-core.net (192.168.192.100) 0.918 ms 0.869 ms 0.859 ms
MPLS Label=100021 CoS=0 TTL=1 S=1
3 vpn4.isp-core.net (10.255.10.4) 0.878 ms 0.760 ms 0.739 ms