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Using traceroute from Loopback to Loopback

To determine the path from Router CE1’s loopback interface to Router CE2’s loopback interface, use the traceroute command:

user@vpn4> traceroute 10.255.10.5 source
10.255.10.4

traceroute to 10.255.10.5 (10.255.10.5) from 10.255.10.4, 30 hops max, 40 byte packets
 1  vpn1-fe-110.isp-core.net (192.168.192.1)  0.680 ms  0.491 ms  0.456 ms
 2  vpn2-t3-001.isp-core.net (192.168.192.110)  0.857 ms  0.766 ms  0.754 ms
     MPLS Label=100005 CoS=0 TTL=1 S=1
 3  vpn5.isp-core.net (10.255.10.5)  0.825 ms  0.886 ms  0.732 ms

When you use the traceroute command to examine the path used by a Layer 3 VPN, the provider (P) routers in the service provider’s network are not displayed. As shown above, the jump from Router VPN1 to Router VPN2 is displayed as a single hop. The P router (VPN3) shown in Figure 20 is not displayed.

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