1-101Destinations : 6 Routes : 6Destination/Mask Proto Pre Cost NextHop Interface3.3.3.3/32 Direct 0 0 127.0.0.1 InLoop05.5.5.5/32 BGP 255 0 2.2.2.9 NULL020.1.1.0/24 OSPF 10 1563 100.1.1.1 Vlan12100.1.1.0/24 Direct 0 0 100.1.1.2 Vlan12100.1.1.2/32 Direct 0 0 127.0.0.1 InLoop0120.1.1.0/24 BGP 255 0 2.2.2.9 NULL0Issuing the display ip routing-table command on the CEs, you should see that the cost of the OSPFroute to the peer CE is now 10 (the cost configured for the sham link), and that the next hop is now theVLAN interface 1 connected to the PE. This means that VPN traffic to the peer will be forwarded overthe backbone. Takes CE 1 as an example:[CE1] display ip routing-tableRouting Tables: PublicDestinations : 9 Routes : 9Destination/Mask Proto Pre Cost NextHop Interface20.1.1.0/24 Direct 0 0 20.1.1.1 Vlan1120.1.1.1/32 Direct 0 0 127.0.0.1 InLoop020.1.1.2/32 Direct 0 0 20.1.1.2 Vlan1130.1.1.0/24 OSPF 10 1574 100.1.1.2 Vlan12100.1.1.0/24 Direct 0 0 100.1.1.1 Vlan12100.1.1.1/32 Direct 0 0 127.0.0.1 InLoop0120.1.1.0/24 OSPF 10 12 100.1.1.2 Vlan12127.0.0.0/8 Direct 0 0 127.0.0.1 InLoop0127.0.0.1/32 Direct 0 0 127.0.0.1 InLoop0Issuing the display ospf sham-link command on the PEs, you should see the established sham link.Takes PE 1 as an example:[PE1] display ospf sham-linkOSPF Process 100 with Router ID 100.1.1.2Sham Link:Area RouterId Source-IP Destination-IP State Cost0.0.0.1 100.1.1.2 3.3.3.3 5.5.5.5 P-2-P 10Issuing the display ospf sham-link area command, you should see that the status of the peer is Full:[PE1] display ospf sham-link area 1OSPF Process 100 with Router ID 100.1.1.2Sham-Link: 3.3.3.3 --> 5.5.5.5Neighbour State: FullArea: 0.0.0.1Cost: 10 State: P-2-P, Type: ShamTimers: Hello 10 , Dead 40 , Retransmit 5 , Transmit Delay 1Example for Configuring BGP AS Number SubstitutionNetwork requirementsAs shown in Figure 1-27, CE 1 and CE 2 belong to VPN 1 and are connected to PE 1 and PE 2respectively. In addition, they use the same AS number 600.
