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| MPLSMPLS VPN OSPF Shamlink |
PE1 OSPF Sham-links to PE2 using Loopback Interface 
PE2 OSPF Sham-links to PE1 using Loopback Interface
CE2 to CE3 as a Backup Link then we must make OSPF cost higher so the route will goes via PE Sham-Links
CE3 to CE2 as a Backup Link then we must make OSPF cost higher so the route will goes via PE Sham-Links
From CE to CE routes must via PE
CE2 Traceroute to CE3 successfully via PE
CE2#traceroute 6.6.6.6
Type escape sequence to abort.
Tracing the route to 6.6.6.6
1 38.0.0.3 4 msec 4 msec 0 msec
2 23.0.0.2 [MPLS: Labels 200/24 Exp 0] 0 msec 12 msec 4 msec
3 16.0.0.1 [MPLS: Label 24 Exp 0] 4 msec 4 msec 4 msec
4 16.0.0.6 0 msec 4 msec *
CE2 Traceroute to CE1 successfully via PE
CE2#traceroute 7.7.7.7
Type escape sequence to abort.
Tracing the route to 7.7.7.7
1 38.0.0.3 4 msec 4 msec 0 msec
2 23.0.0.2 [MPLS: Labels 200/26 Exp 0] 0 msec 0 msec 0 msec
3 17.0.0.1 [MPLS: Label 26 Exp 0] 0 msec 4 msec 0 msec
4 17.0.0.7 0 msec 4 msec *
CE3 Traceroute to CE1 and CE2 successfully via PE
CE3#traceroute 6.6.6.6
Type escape sequence to abort.
Tracing the route to 6.6.6.6
1 17.0.0.1 16 msec 8 msec 4 msec
2 16.0.0.6 8 msec
CE3#traceroute 8.8.8.8
Type escape sequence to abort.
Tracing the route to 8.8.8.8
1 17.0.0.1 4 msec 0 msec 4 msec
2 12.0.0.2 [MPLS: Labels 201/22 Exp 0] 0 msec 12 msec 4 msec
3 38.0.0.3 [MPLS: Label 22 Exp 0] 8 msec 8 msec 8 msec
4 38.0.0.8 8 msec
