To determine the path from Router CE1’s loopback interface to Router CE2’s directly connected interface, use the traceroute command:
user@vpn4> traceroute 192.168.193.5
source 10.255.10.4
traceroute to 192.168.193.5 (192.168.193.5) from 10.255.10.4, 30 hops max, 40 byte packets
1 vpn1-fe-110.isp-core.net (192.168.192.1) 0.669 ms 0.508 ms 0.457 ms
2 vpn2-t3-001.isp-core.net (192.168.192.110) 0.851 ms 0.769 ms 0.750 ms
MPLS Label=100000 CoS=0 TTL=1 S=1
3 vpn5-t3-003.isp-core.net (192.168.193.5) 0.829 ms 0.838 ms 0.731 ms