To determine the path from the loopback interface on Router CE2 to the VPN interfaces on Router PE2, use the traceroute command:
user@vpn5> traceroute 192.168.193.2
source 10.255.10.5
traceroute to 192.168.193.2 (192.168.193.2) from 10.255.10.5, 30 hops max, 40 byte packets 1 vpn-08-t3003.isp-core.net (192.168.193.2) 0.852 ms 0.670 ms 0.656 ms